I don't think that's what's going on here. I just happen to notice this in Firefox because I'm a Firefox user. Just to be clear, I'm not saying Firefox is slower than browser X or anything. Does anyone know what's up with this one? Seeing the title and initially glancing at the drawing where it says "reading XUL.dll" I thought they addressed this, as I noticed this problem a while ago and I figured it was something about this multi-process browser experience having to load everything anew or constantly do inter-process communication, but the post is actually about various other performance issues. Screenshot of page with loading graph: Notice the huge gap between HTML loaded and starting to load CSS, for example, where it does not appear to be doing or waiting for anything. Only a third of that is network stuff (DNS resolving, TLS setup, etc. Speaking of Firefox performance, does anyone know what introduces pauses in page loading? A page of 900 bytes HTML, with 2 KB of CSS and a 33 KB background image, takes 918 ms to load.
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