kwin CPU usage and slow window switching with KDE 4.10.5

[cazort]

Just upgraded KDE to 4.10.5 from 4.9.x and I'm noticing two things:

• Noticeably slower window switching. I.e. when clicking on a new window, the focus moves immediately, and the window moves to the foreground, but there's a visible delay between
  
• Huge CPU usage by kwin during switching...as high as 51% CPU.
  
• The lag makes it so I can't rapidly alt-tab switch between windows. If I hit tab twice rapidly, it only changes once.
  

Any idea how to troubleshoot this? It's a huge performance issue as it's affecting functionality.
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Alex Zorach | Teacology | RateTea | Why This Way

[cazort]

I found this bug which linked to this bug, and gave a workaround, setting Qt graphics system to Raster in the configuration...but...that was already set on my box. Fiddling with the settings there didn't seem to change anything either...still very slow.
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Alex Zorach | Teacology | RateTea | Why This Way