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I'm running Slackware 12.1 on a DELL Optiplex 755. The system goes slow when I use Aqua Data Studio 4.7.2 to query a database. A simple query takes a long time (from 10 seconds to 2 minutes) and the in the top processes the X appears first using 50% of CPU (100% of 1 CPU).
I can solve the problem usen the vesa driver in xorg.conf but I lose the 3D acceleration. Also I can solve if I install a video card. So I think the problem is with the intel video driver. With Slackware 12.0 I had no problem.
In 12.1's CHANGES_AND_HINTS.TXT I found that XFCE runs slow in some cases, so I've set XLIB_SKIP_ARGB_VISUALS=1 in a script on /etc/profile.d/. I've also disabled the Composite extension in xorg.conf but the problem is still there.
-Intel(R) Core(TM)2 Duo CPU E6550 @ 2.33GHz
-Intel Corporation 82Q35 Express Integrated Graphics Controller
-DELL E178WFP monitor (1440x900 resolution)
Software that makes the system slow
-Aqua Data Studio 4.7.2