Ok here is my unscientific speed tests. Same 4K HDR file. The first one is the x265 provided by staxrip 2.0.8.0
x265 3.3+2-gbe2d82093 GCC 9.2.0
2.40 fps
x265 3.3+10-g08d895bb6-gcc9.3.0
2.45 fps
x265 3.3+10-g08d895bb6-msvc-vs2019
2.34 fps
x265 M-3.3+10-g08d895bb6-gcc9.3.0
2.51 fps
x265 M-3.3+10-g08d895bb6-msvc-vs2019
2.30 fps
So gcc seems faster than msvc.
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