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Last time this came up on Hacker News I discovered SolidWorks 2021 was using an older MKL library that supports the MKL_DEBUG_CPU_TYPE=5 environment variable. I'm on an AMD cpu and measured a small solidworks fps and rebuild time improvement with the flag enabled

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The first comment seems to suggest that flag no longer works.

https://www.agner.org/forum/viewtopic.php?t=6#p82

Multiple versions of MKL dlls exist in the install directory of Solidworks 2021. Indeed, the dlls supporting FloXpress and simulation seem to be the updated MKL version that no longer support the flag. However, the main executable only seems to call sldmkl_parts.dll. It appears to be MKL version 2018.1.156 that does support the flag

It would depend on the version of MKL. If Solidworks has (just for example) statically linked to or bundled in an old version of MKL, then it should work there, still.

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