i have 2 profiles, one on firefox version 24 for a few reasons, download window, old school search bar, faster
another profile is latest version of firefox for newer viewing compatibility, which I sometimes use chrome too if both firefox doesn't work.

issue is, on firefox 24, its faster compared to latest versions of firefox (even on clean profile) and to reproduce issue is rather simple. don't maximize window and drag firefox window around the screen and watch CPU usage spikes up.

for firefox 24 the usage doesnt go up at all but on latest versions of firefox (pretty much anything after ffox 26) if drag the window around for even 5sec CPU usage will spike like crazy, like its trying to render graphic or something with CPU. for both versions I have hardware acceleration disabled already so I don't think its that.

anyone know whats going on?