Comment 1 for bug 1280938

Can you please elaborate on which platform, graphics card, and what setup exactly are you using when taking the screencast (which server and clients). I want to try to reproduce locally. In previous experiments on intel hd graphics 1280x800 compositing wasn't affected at all (although 1900x1200 is over twice as large).

> -rawvideo fps=60:w=1920:h=1200:format=bgra

I doubt that we are capturing at 60 fps, buf if we are that could be the problem (too much for the hardware, so we may need to add support for throttling).