How long does your second pass take? If it's at least as long as the first pass, you're likely gated by source reading or processing somehow. If that's the case, the passes should take around the same amount of time, but the second pass would show higher CPU use. Maybe something that used to happen in hardware is now in software after your reinstall?
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Ben Waggoner
Principal Video Specialist, Amazon Prime Video
My Compression Book
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