Slowdowns, garbled audio, bad performance

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What steps will reproduce the problem?
1.Play any game, for instance Propeller Arena (also seen in Jet Set radio)
2.Either 1x or 2x internal scaling

What is the expected output? What do you see instead?
I expect smooth video and audio, instead at places I get slowdowns that affect 
gameplay, both in video and more annoyingly in audio.

What version of the product are you using? On what operating system?
Demul 0.582
Win7x64 SP1
i5-4670K
750 Ti SC

Either Windowed or Fullscreen

Original issue reported on code.google.com by DogwayTV on 19 Feb 2015 at 1:51

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Original comment by 0vet...@gmail.com on 11 Mar 2015 at 6:38

• Changed state: Invalid

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Elaborate.

Original comment by DogwayTV on 11 Mar 2015 at 6:56