X suddenly started using a lot of CPU (KDE 4.5)

I've been observing this weird issue since few days ago. When some more intensive drawing occurs on the screen (like scrolling through a web page, moving larger windows), KSysGuard shows both of my CPU's to be running at about 50% load. I use only few compositing effects in KWin and even if I disable compositing altogether the CPU usage won't drop.
There is another interesting issue regarding X I've noticed, possibly related. When playing a H264 encoded movie in MPlayer using VDPAU, X uses only few CPU ticks when compositing is disabled. When I enable compositing, X spikes up to about 70%.
I've been using KDE 4.5.0 since it hit testing, so it can't be caused by the update of KDE. KWIn itself doesn't seem to be using any extra CPU ticks, it's just the X which is problematic.
I'm kind of concerned because X definitely wasn't that CPU hungry only few days ago. I was running xorg-server 1.8 and nVidia 256.44 drivers and I updated to xorg-server 1.9 and nVidia 256.52-beta to see if it helps, it didn't:) I'm running custom kernel 2.6.35.4 with ck patchpack and the "desktop responsiveness patch". CPU is C2D T9550 2.66GHz, 4GB RAM and nVidia 9800M GTS.
Thanx for advices...

Xorg 1.9 is in testing. You should expect weird behavior if you enable [testing]
Also: Read this
Continue discussion in the linked thread.
Closing this one to avoid duplication...

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I just realized that I just gave the information for the browser without the extensions that I had installed. Here's the accurate Troubleshooting Information with the extensions:
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Name: Firefox
Version: 26.0
User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:26.0) Gecko/20100101 Firefox/26.0
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Name: Adblock Plus
Version: 2.4
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ID: {d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}
Name: BetterPrivacy
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ID: {d40f5e7b-d2cf-4856-b441-cc613eeffbe3}
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Version: 5.0.6
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ID: {ab4b5718-3998-4a2c-91ae-18a7c2db513e}
Name: Socialite
Version: 1.5.1
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ID: socialite@chromakode
Name: Thumbnail Zoom Plus
Version: 2.6
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ID: [email protected]
Name: Tube Enhancer Plus
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accessibility.typeaheadfind.flashBar: 0
browser.cache.disk.capacity: 358400
browser.cache.disk.smart_size_cached_value: 358400
browser.cache.disk.smart_size.first_run: false
browser.cache.disk.smart_size.use_old_max: false
browser.places.smartBookmarksVersion: 4
browser.sessionstore.upgradeBackup.latestBuildID: 20131205075310
browser.startup.homepage_override.buildID: 20131205075310
browser.startup.homepage_override.mstone: 26.0
dom.mozApps.used: true
extensions.lastAppVersion: 26.0
gfx.blacklist.webgl.msaa: 4
network.cookie.prefsMigrated: true
places.database.lastMaintenance: 1388458622
places.history.expiration.transient_current_max_pages: 100664
plugin.disable_full_page_plugin_for_types: application/pdf
plugin.importedState: true
privacy.sanitize.migrateFx3Prefs: true
storage.vacuum.last.index: 0
storage.vacuum.last.places.sqlite: 1388458622
Graphics
Device ID: 0x 8a0
GPU Accelerated Windows: 1/1 OpenGL
Vendor ID: 0x10de
WebGL Renderer: NVIDIA Corporation -- NVIDIA GeForce 320M OpenGL Engine
windowLayerManagerRemote: false
AzureCanvasBackend: quartz
AzureContentBackend: quartz
AzureFallbackCanvasBackend: none
AzureSkiaAccelerated: 0
JavaScript
Incremental GC: true
Accessibility
Activated: false
Prevent Accessibility: 0
Library Versions
NSPR
Expected minimum version: 4.10.2
Version in use: 4.10.2
NSS
Expected minimum version: 3.15.3.1 Basic ECC
Version in use: 3.15.3.1 Basic ECC
NSSSMIME
Expected minimum version: 3.15.3.1 Basic ECC
Version in use: 3.15.3.1 Basic ECC
NSSSSL
Expected minimum version: 3.15.3.1 Basic ECC
Version in use: 3.15.3.1 Basic ECC
NSSUTIL
Expected minimum version: 3.15.3.1
Version in use: 3.15.3.1

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Been searching a lot and found next to nothing but "reinstall OS X" advice around.
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And out of the blue, my problem returns. Exactly the same symptoms as last time, save for the CPU usage now being 40 - 60 % of one core.
Right clicking the desktop drops the usage down to normal levels in a split second.
I tried killing the process now, and it seems to have worked, but there has to be a better way... Did not remember the advice about safe mode before I killed it, but my guess is that doing that will be like killing the process and probably would fix it for some time.
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semaphoretimedwait_signaltrap 4765
machmsgtrap 3871
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select$DARWIN_EXTSN 1589
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0xe3670 78
0xe3674 14
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0xe366d 9
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0x51e53 6
0xe365e 6
0x51e35 5
0x51e48 5
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Of course there could be something wrong in your code. Can you post an SSCCE that reproduces this behaviour?

X suddenly started using a lot of CPU (KDE 4.5)

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