diff --git a/scripts/src/hwlab-node-web-observe-runner-source.ts b/scripts/src/hwlab-node-web-observe-runner-source.ts
index a386b6c9..154886ac 100644
--- a/scripts/src/hwlab-node-web-observe-runner-source.ts
+++ b/scripts/src/hwlab-node-web-observe-runner-source.ts
@@ -3398,6 +3398,11 @@ function buildRuntimeAlerts(samples, control, network, consoleEvents, errors) {
     .map((item) => Date.parse(item.ts))
     .filter(Number.isFinite)
     .sort((a, b) => a - b);
+  const observerRefreshTimes = control
+    .filter((item) => item.type === "observer-periodic-refresh")
+    .map((item) => Date.parse(item.ts))
+    .filter(Number.isFinite)
+    .sort((a, b) => a - b);
   const naturalNetwork = network.filter((item) => item?.observerInitiated !== true);
   const httpErrors = naturalNetwork
     .filter((item) => item?.type === "response" && Number(item.status) >= 400)
@@ -3405,7 +3410,9 @@ function buildRuntimeAlerts(samples, control, network, consoleEvents, errors) {
   const requestFailed = naturalNetwork
     .filter((item) => item?.type === "requestfailed")
     .map((item) => networkAlertEvent(item, promptTimes));
-  const significantRequestFailed = requestFailed.filter((item) => !isBenignLongLivedStreamClosureAlert(item));
+  const significantRequestFailed = requestFailed.filter(
+    (item) => !isBenignLongLivedStreamClosureAlert(item) && !isObserverRefreshClosureAlert(item, observerRefreshTimes),
+  );
   const domDiagnostics = [];
   const executionErrors = [];
   const baselineExecutionErrors = [];
@@ -3789,6 +3796,15 @@ function isBenignLongLivedStreamClosureAlert(event) {
   return /ERR_NETWORK_CHANGED|ERR_ABORTED|net::ERR_NETWORK_CHANGED|net::ERR_ABORTED|aborted|network changed/iu.test(text);
 }
 
+function isObserverRefreshClosureAlert(event, observerRefreshTimes) {
+  if (!["/v1/workbench/events", "/v1/web-performance"].includes(String(event?.urlPath || ""))) return false;
+  if (event.status !== null && event.status !== undefined && Number(event.status) > 0) return false;
+  const text = String(event.failureKind || event.errorPreview || event.preview || "");
+  if (!/ERR_NETWORK_CHANGED|ERR_ABORTED|net::ERR_NETWORK_CHANGED|net::ERR_ABORTED|aborted|network changed/iu.test(text)) return false;
+  const ts = Date.parse(String(event.ts || ""));
+  return Number.isFinite(ts) && observerRefreshTimes.some((refreshTs) => Math.abs(ts - refreshTs) <= 8000);
+}
+
 function networkAlertEvent(item, promptTimes) {
   const failureText = item.failureKind ?? item.failure ?? item.errorText ?? null;
   return {
@@ -5176,8 +5192,8 @@ function buildCodeAgentCardTimingMetrics(samples, timeline, turnTiming) {
     const timelineItem = timeline[index] || {};
     for (const card of codeAgentCardsForSample(sample)) {
       const text = codeAgentCardText(card);
-      const totalElapsedValues = parseTotalElapsedSeconds(text).filter(Number.isFinite);
-      const recentUpdateValues = parseRecentUpdateSeconds(text).filter(Number.isFinite);
+      const totalElapsedValues = parseTotalElapsedSeconds(card?.durationText).filter(Number.isFinite);
+      const recentUpdateValues = parseRecentUpdateSeconds(card?.activityText).filter(Number.isFinite);
       const terminal = isCodeAgentCardTerminal(card);
       const row = {
         ...ref(sample),
@@ -5427,7 +5443,7 @@ function detectPostCompletionTimingChanges(turnTiming, event) {
       if (!cell) continue;
       if (event.traceId && cell.traceId && cell.traceId !== event.traceId) continue;
       if (event.messageId && cell.messageId && cell.messageId !== event.messageId) continue;
-      const total = Number(cell.totalElapsedSeconds);
+      const total = cell.totalElapsedSeconds === null || cell.totalElapsedSeconds === undefined ? NaN : Number(cell.totalElapsedSeconds);
       if (Number.isFinite(total)) {
         if (previousTotal && Math.abs(total - previousTotal.value) > alertThresholds.turnTimingSampleSlackSeconds) {
           timingChanges.push({
@@ -5450,7 +5466,7 @@ function detectPostCompletionTimingChanges(turnTiming, event) {
         }
         previousTotal = { value: total, seq: row.seq ?? null, ts: row.ts ?? null };
       }
-      const recent = Number(cell.recentUpdateSeconds);
+      const recent = cell.recentUpdateSeconds === null || cell.recentUpdateSeconds === undefined ? NaN : Number(cell.recentUpdateSeconds);
       if (Number.isFinite(recent)) {
         recentUpdateVisible.push({
           ...eventRef(event),