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Upgrade the memory of your 2020 iMac up to 128GB
Upgrade the memory of your 2018 Mac mini up to 64GB
Mac Pro Westmere Performance with Handbrake Video Encoding
See test machine configuration.
Handbrake [download] scales well to about 8-9 cores, but that’s about it. See Optimizing Handbrake.
The 12-core is about 20% faster than the 6-core, because Handbrake uses only about 9 cores.
Handbrake encode to MPEG-4
Beta build vs regular
The August 30, 2010 build is about 9% faster than the 0.94 release version.
Handbrake encode to MPEG-4,using 12-core 3.33GHz Mac Pro
These are the settings used for testing.
Settings used for encoding