1080 60p AVCHD choppy only under Mountain Lion

1080 60p AVCHD .m2ts and .mov video playbacks, using VLC and QuickTime are choppy only under Mountain Lion.
The same videos used to playback smooth with VLC and QuickTime under 10.6.8 Snow Leopard and Sony PMB under BootCamp/XP so my 27" iMac with 12GB RAM and 512MB video RAM is not the problem.
Anyone has a solution to this? I'm thinking about going back to 10.6.8 Snow Leopard via TimeMachine.
Is there a way to assign more RAM to QuickTime, iMovie, VLC, or other media players since out of the 12GB RAM only 160MB was assigned to VLC and QuickTime during playback.
Thanks for your help!

These discussions show that the same video-playback problems started with Lion even on 2011 i7 27" iMac and continues to ML:
https://discussions.apple.com/message/16160679#16160679
https://discussions.apple.com/thread/3204054?start=0&tstart=0
I'm definitely going back to Snow Leopard and run Mountain Lion from a separate partition only when I need the ML-only Apple eBook app.

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