[Cin] Multitrack performance issues

[Stefan de Konink via Cin]

I think have a significant opportunity to improve the Cinerella performance, under normal editing conditions, by n_videotracks-fold. At this point in time I notice that the CPU usage (decoding) for a section where multiple tracks are stacked, but only the top one is actually on screen (read opacity 100%) could be improved.

I observe the following:

 - for a disabled video effect, the CPU still runs
 - for stacked video, the CPU still runs for both videos
 - the effect must be detached and the video below must have play track
   disabled to prevent the CPU to go from 20% to 150%
 - this is independent of colourspace (RGB, RGBA, YUV or YUVA)

--
Stefan

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