Choppy full screen video playback (only with flash player)

Aug 21, 2001
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Hey guys I am having a problem with my full screen video playback on youtube and a few other streaming sites. When the video is small it runs very smooth, but in full screen its very choppy. I have tried to update my video drivers and I have updated the flash player as well. Could it be a bug with my setup, or is there something that I am missing.

My setup:
Intel Quad Core Duo Q6600
2GB Geil Ram
Geforce 7800GS
Latest Nvidia drivers
Latest flash

Any advice would be a great help.
Thanks
-Yueng