"Bottleneck Analysis"

on YouTube ↗50m

" summary

Browser profiling with Chrome devtools and field collection via Boomerang shows concrete delays: multiple JS files block rendering for >3s, DNS lookups add 20–100ms each, cookies can add ~1.1s, and a double SSL redirect costs about 400ms SSL then ~110ms more (~500ms total). Server tests with ApacheBench and XHProf reveal that XHProf costs ~10–15% overhead, opcode caching keeps PHP vs static within ~2x, and PHP notices can cause a 5x slowdown from E_NOTICE under realistic loads.

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" chapters (7)

1. 0:00Start
2. 6:37PROFILING THE USER EXPERIENCE
3. 24:54SEARCHING FOR WEB SERVER BOTTLENECKS
4. 27:41TESTING WEB SERVER FOR BOTTLENECKS
5. 41:31PRE-IDENTIFYING PROFILING TARGET
6. 44:10FIX YOUR ERRORS!
7. 44:50CACHING BOTTLENECKS

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