Cap LCP download time

GoogleChrome · Aug 30, 2024 · 2e3bb83 · 2e3bb83
1 parent 9b93251
commit 2e3bb83
Showing 1 changed file with 7 additions and 3 deletions.
diff --git a/src/attribution/onLCP.ts b/src/attribution/onLCP.ts
@@ -54,9 +54,13 @@ const attributeLCP = (metric: LCPMetric): LCPMetricWithAttribution => {
               activationStart
           : 0,
       );
-      const lcpResponseEnd = Math.max(
-        lcpRequestStart,
-        lcpResourceEntry ? lcpResourceEntry.responseEnd - activationStart : 0,
+      const lcpResponseEnd = Math.min(
+        Math.max(
+          lcpRequestStart,
+          lcpResourceEntry ? lcpResourceEntry.responseEnd - activationStart : 0,
+        ),
+        // Cap at LCP time (videos continue downloading after LCP for example)
+        lcpEntry.startTime - activationStart,
       );
       const lcpRenderTime = Math.max(
         lcpResponseEnd,