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Multires clay brushes performance issue
Confirmed, HighPublicBUG


System Information
Operating system: Linux-5.4.0-42-generic-x86_64-with-debian-bullseye-sid 64 Bits
Graphics card: Quadro GP100/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 440.100

Blender Version
Broken: version: 2.90.0 Beta, branch: master, commit date: 2020-08-02 18:54, hash: rB0264f53e30c7

Short description of error
When using the multires modifier for sculpting the performance seems to suffer significantly for certain brushes. This gets even worse on lower levels so the performance often is much worse on level 1 when compared to level 3.

The performance seems to be especially bad on the Clay & Clay Strips brushes.

Example .blend file

Just to make sure the performance is as reproducible as possible, here is the file of the jacket.
When trying to reproduce this performance on a cube or Suzanne head it wasn't as bad but still noticeable.

Event Timeline

Not sure if this is the cause of the issue, but in my computer (i7 9750H, 16GB, GTX1650 4GB) D8442 seems to fix the issue:

With 10k leaf limit:

With 1k leaf limit:

Pablo Dobarro (pablodp606) changed the task status from Needs Triage to Confirmed.Aug 3 2020, 5:23 PM
Pablo Dobarro (pablodp606) triaged this task as High priority.
Pablo Dobarro (pablodp606) changed the subtype of this task from "Report" to "Bug".