KDE intermittent freezes for ~1 second

Update: It would be really helpful If someone could kindly let me know if they are *running KDE, *using high resolution/multi head, *using many windows, *using an ATI card, *have desktop effects on, *not experiencing any trouble.
Hi, when I have a lot of windows open in KDE, the desktop sometimes freezes for about 0.5-5 seconds when I move, resize or unmaximise some windows, and sometimes just when bringing them to the foreground. Firefox and Thunderbird seem to be especially bad, but it happens for all applications. The system is not under great load, and there is plenty of free RAM. The system does not completely lock up, as the sound continues playing. Mouse events from when it's locked up are lost. When it's not locking up, everything is super smooth. Are anyone else seeing this?
I suspect the problem may be that the graphics memory is full. I have dual monitors, one 1920x1200 and one 1280x1024. I have a Radeon 6770 card with 1 GB GDDR5 memory, and I'm using the open source driver. I've enabled PCIe 2.0 mode for the radeon using a kernel parameter. I've tried all options under Desktop Effects in KDE (I don't think it's a problem when it's all disabled, but I'm addicted to the window switchers). I have measured my main RAM memory bandwidth to be something like 14 GB/s, which is less than the top end systems, but not insanely bad.
If my impression of the Arch community is right, this would be the place where someone may have encountered it and fixed it... (I had the problem on Fedora as well though). Also, do you think this would be better with an integrated GPU, where the system memory and graphics memory is shared? (then I would have to sell my CPU and get a new one) Would it help to upgrade from 1333MHz to 1600MHz RAM?
Update 2: I don't see the trouble to such a large extent in Gnome
Last edited by fa2k (2013-02-06 23:41:27)

So there was slowness in both Gnome and KDE. It has been annoying me for over a month now, but now it's solved!!
The solution is embarrasingly simple: Use the proprietary driver. The improvement in a "Firefox" test in the Phoronix test suite is almost a factor of 10. http://openbenchmarking.org/result/1302 … AIROATTE26 . This is also what it feels like. It is just amazingly awesomely much much better

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Hi,
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          Apple Inc. BRCM2070 Hub
                    Apple Inc. Bluetooth USB Host Controller
          Apple Inc. Apple Internal Keyboard / Trackpad
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Hi,
You don't need iChat.
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If the iCon in the DOCK looks like this then it is linked to iChat 4.
You should be able to Right/Control click that and get it to "Show in Finder"
Messages looks like this .
Launch Messages and set Bandwidth (Same place with the Preferences)
7:45 PM Thursday; September 20, 2012
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
 iMac 2.5Ghz 5i 2011 (Mountain Lion 10.8.2)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
 Couple of iPhones and and iPad
"Limit the Logs to the Bits above Binary Images."  No, Seriously

KDE intermittent freezes for ~1 second

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