🔥(frontend) drop unused vendored ConnectionObserver

The vendored ConnectionObserver collected connection data that never
turned out to be useful for debugging.

Remove it to reduce dead code, and re-add a targeted observer later
if a concrete debugging need shows up.

CHANGELOG.md

@@ -8,23 +8,15 @@ and this project adheres to
 
 ## [Unreleased]
 
-### Added
-
-- ✨(frontend) introduce performance mode with auto-detection and telemetry
-
 ### Changed
 
 - 🔥(frontend) drop unused vendored ConnectionObserver
-- 🐛(frontend) vendor formatChatMessageLinks and trim surrounding newlines
 
 ### Fixed
 
 - 📈(frontend) downgrade unreachable external home URL from error to event
 - 🐛(frontend) handle 401 responses when syncing user preferences
 - 🐛(frontend) harden speaker test against missing sinks and play errors
-- 🐛(frontend) implement hysteresis band for the control bar layout
-- 🐛(frontend) fix toolbar ResizeObserver loop and alignment drift
-- 🐛(analytics) filter benign ResizeObserver loop error in Sentry/PostHog
 
 ## [1.26.0] - 2026-08-12
 

src/frontend/src/features/analytics/exceptionFilters.ts

@@ -1,24 +0,0 @@
-import type { CaptureResult } from 'posthog-js'
-
-const IGNORED_EXCEPTION_PATTERNS = [
-  /ResizeObserver loop (completed with undelivered notifications|limit exceeded)/,
-]
-
-const shouldIgnoreException = (value: unknown): boolean =>
-  typeof value === 'string' &&
-  IGNORED_EXCEPTION_PATTERNS.some((pattern) => pattern.test(value))
-
-export const filterExceptions = (
-  event: CaptureResult | null
-): CaptureResult | null => {
-  if (event?.event !== '$exception') return event
-
-  const exceptionList = event.properties?.['$exception_list']
-  const values: unknown[] = Array.isArray(exceptionList)
-    ? exceptionList.map((exception) => exception?.value)
-    : []
-
-  values.push(event.properties?.['$exception_message'])
-
-  return values.some(shouldIgnoreException) ? null : event
-}

src/frontend/src/features/analytics/hardware.ts

@@ -1,68 +0,0 @@
-export interface HardwareSnapshot {
-  /** navigator.hardwareConcurrency — logical CPU cores. */
-  cpu_cores: number | null
-  /** navigator.deviceMemory — RAM in GiB, bucketed by the browser (Chromium only). */
-  device_memory_gb: number | null
-  /** performance.memory.jsHeapSizeLimit in MB (Chromium only, non-standard). */
-  js_heap_limit_mb: number | null
-  /** performance.memory.usedJSHeapSize in MB (Chromium only, non-standard). */
-  js_heap_used_mb: number | null
-  /** Battery level 0..1 via navigator.getBattery() (Chromium only). */
-  battery_level: number | null
-  /** Whether the device is plugged in, via navigator.getBattery(). */
-  battery_charging: boolean | null
-}
-
-const BATTERY_TIMEOUT_MS = 1_000
-
-const toMb = (bytes: unknown): number | null =>
-  typeof bytes === 'number' ? Math.round(bytes / (1024 * 1024)) : null
-
-export const collectHardwareSnapshot = async (): Promise<HardwareSnapshot> => {
-  const snapshot: HardwareSnapshot = {
-    cpu_cores: null,
-    device_memory_gb: null,
-    js_heap_limit_mb: null,
-    js_heap_used_mb: null,
-    battery_level: null,
-    battery_charging: null,
-  }
-
-  try {
-    snapshot.cpu_cores = navigator.hardwareConcurrency ?? null
-
-    const nav = navigator as Navigator & {
-      deviceMemory?: number
-      userAgentData?: { mobile?: boolean; platform?: string }
-      getBattery?: () => Promise<{ level: number; charging: boolean }>
-    }
-
-    snapshot.device_memory_gb = nav.deviceMemory ?? null
-
-    const memory = (
-      performance as Performance & {
-        memory?: { jsHeapSizeLimit?: number; usedJSHeapSize?: number }
-      }
-    ).memory
-    snapshot.js_heap_limit_mb = toMb(memory?.jsHeapSizeLimit)
-    snapshot.js_heap_used_mb = toMb(memory?.usedJSHeapSize)
-
-    if (typeof nav.getBattery === 'function') {
-      // getBattery can hang on some platforms — don't let it delay the event.
-      const battery = await Promise.race([
-        nav.getBattery(),
-        new Promise<null>((resolve) =>
-          setTimeout(() => resolve(null), BATTERY_TIMEOUT_MS)
-        ),
-      ]).catch(() => null)
-      if (battery) {
-        snapshot.battery_level = battery.level
-        snapshot.battery_charging = battery.charging
-      }
-    }
-  } catch {
-    // telemetry must never break the app
-  }
-
-  return snapshot
-}

