tor-browser

commit 2a53c8b5c00f83dfc24c1eb2192171f4947ce0c1
parent 76d3a11be319860b8224d582c699cad18982aa07
Author: acreskeyMoz <acreskey@mozilla.com>
Date:   Mon, 20 Oct 2025 22:38:10 +0000

Bug 1993597 - Record zero values for time to request start in the Pageload event as they can occur with established connections r=denispal

Speculative and pre-established connections may yield zero or slightly negative timeToRequestStart timings.
We record these as zero to maintain consistent, non-negative timing data, while still capturing the impact of early connection establishment.

Differential Revision: https://phabricator.services.mozilla.com/D269271

Diffstat:
M
dom/base/Document.cpp
 | 
6
++++++

1 file changed, 6 insertions(+), 0 deletions(-)
diff --git a/dom/base/Document.cpp b/dom/base/Document.cpp
@@ -2546,6 +2546,12 @@ void Document::AccumulatePageLoadTelemetry() {
       if (timeToRequestStart > zeroDuration) {
         mPageloadEventData.set_timeToRequestStart(
             static_cast<uint32_t>(timeToRequestStart.ToMilliseconds()));
+      } else {
+        // Speculative and pre-established connections may yield zero or
+        // slightly negative timeToRequestStart timings. We record these as zero
+        // to maintain consistent, non-negative timing data, while still
+        // capturing the impact of early connection establishment.
+        mPageloadEventData.set_timeToRequestStart(0);
       }
     }