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Ok. I was able to test it with my viewer. I did not notice any
slowdowns except for the vectorscope which draws a lot of points
(lines) in all directions. In that case the slowdown was from 5
iterations of the vectorscope down to only 3 iterations during
playback. Also, I did not see much improvement in any of my
widgets' antialias except for some round buttons.
Is your vectorscope refresh dominated entirely by the rendering, or is it computationally bounded too? If it is just the rendering time that dominates, it might be worth trying to see if GL would draw it quicker (since the GL path is likely to be using the 3D hardware accel. in the GPU and hence could be "much" faster.) Well, at least on machines with GL support in the hardware of course, though that is pretty commonplace these days.
But it is a lot of work to port the drawing, though...
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