Safari poor performance since update

[Nexus]

Is anyone else finding poor performance with Safari since its latest software update?

Trying to play videos on YouTube for example ends up with them stuttering and freezing half the time. I've noticed this on my 2008 MacPro and my 2010 MacBookPro.

For reference I had no issues before the update and Firefox still plays videos like normal.

 

[Nexus]

My Flash is all up to date.

I worked out that it appears to be just HTML5 videos on YouTube that were problematic. I left the trial and it all works fine again with Flash videos.

 

[Nexus]

As I said above, its just the HTML5 performance I was finding a problem with on YouTube. No issue with it in Firefox and having opted out of the trial so that YouTube now only shows Flash videos, its fine again.