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Changing brush size causes lag.
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Description

System Information
Operating system: Linux-5.3.0-18-generic-x86_64-with-debian-buster-sid 64 Bits
Graphics card: GeForce GTX 970/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 435.21

Blender Version
Broken: version: 2.81 (sub 16), branch: master, commit date: 2019-11-07 20:33, hash: rBeefd806afc15
Worked: (optional)

Short description of error
Lags when brushes size change.

Exact steps for others to reproduce the error

  1. Please open the attached file.
  2. Please Sculpt ( clay strips already active ) on the model about 2 time.
  3. Press F and change brush size . ( lag about 1 sec)
  4. But can change the brush sizes without any lag after that.

5.Then sculpt about 2 times on model
6.Then press F and change brush size --- lag again.

  1. Many brushes have similar error.

8.Blender 2.8 had no similar error.

  1. I used Dyntopo with brush detials. Other sculpting experience is very good. Amazing. Much better than Zbrush Sculptris mode.

Attached Blender file.