The "Add Grain" filter performs so poorly that I'm wondering if it was written in the 90s and never touched again. On a very short composition with a few other adjustment layers, doing a RAM preview takes about 20 seconds. If I enable the adjustment layer that has the grain filter, each frame takes like 3 or 4 seconds and the whole composition takes about 3 minutes to render. This is on an i7 3930k with 32 GB of RAM which flies on anything else. Looking at the task manager, when it's rendering it doesn't even get to 10% CPU, so I'm guessing it's a very poorly coded filter, unless it's using only the GPU, but when anything uses the GPU I can feel its fan revving up, and it's not the case here. This is with CS6 by the way.
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