Youtube videos are stuttering on safari?

Hi,
When I play youtube videos on safari, it seems to stutter/shake every 1-2 seconds.
Audio works fine but video itself is just constantly shaking.
When I play videos on other sites (vimeo, dailymotion), it works fine. Only happens on youtube
I've restarted computer, cleared safari history/cache, uninstall/reinstalled adobe flash player. Still no luck
Using OSX Mavericks
Much help appreciated.
Cheers

ADRIAN0, I do not understand what you mean by "and these NVIDIA graphics card??".
- The 2011 and 2012 Minis have Intel HD graphics integrated into the CPU.
- The 2010 has NVIDIA GeForce 320M
- The 2009 Mini has Nvidia GeForce 9400M
- The 2006 and 2007 have Intel GMA 950

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