From what I've been able to gather, Adobe Flash Player plugin appears to be incompatible with certain graphics cards on Macs and PCs. This may only be part of the problem with poor Flash video rendering and cpu intensive behavior.
I would encourage all to register and vote on the FP-890 Adobe bug issue board
http://bugs.adobe.com/jira/browse/FP-890 vote on this issue
http://bugs.adobe.com/jira/browse/FP-2600
http://bugs.adobe.com/jira/browse/FP-2111
I would encourage all to register and vote on the FP-890 Adobe bug issue board
http://bugs.adobe.com/jira/browse/FP-890 vote on this issue
http://bugs.adobe.com/jira/browse/FP-2600
http://bugs.adobe.com/jira/browse/FP-2111