src/frontend/src/features/analytics/hooks/useAnalytics.ts

@@ -2,7 +2,6 @@ import { useEffect } from 'react'
 import { type ApiUser } from '@/features/auth/api/ApiUser'
 import { useUser } from '@/features/auth/api/useUser'
 import { getPosthog } from '../utils'
-import { filterExceptions } from '../exceptionFilters'
 
 export const startAnalyticsSession = (data: ApiUser) => {
   getPosthog().then((ph) => {
@@ -48,7 +47,6 @@ export const useAnalytics = ({
           capture_unhandled_rejections: true,
           capture_console_errors: true,
         },
-        before_send: filterExceptions,
       })
     })
   }, [id, host, flags_api_host, isDisabled])

src/frontend/src/features/analytics/telemetry.ts

@@ -30,7 +30,6 @@ export type LogCode =
   | 'clipboard_failure'
   | 'fullscreen_failure'
   | 'publish_sources_failure'
-  | 'performance_mode_failure'
   | 'disconnect_failure'
   | 'generic_failure'
 

src/frontend/src/features/chat/components/ChatMessageBody.tsx

@@ -1,6 +1,6 @@
 import { ChatRow } from '@/stores/chat'
 import React, { useMemo } from 'react'
-import { formatChatMessageLinks } from '../utils'
+import { formatChatMessageLinks } from '@livekit/components-react'
 import { css } from '@/styled-system/css'
 import { Text } from '@/primitives'
 

src/frontend/src/features/chat/utils.tsx

@@ -1,32 +0,0 @@
-import { tokenize, createDefaultGrammar } from '@livekit/components-core'
-import { ReactNode } from 'react'
-
-const defaultGrammar = Object.freeze(createDefaultGrammar())
-
-export function formatChatMessageLinks(message: string): ReactNode {
-  const trimmedMessage = message.replace(/^[\r\n]+|[\r\n]+$/g, '')
-  return tokenize(trimmedMessage, defaultGrammar).map((tok, i) => {
-    if (typeof tok === `string`) {
-      return tok
-    } else {
-      const content = tok.content.toString()
-      const href =
-        tok.type === `url`
-          ? /^http(s?):\/\//.test(content)
-            ? content
-            : `https://${content}`
-          : `mailto:${content}`
-      return (
-        <a
-          className="lk-chat-link"
-          key={i}
-          href={href}
-          target="_blank"
-          rel="noreferrer"
-        >
-          {content}
-        </a>
-      )
-    }
-  })
-}

src/frontend/src/features/notifications/NotificationDuration.ts

@@ -3,7 +3,6 @@ export enum ToastDuration {
   MEDIUM = 4000,
   LONG = 5000,
   EXTRA_LONG = 7000,
-  UNDO_WINDOW = 30000,
 }
 
 export const NotificationDuration = {
@@ -16,5 +15,4 @@ export const NotificationDuration = {
   REACTION_RECEIVED: ToastDuration.SHORT,
   RECORDING_REQUESTED: ToastDuration.LONG,
   ROLE_CHANGED: ToastDuration.LONG,
-  CPU_CONSTRAINED: ToastDuration.UNDO_WINDOW,
 } as const

src/frontend/src/features/notifications/NotificationType.ts

@@ -18,5 +18,4 @@ export enum NotificationType {
   RecordingSaving = 'recordingSaving',
   PermissionsRemoved = 'permissionsRemoved',
   RoleChanged = 'roleChanged',
-  CpuConstrained = 'cpuConstrained',
 }

src/frontend/src/features/notifications/components/ToastCpuConstrained.tsx

@@ -1,61 +0,0 @@
-import { useToast } from 'react-aria'
-import { useRef } from 'react'
-
-import { type ToastProps } from './Toast'
-import { VStack } from '@/styled-system/jsx'
-import { useTranslation } from 'react-i18next'
-import { Button, Text } from '@/primitives'
-import { css } from '@/styled-system/css'
-import { StyledToastContainer } from './StyledToastContainer'
-import { disablePerformanceMode } from '@/stores/performanceMode'
-import { captureEvent } from '@/features/analytics/telemetry'
-
-// todo - make it closable
-export function ToastCpuConstrained({ state, ...props }: Readonly<ToastProps>) {
-  const { t } = useTranslation('notifications', {
-    keyPrefix: 'cpuConstrained',
-  })
-  const ref = useRef(null)
-  const { toastProps, contentProps } = useToast(props, state, ref)
-  const toast = props.toast
-
-  const handleKeepQuality = () => {
-    captureEvent('cpu-constrained-degradation-cancelled')
-    disablePerformanceMode({ declinedAuto: true })
-    state.close(toast.key)
-  }
-
-  return (
-    <StyledToastContainer {...toastProps} ref={ref}>
-      <VStack
-        justify="start"
-        alignItems="self-start"
-        {...contentProps}
-        maxWidth="370px"
-        gap="0.75rem"
-        padding={14}
-      >
-        <Text
-          margin={false}
-          className={css({
-            wordBreak: 'break-word',
-            overflowWrap: 'break-word',
-            whiteSpace: 'normal',
-          })}
-        >
-          {t('message')}
-        </Text>
-        <Button
-          size="sm"
-          variant="text"
-          className={css({
-            color: 'primary.300',
-          })}
-          onPress={() => handleKeepQuality()}
-        >
-          {t('keepQuality')}
-        </Button>
-      </VStack>
-    </StyledToastContainer>
-  )
-}

