Comment 315 for bug 125970

(In reply to comment #166)
> On Linux, it's quite likely that our "sensitivity" is because we use cairo's X
> backend (i.e. depend on Xrender and friends), but other browsers do their
> rendering in software and just send over complete bitmaps.

Not true, WebKitGTK does the whole rendering in Cairo too and it's ten times faster than Firefox on Linux (but less stable). Take a look at Midori and compare the rendering speed and zoom speed.