Browser Support • Re: Why is Pale Moon so slow?

For me the biggest offender is youtube.

But of course both youtube and Chromium are made by Google…

And here's the crux, exactly. Youtube has always been developed in very close proximity to Chrome ever since Google bought it. It's been a vessel to push Chrome dominance as well, and yes, for years now there have been scripting chunks in Youtube's UI code that run like tar on anything but Blink. Reports about negative performance impact were ignored (and probably seen as leverage so allegedly "not fixed on purpose") because Blink was fine. And its market share kept growing as a result.