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Solution for reducing Choppiness in rendering on MouseMove

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The choppiness is due to the way the effect rendering is done in background threads. Whenever you change a parameter of the effect, we have to notify the background threads to stop, wait for them to tell us that they've stopped, and then restart them with new parameters. Those first stop (notify + wait) are what causes the choppiness since we have to wait for it to finish rendering the current chunk. On large images this can take a significant amount of time (where "large" is dependent on the performance of the system).

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