src/frontend/src/features/notifications/components/ToastRegion.tsx

@@ -15,7 +15,6 @@ import { ToastPermissionsRemoved } from './ToastPermissionsRemoved'
 import { ToastRecordingRequest } from './ToastRecordingRequest'
 import { ToastAutoMuteLargeRoom } from './ToastAutoMuteLargeRoom'
 import { ToastRoleChanged } from '@/features/notifications/components/ToastRoleChanged'
-import { ToastCpuConstrained } from './ToastCpuConstrained'
 
 interface ToastRegionProps extends AriaToastRegionProps {
   state: ToastState<ToastData>
@@ -75,9 +74,6 @@ const renderToast = (
     case NotificationType.RoleChanged:
       return <ToastRoleChanged key={toast.key} toast={toast} state={state} />
 
-    case NotificationType.CpuConstrained:
-      return <ToastCpuConstrained key={toast.key} toast={toast} state={state} />
-
     default:
       return <Toast key={toast.key} toast={toast} state={state} />
   }

src/frontend/src/features/notifications/utils.ts

@@ -15,15 +15,6 @@ export const notifyAutoMutedOnJoin = () => {
   )
 }
 
-export const notifyCpuConstrained = () => {
-  toastQueue.add(
-    {
-      type: NotificationType.CpuConstrained,
-    },
-    { timeout: NotificationDuration.CPU_CONSTRAINED }
-  )
-}
-
 export const showLowerHandToast = (
   participant: Participant,
   onClose: () => void

src/frontend/src/features/performance/components/CpuConstrainedObserver.tsx

@@ -1,71 +0,0 @@
-import { useEffect, useRef } from 'react'
-import { useRoomContext } from '@livekit/components-react'
-import {
-  LocalTrackPublication,
-  LocalVideoTrack,
-  ParticipantEvent,
-  Track,
-} from 'livekit-client'
-
-import { captureEvent } from '@/features/analytics/telemetry'
-import { collectHardwareSnapshot } from '@/features/analytics/hardware'
-import { notifyCpuConstrained } from '@/features/notifications/utils'
-import { isFireFox } from '@/utils/livekit'
-import {
-  enablePerformanceMode,
-  performanceModeStore,
-} from '@/stores/performanceMode'
-
-export const CpuConstrainedObserver = () => {
-  const room = useRoomContext()
-  const degradedTracksRef = useRef(new WeakSet<LocalVideoTrack>())
-
-  useEffect(() => {
-    const localParticipant = room.localParticipant
-
-    const handleCpuConstrained = (
-      track: LocalVideoTrack,
-      publication: LocalTrackPublication
-    ) => {
-      const { enabled, userDeclinedAuto } = performanceModeStore
-
-      const shouldDegrade =
-        publication.source === Track.Source.Camera &&
-        !enabled &&
-        !userDeclinedAuto &&
-        !degradedTracksRef.current.has(track)
-
-      void collectHardwareSnapshot().then((hardware) => {
-        captureEvent('cpu-constrained', {
-          firefox: isFireFox(),
-          source: publication.source,
-          degraded: shouldDegrade,
-          trackOptions: publication.options,
-          performance_mode_enabled: enabled,
-          user_declined_auto: userDeclinedAuto,
-          ...hardware,
-        })
-      })
-
-      if (!shouldDegrade) return
-      degradedTracksRef.current.add(track)
-
-      enablePerformanceMode('cpu')
-      notifyCpuConstrained()
-    }
-
-    localParticipant.on(
-      ParticipantEvent.LocalTrackCpuConstrained,
-      handleCpuConstrained
-    )
-
-    return () => {
-      localParticipant.off(
-        ParticipantEvent.LocalTrackCpuConstrained,
-        handleCpuConstrained
-      )
-    }
-  }, [room])
-
-  return null
-}

