Choppy video playback with Adobe?

I've had very choppy video playback on my computer for the longest time but only with sites and services that use Adobe Flash Player such as YouTube. It seems to have been a problem for the last year or so with the various upgrades of Flash but Adobe never seems to get it fixed.

I was using Adobe Flash ver 11. something and the only way I could address this was to uninstall it and go all the way back to one of the ver 10.0 builds. I now have great playback but every time I go to a site with Adobe Flash it tells me my version is out of date so I just "allow" it and carry on.

Has anyone else been able to figure out what is going wrong with Adobe Flash and how you can run the latest version and still get good video playback? It seems to be an Adobe problem but perhaps I have missed something and my Adobe can be upgraded provided I upgrade something else. Nothing on the Adobe website seems to talk about this problem but it's all over other forums.

Any suggestions?