I'm Running Sabayon6 KDE Edition with KWin as the Window Manager.
Screenshot of my Desktop (Size may be big): http://i.min.us/idIZni.png
The screenshot wasn't necessary but it helps to explain things some what.
Anyway, when ever I try to move my mouse at the bottom right hand corner of the screen...just touching task bar @ right hand corner....my mouse along with all other activity stops for like 1second. Whether I'm playing a video, even the video's frame would like hang for 1s along with my mouse...but the sound isn't affected when I'm playing music, etc.
Also in my previous Sabayon install the taskbar was at the top...but I still had this problem...so this is probably not related to the taskbar itself..and only related to that part of the area.
I don't know whether it's a fault with my hardware, graphics card or driver...but when I used Sabayon for the first time few months ago there was no such problem. Even on KDE it wasn't there but recently like a few weeks back I started noticing this...so I made a fresh install of Sabayon6 just so I could get rid of this problem...but even after a fresh install it simply doesn't go away!
When I move mouse on the task bar in general there's no such problem, it only happens when I try to move my mouse on the bottom right hand corner.
I have Ati Radeon HD 5450 with amdcccle installed, and I enabled "Tear Free Desktop" option if that makes a difference.
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$ eselect opengl list Available OpenGL implementations:  ati *  nvidia  xorg-x11
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$ uname -a Linux core 2.6.39-sabayon #1 SMP Wed Jun 15 22:52:37 UTC 2011 i686 Intel(R) Core(TM)2 Duo CPU E7500 @ 2.93GHz GenuineIntel GNU/Linux