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Texture painting smear and soften brushes lag
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System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 1050 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 442.19

Blender Version
Broken: version: 2.82 (sub 7), branch: master, commit date: 2020-03-12 05:06, hash: rB375c7dc4caf4
Worked: (optional)

Short description of error
Texture painting smear and soften brushes lags i also tried it in a new file on the default cube and the same problem occurs

Exact steps for others to reproduce the error
Add a texture painting slot set base color to 4096 by 4096 normal brush works fine but Smear and Soften brushes lag in 3d view port and in image editor

Related Objects

Event Timeline

I can confirm, but unfortunately this is not a bug.
Smear and soften operations on high quality textures are CPU intensive.
And that can slow things down.

But we are aware of this problem.
It is under discussion in T63745: Sculpt, Paint, Texture Module

  • ? Texture Painting: Performacne improvements to the Soften tool