Performance Medium

Reduce third-party request volume

Once a site is served over HTTP/2 or HTTP/3, the number of requests a browser makes stops being the dominant cost, because multiplexing over one connection removed the old per-host connection limit that made bundling and sprite sheets worthwhile. What still matters is how many of those requests go to origins the site owner does not control: every analytics tag, ad pixel, chat widget, and web font from a third-party CDN adds its own DNS lookup, connection, and script-execution cost that no amount of first-party bundling can remove.

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Why it matters

On sites already served over HTTP/2 or HTTP/3, first-party bundling stops being the dominant performance cost: third-party tags (analytics, ads, chat widgets, fonts) usually are, and unlike first-party code the owner cannot bundle them at build time, only choose to run fewer of them.

How to fix

1 List every distinct third-party origin the page loads a request from, and identify which tag or embed each one belongs to.
2 Remove tags that are no longer used, and consolidate overlapping tools where one tag manager can load what several separate snippets currently do.
3 Defer non-critical third-party scripts (chat widgets, marketing pixels) so they load after the page is interactive instead of blocking it.

Common mistakes

Adding a new marketing or analytics tag through a tag manager without ever removing the old one it replaced, so both keep firing on every page load.
Treating "our site is fast" as proven by a Lighthouse run on a page with ad blockers or consent banners suppressing the third-party scripts that real visitors actually load.
Assuming a single tag manager script counts as "one request", when the tags configured inside it can each pull in several more third-party origins of their own.

How to verify

1 Open devtools network panel, filter by domain, and count how many distinct third-party origins the page actually loads a request from.
2 Check each vendor script against what it is currently used for (dashboards, reports, or a marketing team change log) to confirm it is still needed.
3 Re-run the scan after removing or deferring a tag and confirm both the third-party request count and total page weight actually dropped.

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