<div class="gmail_quote">On Sat, Sep 5, 2009 at 11:13 AM, Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>> wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> As firefox uses cairo for these elements, the graphics performance should be directly comparable between linux and win32. Furthermore, it remains in my interest to fix any cairo performance problems. :-) -ickle </blockquote></div> For some reason, at least in ubuntu 9.10 where I did sysprof, firefox spens a lot of time in various fontconfig functions during the operation of selecting text. This may evict some cache and make GPU operations even slower. Open source Radeon r500 driver does this much faster, maybe because the computer has a discrete Radeon 1950Pro, or maybe because it has more cache on the CPU (2MB vs 4MB).