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Autosmooth + Custom Normals is slow
Confirmed, NormalPublic

Description

System Information
Operating system: Windows 10
Graphics card: Nvidia mx230

Blender Version
Broken:
master

Short description of error

Using autosmooth and custom normals at the same time is slow, even in situations where you wouldn't
expect normal calculation to happen (like moving an object in object mode).

Exact steps for others to reproduce the error

  1. Load the .blend file. Move the object around, it should be slow.
  2. Either disable autosmooth, or clear custom split normals.
  3. Moving the object should now be a lot faster

Event Timeline

Pratik Borhade (PratikPB2123) changed the task status from Needs Triage to Confirmed.Tue, Jun 1, 6:20 AM

Hi @Joseph Eagar (joeedh) , I can confirm the report. It is reproducible since 2.92.0 (Hash: rB02948a2cab44, commit date: 2021-02-24). Not tested for other versions (< 2.92.0)

I assume tag would be modelling here? Correct me If I am wrong :)