I would definitely use CTU 64 at 1080p and above, also the new HME method to improve the search range with a smaller impact on performance. At 1080p or higher resolutions, CTU 64 should already cause enough work for the encoder to utilize the CPU much better than at 720p or lower so there should be no need to go to CTU 32.
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And if the band you're in starts playing different tunes
I'll see you on the dark side of the Moon...
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