FASTER ROTOBRUSH & PENCILS.
You could accelerate by GPU the rotobrush tool. And all the pencils in general.
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Paul Roper commented
GPU or multi-core processing for this would be amazing! I know it's doing a lot of calculations, but it's currently SO slow.
Jakob Eriksen commented
Roto brush v2 is major game changer. That is why it is so important that adobe fixes all the bugs. This need to be reliable even on long sequences with highres footage. It is important to have the ability to have a rotobrush v2 sequence to render overnight to extract a mask, without memory leaks an craches.
Rotobrush code should be optimised for GPU.