src/frontend/src/features/performance/components/PerformanceModeController.tsx

@@ -1,108 +0,0 @@
-import { useEffect } from 'react'
-import { useRoomContext } from '@livekit/components-react'
-import {
-  LocalTrackPublication,
-  LocalVideoTrack,
-  ParticipantEvent,
-  Track,
-  TrackEvent,
-} from 'livekit-client'
-import { useSnapshot } from 'valtio'
-import { reportError } from '@/features/analytics/telemetry'
-import {
-  disablePerformanceMode,
-  performanceModeStore,
-} from '@/stores/performanceMode'
-import { degradeVideoTrack, restoreVideoTrack } from '../degradation'
-
-/** Delay to re-apply degradation after restart to avoid racing LiveKit's encoding recompute. */
-const REAPPLY_AFTER_RESTART_MS = 1_000
-
-/** Syncs performance mode store state to outbound camera track encoding settings. */
-export const PerformanceModeController = () => {
-  const room = useRoomContext()
-  const { enabled } = useSnapshot(performanceModeStore)
-
-  // Manage degradation application and track lifecycle events
-  useEffect(() => {
-    const localParticipant = room.localParticipant
-
-    const getCameraTrack = () => {
-      const pub = localParticipant.getTrackPublication(Track.Source.Camera)
-      return pub?.track instanceof LocalVideoTrack ? pub.track : null
-    }
-
-    const track = getCameraTrack()
-
-    // Restore track quality if performance mode is disabled
-    if (!enabled) {
-      if (track) {
-        restoreVideoTrack(track).catch((err) =>
-          reportError('performance_mode_failure', err, { action: 'restore' })
-        )
-      }
-      return
-    }
-
-    const applyDegradation = (t: LocalVideoTrack, action = 'degrade') => {
-      degradeVideoTrack(t).catch((err) =>
-        reportError('performance_mode_failure', err, { action })
-      )
-    }
-
-    // Re-apply degradation after track restarts (e.g. device/resolution changes)
-    const watchTrackRestart = (t: LocalVideoTrack) => {
-      let timeoutId: ReturnType<typeof setTimeout>
-      const onRestarted = () => {
-        clearTimeout(timeoutId)
-        timeoutId = setTimeout(() => {
-          if (performanceModeStore.enabled) applyDegradation(t, 'reapply')
-        }, REAPPLY_AFTER_RESTART_MS)
-      }
-      t.on(TrackEvent.Restarted, onRestarted)
-      return () => {
-        clearTimeout(timeoutId)
-        t.off(TrackEvent.Restarted, onRestarted)
-      }
-    }
-
-    let unwatchRestart: (() => void) | undefined
-
-    if (track) {
-      applyDegradation(track)
-      unwatchRestart = watchTrackRestart(track)
-    }
-
-    // Apply degradation to newly published camera tracks
-    const handlePublished = (pub: LocalTrackPublication) => {
-      if (
-        pub.source === Track.Source.Camera &&
-        pub.track instanceof LocalVideoTrack
-      ) {
-        unwatchRestart?.()
-        applyDegradation(pub.track)
-        unwatchRestart = watchTrackRestart(pub.track)
-      }
-    }
-    localParticipant.on(ParticipantEvent.LocalTrackPublished, handlePublished)
-
-    return () => {
-      localParticipant.off(
-        ParticipantEvent.LocalTrackPublished,
-        handlePublished
-      )
-      unwatchRestart?.()
-    }
-  }, [room, enabled])
-
-  // Reset auto (CPU-triggered) performance mode on unmount/leave room
-  useEffect(() => {
-    return () => {
-      if (performanceModeStore.trigger === 'cpu') {
-        disablePerformanceMode()
-      }
-    }
-  }, [])
-
-  return null
-}

