Skip to content

Defer client telemetry off the load critical path #28

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
pedropaulovc merged 1 commit into from
May 29, 2026
Merged

Defer client telemetry off the load critical path #28

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
18 changes: 15 additions & 3 deletions src/layouts/Layout.astro
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -111,9 +111,21 @@ const telemetryConfig = Astro.locals.telemetry?.clientConfig() ?? null;
<body>
<slot />
<script>
import { initTelemetry, trackPageview } from "@/lib/telemetry";
initTelemetry();
trackPageview(location.pathname, document.title);
// Telemetry is pure analytics — never let it sit on the load critical
// path. Lazy-import the chunk (web-vitals + AI client) and fire the first
// pageview only once the main thread is idle, so the slow App Insights
// /track round-trip happens well after load. web-vitals reads buffered
// LCP/FCP/CLS entries, so deferring registration doesn't lose metrics.
Comment on lines +116 to +118
const startTelemetry = () =>
import("@/lib/telemetry").then(({ initTelemetry, trackPageview }) => {
initTelemetry();
trackPageview(location.pathname, document.title);
});
Comment on lines +119 to +123
if ("requestIdleCallback" in window) {
requestIdleCallback(startTelemetry, { timeout: 4000 });
} else {
window.addEventListener("load", () => setTimeout(startTelemetry, 1), { once: true });
}
</script>
</body>
</html>