Hey guys.

RJ's change to a singleton 30fps timer for the GUI in r2527 of the 1.8 
branch is a great design move.

I did find two problems as a result that now need fixing:
- The main waveform apparently generates one chunk per timer tick, so it 
takes ALOT longer for the main waveform to render. This needs to be spun 
off to a separate worker thread so it can run at maximum speed. (Extra 
points for calculating the summary waveform in parallel.)
- 30fps is not as smooth as before the change using 1ms latency. 
Changing it to 40fps looks much better, so I recommend that be the default.

Sincerely,
Sean M. Pappalardo
"D.J. Pegasus"
Mixxx Developer - Controller Specialist

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