src/frontend/src/features/performance/degradation.ts

@@ -1,126 +0,0 @@
-import { LocalVideoTrack } from 'livekit-client'
-import { isFireFox } from '@/utils/livekit'
-
-/** Target degraded encoding for layer 0 (~360p @ 15fps, ≤300kbps). */
-export const DEGRADED_MAX_HEIGHT = 360
-export const DEGRADED_MAX_FRAMERATE = 15
-export const DEGRADED_MAX_BITRATE = 300_000
-
-/**
- * Firefox ignores `active = false` on RTCRtpSender.
- * We starve higher layers using LiveKit's sentinel workaround values instead.
- */
-const FF_DISABLED_SCALE_DOWN = 4
-const FF_DISABLED_MAX_BITRATE = 10
-const FF_DISABLED_MAX_FRAMERATE = 2
-
-type SavedEncoding = Pick<
-  RTCRtpEncodingParameters,
-  'active' | 'scaleResolutionDownBy' | 'maxBitrate' | 'maxFramerate'
->
-
-/** Pre-degradation encoding snapshots keyed by track to prevent leaks. */
-const savedEncodingsByTrack = new WeakMap<LocalVideoTrack, SavedEncoding[]>()
-
-export const isTrackDegraded = (track: LocalVideoTrack) =>
-  savedEncodingsByTrack.has(track)
-
-/**
- * Revertibly degrades local video quality without unpublishing.
- * Avoids `prioritizePerformance()` because its internal flag disables dynacast permanently.
- *
- * - Layer 0: Capped to 360p / 15fps / 300kbps.
- * - Other layers: Set to `active: false` (or starved on Firefox).
- */
-export const degradeVideoTrack = async (track: LocalVideoTrack) => {
-  const sender = track.sender
-  if (!sender) {
-    throw new Error('sender not found')
-  }
-
-  const params = sender.getParameters()
-  if (!params.encodings || params.encodings.length === 0) {
-    return
-  }
-
-  // Snapshot once so re-applications don't overwrite pristine encodings
-  if (!savedEncodingsByTrack.has(track)) {
-    savedEncodingsByTrack.set(
-      track,
-      params.encodings.map((e) => ({
-        active: e.active,
-        scaleResolutionDownBy: e.scaleResolutionDownBy,
-        maxBitrate: e.maxBitrate,
-        maxFramerate: e.maxFramerate,
-      }))
-    )
-  }
-
-  const captureHeight =
-    track.mediaStreamTrack.getSettings().height ?? DEGRADED_MAX_HEIGHT
-
-  params.encodings = params.encodings.map((encoding, idx) => {
-    if (idx === 0) {
-      return {
-        ...encoding,
-        active: true,
-        scaleResolutionDownBy: Math.max(
-          1,
-          Math.ceil(captureHeight / DEGRADED_MAX_HEIGHT)
-        ),
-        maxFramerate: DEGRADED_MAX_FRAMERATE,
-        maxBitrate: Math.min(
-          encoding.maxBitrate ?? DEGRADED_MAX_BITRATE,
-          DEGRADED_MAX_BITRATE
-        ),
-      }
-    }
-
-    if (isFireFox()) {
-      const starved: RTCRtpEncodingParameters = {
-        ...encoding,
-        // Firefox workaround: active=false prevents LiveKit re-encodes, while starved values limit bitrate
-        active: false,
-        scaleResolutionDownBy: FF_DISABLED_SCALE_DOWN,
-        maxBitrate: FF_DISABLED_MAX_BITRATE,
-        maxFramerate: FF_DISABLED_MAX_FRAMERATE,
-      }
-      // LiveKit legacy property fallback for Firefox
-      ;(starved as Record<string, unknown>).maxFrameRate =
-        FF_DISABLED_MAX_FRAMERATE
-      return starved
-    }
-
-    return { ...encoding, active: false }
-  })
-
-  await sender.setParameters(params)
-}
-
-/** Restores encodings captured prior to degradation. */
-export const restoreVideoTrack = async (track: LocalVideoTrack) => {
-  const saved = savedEncodingsByTrack.get(track)
-  savedEncodingsByTrack.delete(track)
-
-  const sender = track.sender
-  if (!saved || !sender) {
-    return
-  }
-
-  const params = sender.getParameters()
-  if (!params.encodings || params.encodings.length !== saved.length) {
-    return
-  }
-
-  params.encodings = params.encodings.map((encoding, idx) => {
-    const restored: RTCRtpEncodingParameters = {
-      ...encoding,
-      ...saved[idx],
-    }
-    // Clean up Firefox legacy property if set during degradation
-    ;(restored as Record<string, unknown>).maxFrameRate = undefined
-    return restored
-  })
-
-  await sender.setParameters(params)
-}

src/frontend/src/features/reactions/components/toolbar/ReactionButtonsContainer.tsx

@@ -26,8 +26,8 @@ const StyledContainer = styled('div', {
     backgroundColor: 'primaryDark.100',
     maxWidth: '100%',
     opacity: 0,
-    translate: '0 3.25rem',
-    transition: 'opacity, translate',
+    transform: 'translateY(3.25rem)',
+    transition: 'opacity, transform',
     transitionDuration: '0.5s',
     transitionTimingFunction: 'cubic-bezier(0.4, 0, 0.2, 1)',
     pointerEvents: 'none',
@@ -36,7 +36,7 @@ const StyledContainer = styled('div', {
     isVisible: {
       true: {
         opacity: 1,
-        translate: '0 0',
+        transform: 'translateY(0)',
         pointerEvents: 'auto',
       },
     },
@@ -84,7 +84,7 @@ export const ReactionButtonsContainer = ({
     shouldBeCenteredWithToggleButton,
     setShouldBeCenteredWithToggleButton,
   ] = useState(false)
-  const [offsetX, setOffsetX] = useState(0)
+  const [rightOffset, setRightOffset] = useState(0)
 
   const updateArrows = useCallback(() => {
     const el = scrollRef.current
@@ -115,7 +115,7 @@ export const ReactionButtonsContainer = ({
 
   useLayoutEffect(() => {
     if (!shouldBeCenteredWithToggleButton || isMobile) {
-      setOffsetX(0)
+      setRightOffset(0)
       return
     }
 
@@ -133,7 +133,7 @@ export const ReactionButtonsContainer = ({
       const containerCenterX = containerRect.left + containerRect.width / 2
       const shift = toggleCenterX - containerCenterX
       if (Math.abs(shift) < 0.5) return
-      setOffsetX((prev) => prev + shift)
+      setRightOffset((prev) => prev - shift * 2)
     }
 
     const schedule = () => {
@@ -182,7 +182,7 @@ export const ReactionButtonsContainer = ({
       isVisible={isVisible}
       style={
         shouldBeCenteredWithToggleButton && !isMobile && adjustedCentering
-          ? { transform: `translateX(${offsetX}px)` }
+          ? { marginRight: `${rightOffset}px` }
           : { margin: '0 15px' }
       }
     >

src/frontend/src/features/rooms/livekit/components/VideoResolutionSubscription.tsx

