When I upgraded to FC5, I noticed that Firefox was especially slow. I solved it by using this: export MOZ_DISABLE_PANGO=1 After updating firefox to 1.5.0.4 via yum recently... Firefox is now back to being really sluggish and irritating to use (on a AMD XP 2000+, 512Mb RAM, with a Matrox G550 card). Has this non-Pango option now been removed? It would be very irritating if it has, since FC5 and the use of Cairo for GTK, my GTK/GNOME apps have all been appalling to use. The apps redraw like an old 486 with Windows 3.x. The few Qt apps I run are unaffected. Frankly, it's embarrassing to show to others.