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Speed up composite ROP?

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I have a comp ROP (launched within the Houdini UI) that takes >1 hr, but I see only 20% use of my CPU. Is there way to use more CPU to speed up the comp? In Preferences->Cooking->Multithreaded Cooking is set to 14 (out of 16), but I don't see CPU usage above 20%. In Compositing Settings, I tried dropping bit depth to 8-bit integer (from 16-bit FP), but it doesn't make any difference. I tried "Batch Cook Frames" set to 2 and up, but it slows down the comp even more. My comp uses only individual frames (no time warps etc), so it should be easy to parallelize it to the max (one frame per thread)

Edited by guache

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