@@ -9,18 +9,15 @@ import {
 } from 'livekit-client'
 import { useSnapshot } from 'valtio'
 import { userChoicesStore } from '@/stores/userChoices'
-import { performanceModeStore } from '@/stores/performanceMode'
 
+/**
+ * Sets initial video quality for new participants as they join.
+ * LiveKit doesn't allow handling video quality preferences at the room level.
+ */
 export const VideoResolutionSubscription = () => {
   const { videoSubscribeQuality } = useSnapshot(userChoicesStore)
-  const { enabled: isPerformanceModeEnabled } =
-    useSnapshot(performanceModeStore)
   const room = useRoomContext()
 
-  const effectiveQuality = isPerformanceModeEnabled
-    ? VideoQuality.LOW
-    : (videoSubscribeQuality ?? VideoQuality.HIGH)
-
   useEffect(() => {
     if (!room) return
 
@@ -28,12 +25,18 @@ export const VideoResolutionSubscription = () => {
       publication: RemoteTrackPublication,
       _participant: RemoteParticipant
     ) => {
-      if (effectiveQuality === VideoQuality.HIGH) return
+      // By default, the maximum quality is set to high
+      if (
+        videoSubscribeQuality === undefined ||
+        videoSubscribeQuality === VideoQuality.HIGH
+      )
+        return
+
       if (
         publication.kind === Track.Kind.Video &&
         publication.source !== Track.Source.ScreenShare
       ) {
-        publication.setVideoQuality(effectiveQuality)
+        publication.setVideoQuality(videoSubscribeQuality)
       }
     }
 
@@ -41,20 +44,7 @@ export const VideoResolutionSubscription = () => {
     return () => {
       room.off(RoomEvent.TrackPublished, handleTrackPublished)
     }
-  }, [room, effectiveQuality])
-
-  useEffect(() => {
-    if (!room) return
-
-    room.remoteParticipants.forEach((participant) => {
-      participant.videoTrackPublications.forEach((publication) => {
-        if (publication.source === Track.Source.ScreenShare) return
-        if (publication.videoQuality !== effectiveQuality) {
-          publication.setVideoQuality(effectiveQuality)
-        }
-      })
-    })
-  }, [room, effectiveQuality])
+  }, [room, videoSubscribeQuality])
 
   return null
 }

src/frontend/src/features/rooms/livekit/prefabs/ControlBar/MoreOptions.tsx

@@ -12,8 +12,7 @@ import type { ToggleButtonProps } from '@/primitives/ToggleButton'
 import { RiArrowDownSLine, RiArrowUpSLine } from '@remixicon/react'
 import { useTranslation } from 'react-i18next'
 
-const CONTROL_BAR_BREAKPOINT_WIDE = 1100
-const CONTROL_BAR_BREAKPOINT_NARROW = 1050
+const CONTROL_BAR_BREAKPOINT = 1100
 
 const NavigationControls = ({
   onPress,
@@ -66,9 +65,10 @@ export const LateralMenu = () => {
     </DialogTrigger>
   )
 }
+
 interface BreakpointObserverProps {
   containerRef: RefObject<HTMLDivElement>
-  onWideChange: (isWide: boolean | null) => void
+  onWideChange: (isWide: boolean) => void
 }
 
 const BreakpointObserver = ({
@@ -76,20 +76,7 @@ const BreakpointObserver = ({
   onWideChange,
 }: BreakpointObserverProps) => {
   const { width } = useSize(containerRef)
-  const [isWide, setIsWide] = useState<boolean | null>(null)
-
-  useEffect(() => {
-    if (!width) {
-      return
-    }
-    if (width > CONTROL_BAR_BREAKPOINT_WIDE) {
-      setIsWide(true)
-    } else if (width <= CONTROL_BAR_BREAKPOINT_NARROW) {
-      setIsWide(false)
-    } else {
-      setIsWide((prev) => (prev === null ? false : prev))
-    }
-  }, [width])
+  const isWide = width > CONTROL_BAR_BREAKPOINT
 
   useEffect(() => {
     onWideChange(isWide)
@@ -103,7 +90,7 @@ export const MoreOptions = ({
 }: {
   parentElement: RefObject<HTMLDivElement>
 }) => {
-  const [isWide, setIsWide] = useState<boolean | null>(null)
+  const [isWide, setIsWide] = useState(false)
 
   return (
     <nav
@@ -120,7 +107,7 @@ export const MoreOptions = ({
         containerRef={parentElement}
         onWideChange={setIsWide}
       />
-      {isWide !== null && (isWide ? <NavigationControls /> : <LateralMenu />)}
+      {isWide ? <NavigationControls /> : <LateralMenu />}
     </nav>
   )
 }

src/frontend/src/features/rooms/livekit/prefabs/VideoConference.tsx

@@ -27,8 +27,6 @@ import { PinAnnouncer } from '@/features/layout/components/PinAnnouncer'
 import { ChatProvider } from '@/features/chat/components/ChatProvider'
 import { SyncDevicePreferences } from '@/features/rooms/livekit/components/SyncDevicePreferences'
 import { RoomSilentMicDetector } from '@/features/rooms/components/SilentMicDetector'
-import { CpuConstrainedObserver } from '@/features/performance/components/CpuConstrainedObserver'
-import { PerformanceModeController } from '@/features/performance/components/PerformanceModeController'
 
