Task scheduler: don’t freeze the tab when opening a page
summary
Describes Yandex’s task scheduler used to initialize search-page scripts without blocking the UI, reducing Total Blocking Time (TBT). Explains the problem of large TBT on page load (independent of frameworks) and shows how to lower TBT using a scheduler approach while keeping other metrics intact, plus guidance for implementing the same technique.
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chapters (14)
- 0:00Welcome
- 2:11Speaker background
- 3:37Event Loop performance
- 9:54Long Tasks on JS init
- 12:06Legacy search init
- 16:30Task splitting with setTimeout
- 21:27setTimeout delays specifics
- 24:40Smart scheduler: merging & prioritization
- 29:14postMessage vs setTimeout
- 34:36postMessage optimization with MessageChannel
- 38:36Existing init speed solutions
- 44:23React updates & native APIs
- 49:40Native schedulers in Chrome/Firefox
- 50:00Conclusion & Q&A
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