The Performance Of Others

on YouTube ↗05m

" summary

Built a JavaScript polyfill for Resource Timing that backfills W3C timing data into older browsers and hooks into Compuware dynaTrace, revealing exact third‑party contributions. Real user traces correlate origins and show a 25 second image response coming from a third party, and an unexpected 142 third‑party domains loaded into one page; root cause traces to IE7 browser plugin injections (eg skype.com) that rewrite HTML and slow load times.

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