[gorhill]

It's perfectly fine and valid to question the pile of JS code executing in Youtube webpages, but in this specific instance the performance issues are caused by ABP/AdBlock. The issue has been acknowledged by the developers[1]. It affects only the latest version of both blockers, not previous versions, so it makes no sense to keep speculating Google is at the root of that specific issue.

Out of curiosity I investigated these performance issues myself using profiling sessions[2] and the faulty code is definitely in the latest versions of these extensions.

* * *

[1] https://gitlab.com/adblockinc/ext/adblockplus/adblockplusui/...

[2] https://twitter.com/gorhill/status/1746543688975581604

[inferiorhuman]

  in this specific instance the performance issues are caused by ABP/AdBlock

Welp I use uBO not AB/ABP and Youtube's been acting up for me for a few days.

[pixxel]

As always, thank you.