If you've noticed Flash video being a bit choppier than usual, it might be because of the recent patch - the one from last week:
Prior to this patch, on my laptop with Optimus the dedicated GPU would turn on whenever I played a video. You could enable or disable hardware accleration in the settings panel.
With the updated Flash build, the option is no longer there and as a result videos are offloaded onto the GPU (read: choppy).
Just seeing if others notice something similar. You can uninstall last week's update by going into "View Installed Updates."