diff --git a/scripts/run_object_batch_bench_enhanced.sh b/scripts/run_object_batch_bench_enhanced.sh
index 08163070e..73fb0a5e3 100755
--- a/scripts/run_object_batch_bench_enhanced.sh
+++ b/scripts/run_object_batch_bench_enhanced.sh
@@ -1322,10 +1322,21 @@ compare_baseline() {
 
       dr="N/A"; dl="N/A"; dt="N/A"; dp90="N/A"; dp99="N/A"; ne="N/A"; be="N/A"; de="N/A"
       if (br!="N/A" && n_req!="N/A" && br+0!=0) dr=sprintf("%.2f", ((n_req-br)/br)*100)
-      if (bl!="N/A" && n_lat!="N/A" && bl+0!=0) dl=sprintf("%.2f", ((n_lat-bl)/bl)*100)
+      if (bl!="N/A" && n_lat!="N/A") {
+        if (bl+0!=0) dl=sprintf("%.2f", ((n_lat-bl)/bl)*100)
+        else if (n_lat+0==0) dl="0.00"
+      }
       if (bt!="N/A" && n_thr!="N/A" && bt+0!=0) dt=sprintf("%.2f", ((n_thr-bt)/bt)*100)
-      if (bp90!="N/A" && n_p90!="N/A" && bp90+0!=0) dp90=sprintf("%.2f", ((n_p90-bp90)/bp90)*100)
-      if (bp99!="N/A" && n_p99!="N/A" && bp99+0!=0) dp99=sprintf("%.2f", ((n_p99-bp99)/bp99)*100)
+      # Warp v1 rounds sub-millisecond latency to 0s. Two zero readings are
+      # the same below-resolution bucket; a nonzero candidate remains invalid.
+      if (bp90!="N/A" && n_p90!="N/A") {
+        if (bp90+0!=0) dp90=sprintf("%.2f", ((n_p90-bp90)/bp90)*100)
+        else if (n_p90+0==0) dp90="0.00"
+      }
+      if (bp99!="N/A" && n_p99!="N/A") {
+        if (bp99+0!=0) dp99=sprintf("%.2f", ((n_p99-bp99)/bp99)*100)
+        else if (n_p99+0==0) dp99="0.00"
+      }
       if (n_ok!="N/A" && n_fail!="N/A" && n_ok+n_fail>0) ne=sprintf("%.2f", (n_fail/(n_ok+n_fail))*100)
       if (bok!="N/A" && bfail!="N/A" && bok+bfail>0) be=sprintf("%.2f", (bfail/(bok+bfail))*100)
       if (ne!="N/A" && be!="N/A") de=sprintf("%.2f", ne-be)
diff --git a/scripts/test_object_batch_bench_enhanced.sh b/scripts/test_object_batch_bench_enhanced.sh
index be8f90dca..3be561a31 100755
--- a/scripts/test_object_batch_bench_enhanced.sh
+++ b/scripts/test_object_batch_bench_enhanced.sh
@@ -76,6 +76,15 @@ cat >"$FAKE_WARP" <<'EOF'
 set -euo pipefail
 [[ " $* " == *" --analyze.v "* ]]
 [[ " $* " == *" --no-color "* ]]
+if [[ "${FAKE_WARP_ZERO_LATENCY:-0}" == "1" ]]; then
+  cat <<'LOG'
+Operation: GET. Concurrency: 8. Ran: 7s
+Requests considered: 1000:
+ * Average: 160.00 MiB/s, 40960.00 obj/s
+ * Avg: 0s, 50%: 0s, 90%: 0s, 99%: 0s, Fastest: 0s, Slowest: 1ms, StdDev: 0s
+LOG
+  exit 0
+fi
 cat <<'LOG'
  -       PUT Average: 161 Obj/s, 5.0MiB/s; Current 161 Obj/s, 5.0MiB/s.
 Operation: GET. Concurrency: 64. Ran: 7s
@@ -164,4 +173,28 @@ awk -F',' '
   END { exit found ? 0 : 1 }
 ' "${TMP_DIR}/fake-warp-candidate/baseline_compare.csv"
 
+for leg in baseline candidate; do
+  zero_args=(
+    --tool warp
+    --endpoint http://127.0.0.1:9000
+    --access-key test-access
+    --secret-key test-secret
+    --sizes 4KiB
+    --rounds 1
+    --retry-per-round 1
+    --cooldown-secs 0
+    --duration 1s
+    --out-dir "${TMP_DIR}/fake-warp-zero-${leg}"
+    --warp-bin "$FAKE_WARP"
+  )
+  if [[ "$leg" == "candidate" ]]; then
+    zero_args+=(--baseline-csv "${TMP_DIR}/fake-warp-zero-baseline/median_summary.csv")
+  fi
+  FAKE_WARP_ZERO_LATENCY=1 "$RUNNER" "${zero_args[@]}" >/dev/null 2>&1
+done
+
+"${SCRIPT_DIR}/hotpath_warp_ab_gate.sh" \
+  --compare-csv "${TMP_DIR}/fake-warp-zero-candidate/baseline_compare.csv" \
+  --require-tail-error >/dev/null
+
 echo "object batch benchmark enhanced tests passed"