Operating system: Windows-7-6.1.7601-SP1 64 Bits
Graphics card: GeForce GTX 660 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 456.71
Broken: version: 2.92.0 Alpha, branch: master, commit date: 2021-01-09 14:02, hash: rB6154aa1529b7
Worked: 2.91 release
Short description of error
I am trying to use mask modifier with hi-poly mesh in sculpt mode. And it looks like it recalculates each time, despite topology do not change.
Take file apply subdiv and compare sculpt speed with and without mask modifier.