$ rpm -q kernel kernel-3.2.3-2.fc16.x86_64 kernel-3.2.2-1.fc16.x86_64 kernel-3.2.5-3.fc16.x86_64 Each kernel prior to kernel-3.2.5-3.fc16.x86_64 performed kwin desktop effects and compositing quite well. Now, there's are noticeable delays all over the place, sometimes as long as several seconds to min/max windows, draw menus, etc... http://www.smolts.org/client/show/pub_e0f76fc1-43db-4621-afa3-24a946fac413 in particular uses, Intel Corporation Mobile 945GM/GMS/940GML Express Integrated Graphics Controller
$ dmesg | grep i915 [ 1.341303] i915 0000:00:02.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16 [ 1.341389] i915 0000:00:02.0: setting latency timer to 64 [ 2.308605] [drm] Initialized i915 1.6.0 20080730 for 0000:00:02.0 on minor 0
3.2.3 added these i915 commits.. 04115a9dee110b52a8eaa556c574022fa3bf4704 ba68e086223a5f149f37bf8692c8cdbf1b0ba3ef
OK, seems this is at least partly a problem of my own making, was testing workarounds for some odd focus issues in kdm (bug #631767), and added to kdmrc GrabServer=true and in this greatly impacts compositing performance as a side-effect apparently (just a bit less noticeable on the older kernels). so, let's just take that off the table, and consider this bug self-induced for now.