 /**
  * @public
@@ -72,8 +70,6 @@ export function VideoConference({ ...props }: VideoConferenceProps) {
       <MediaStateObserver />
       <ChatProvider />
       <VideoResolutionSubscription />
-      <PerformanceModeController />
-      <CpuConstrainedObserver />
       <div
         className="lk-video-conference"
         {...props}

src/frontend/src/features/settings/components/tabs/VideoTab.tsx

@@ -22,11 +22,6 @@ import {
 } from '@/stores/userChoices'
 import { RowWrapper } from './layout/RowWrapper'
 import { useSnapshot } from 'valtio'
-import {
-  disablePerformanceMode,
-  enablePerformanceMode,
-  performanceModeStore,
-} from '@/stores/performanceMode'
 
 export type VideoTabProps = Pick<DialogProps, 'onOpenChange'> &
   Pick<TabPanelProps, 'id'>
@@ -37,7 +32,7 @@ const EMPTY_PROPS = {}
 
 export const VideoTab = ({ id }: VideoTabProps) => {
   const { t } = useTranslation('settings', { keyPrefix: 'video' })
-  const { localParticipant } = useRoomContext()
+  const { localParticipant, remoteParticipants } = useRoomContext()
 
   const {
     videoDeviceId,
@@ -46,9 +41,6 @@ export const VideoTab = ({ id }: VideoTabProps) => {
     videoSubscribeQuality,
   } = useSnapshot(userChoicesStore)
 
-  const { enabled: isPerformanceModeEnabled } =
-    useSnapshot(performanceModeStore)
-
   const [videoElement, setVideoElement] = useState<HTMLVideoElement | null>(
     null
   )
@@ -93,6 +85,22 @@ export const VideoTab = ({ id }: VideoTabProps) => {
     }
   }
 
+  /**
+   * Updates video quality for all existing remote video tracks when user preference changes.
+   * LiveKit doesn't support setting video quality preferences at the room level for remote participants,
+   * so this function applies the selected quality to all existing remote video tracks.
+   * Hook useVideoResolutionSubscription updates quality preferences of new participants joining.
+   */
+  const updateExistingRemoteVideoQuality = (selectedQuality: VideoQuality) => {
+    remoteParticipants.forEach((participant) => {
+      participant.videoTrackPublications.forEach((publication) => {
+        if (publication.videoQuality !== selectedQuality) {
+          publication.setVideoQuality(selectedQuality)
+        }
+      })
+    })
+  }
+
   useEffect(() => {
     let videoTrack: LocalVideoTrack | null = null
 
@@ -209,13 +217,10 @@ export const VideoTab = ({ id }: VideoTabProps) => {
           type="select"
           label={t('resolution.publish.label')}
           items={resolutionItems}
-          selectedKey={
-            isPerformanceModeEnabled ? 'h360' : videoPublishResolution
-          }
+          selectedKey={videoPublishResolution}
           onSelectionChange={async (key) => {
             await handleVideoResolutionChange(key as VideoResolution)
           }}
-          isDisabled={isPerformanceModeEnabled}
           style={{
             width: '100%',
           }}
@@ -227,43 +232,19 @@ export const VideoTab = ({ id }: VideoTabProps) => {
           type="select"
           label={t('resolution.subscribe.label')}
           items={videoQualityItems}
-          selectedKey={
-            isPerformanceModeEnabled
-              ? VideoQuality.LOW.toString()
-              : videoSubscribeQuality?.toString()
-          }
+          selectedKey={videoSubscribeQuality?.toString()}
           onSelectionChange={(key) => {
             if (key == undefined) return
             const selectedQuality = Number(String(key))
             saveVideoSubscribeQuality(selectedQuality)
+            updateExistingRemoteVideoQuality(selectedQuality)
           }}
-          isDisabled={isPerformanceModeEnabled}
           style={{
             width: '100%',
           }}
         />
         <></>
       </RowWrapper>
-      <RowWrapper heading={t('performance.heading')}>
-        <Field
-          type="switch"
-          label={t('performance.label')}
-          description={t('performance.description')}
-          isSelected={isPerformanceModeEnabled}
-          onChange={(value) => {
-            if (value) {
-              enablePerformanceMode('manual')
-            } else {
-              disablePerformanceMode()
-            }
-          }}
-          wrapperProps={{
-            noMargin: true,
-            fullWidth: true,
-          }}
-        />
-        <></>
-      </RowWrapper>
     </TabPanel>
   )
 }

