Possible Duplicate:
Why are Flash applications so sluggish in Ubuntu?
Lately ALL my videos are jerky (using 10.04)...I have a Nvidia 5200 card with driver 173...All videos are getting worse than when I first loaded 10.04 on my computer...I don't understand why...??? Robert
What is your CPU and are you using the x64 version of Ubuntu? And is this jerkiness repeated on all Flash video sites?
As a temporary solution, you might want to consider switching YouTube to HTML5 <video> mode using this page, but you will almost certainly need to install Google Chrome for it to work.