src/frontend/src/locales/de/notifications.json

@@ -18,10 +18,6 @@
     "auto": "Sie haben an einer großen Besprechung teilgenommen. Ihr Mikrofon wurde automatisch stummgeschaltet.",
     "dismiss": "Stummschaltung aufheben"
   },
-  "cpuConstrained": {
-    "message": "Ihr Gerät ist stark ausgelastet. Die Videoqualität wurde reduziert, um das Gespräch flüssig zu halten.",
-    "keepQuality": "Ursprüngliche Qualität beibehalten"
-  },
   "reaction": {
     "description": "{{name}} hat mit {{emoji}} reagiert"
   },

src/frontend/src/locales/de/settings.json

@@ -70,11 +70,6 @@
         }
       }
     },
-    "performance": {
-      "heading": "Leistung",
-      "label": "Leistung priorisieren",
-      "description": "Reduziert die Qualität Ihrer Videos, um Ihr Gerät zu entlasten. Wird bei Überlastung automatisch aktiviert. Deaktivieren Sie diese Funktion, um wieder die maximale Qualität zu erhalten."
-    },
     "permissionsRequired": "Berechtigungen erforderlich"
   },
   "transcription": {

src/frontend/src/locales/en/notifications.json

@@ -18,10 +18,6 @@
     "auto": "You have joined a large meeting. Your microphone has been automatically muted.",
     "dismiss": "Unmute"
   },
-  "cpuConstrained": {
-    "message": "Your device is running low on processing power. Video quality has been reduced to keep the call smooth.",
-    "keepQuality": "Keep original quality"
-  },
   "reaction": {
     "description": "{{name}} reacted with {{emoji}}"
   },

src/frontend/src/locales/en/settings.json

@@ -70,11 +70,6 @@
         }
       }
     },
-    "performance": {
-      "heading": "Performance",
-      "label": "Prioritize performance",
-      "description": "Reduces the quality of your videos to take the strain off your device. Automatically activates in case of overload. Disable it to restore maximum quality."
-    },
     "permissionsRequired": "Permissions required"
   },
   "transcription": {

src/frontend/src/locales/fr/notifications.json

@@ -18,10 +18,6 @@
     "auto": "Vous venez de rejoindre une grande réunion. Votre micro a été automatiquement coupé.",
     "dismiss": "Rétablir le micro"
   },
-  "cpuConstrained": {
-    "message": "Votre appareil manque de puissance. La qualité vidéo a été réduite pour préserver la fluidité de l'appel.",
-    "keepQuality": "Conserver la qualité d'origine"
-  },
   "reaction": {
     "description": "{{name}} a reagi avec {{emoji}}"
   },

src/frontend/src/locales/fr/settings.json

@@ -70,11 +70,6 @@
         }
       }
     },
-    "performance": {
-      "heading": "Performances",
-      "label": "Privilégier les performances",
-      "description": "Réduit la qualité de vos vidéos pour soulager votre appareil. S’active automatiquement en cas de surcharge. Désactivez-la pour retrouver la qualité maximale."
-    },
     "permissionsRequired": "Autorisations nécessaires"
   },
   "transcription": {

src/frontend/src/locales/nl/notifications.json

@@ -18,10 +18,6 @@
     "auto": "U bent zojuist lid geworden van een grote vergadering. Uw microfoon is automatisch gedempt.",
     "dismiss": "Microfoon inschakelen"
   },
-  "cpuConstrained": {
-    "message": "Uw apparaat is zwaar belast. De videokwaliteit is verlaagd om het gesprek soepel te laten verlopen.",
-    "keepQuality": "Oorspronkelijke kwaliteit behouden"
-  },
   "reaction": {
     "description": "{{name}} reageerde met {{emoji}}"
   },

src/frontend/src/locales/nl/settings.json

@@ -70,11 +70,6 @@
         }
       }
     },
-    "performance": {
-      "heading": "Prestaties",
-      "label": "Prestaties prioriteren",
-      "description": "Vermindert de kwaliteit van je video's om je apparaat te ontlasten. Wordt automatisch geactiveerd bij overbelasting. Schakel het uit om de maximale kwaliteit te herstellen."
-    },
     "permissionsRequired": "Machtigingen vereist"
   },
   "transcription": {

src/frontend/src/stores/performanceMode.ts

@@ -1,30 +0,0 @@
-import { proxy } from 'valtio'
-
-export type PerformanceModeTrigger = 'cpu' | 'manual'
-
-export const performanceModeStore = proxy<{
-  enabled: boolean
-  trigger: PerformanceModeTrigger | null
-  userDeclinedAuto: boolean
-}>({
-  enabled: false,
-  trigger: null,
-  userDeclinedAuto: false,
-})
-
-export const enablePerformanceMode = (trigger: PerformanceModeTrigger) => {
-  if (performanceModeStore.enabled) return
-  performanceModeStore.enabled = true
-  performanceModeStore.trigger = trigger
-}
-
-export const disablePerformanceMode = ({
-  declinedAuto = false,
-}: { declinedAuto?: boolean } = {}) => {
-  if (declinedAuto) {
-    performanceModeStore.userDeclinedAuto = true
-  }
-  if (!performanceModeStore.enabled) return
-  performanceModeStore.enabled = false
-  performanceModeStore.trigger = null
-}