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Subdivision Surface Performance Degrades Markedly With Non-Quad Meshes
Confirmed, NormalPublicKNOWN ISSUE


System Information
Operating system: Windows 7 Pro X64
Graphics card: Nvidia Geforce GTX 980 Ti

Blender Version

Broken: Date: 2019-01-21

Hash: dd3f5186260e
Branch: Blender 2.7 (although it's supposed to be a 2.80 Beta)

Short description of error

Subdivision surfaces are fast and responsive in Edit mode with all-quad meshes, but very slow (~ 10x slower) with meshes comprised of triangles and quads.

Exact steps for others to reproduce the error

Open the attached blend file and select Cube.001

Go into Edit mode. Turn on Proportional Editing. Grab a point and move it - observe how responsive the viewport is with the all-quad mesh.

Go back to Object Mode. Select Cube. Go back into Edit Mode. Grab a point and move it (with proportional editing still turned on) Observe how slow it is.

Event Timeline

Philipp Oeser (lichtwerk) lowered the priority of this task from 90 to 50.

Will leave these reports separate for now [even though quite similar]

Agreed - it's very likely it's the same underlying cause. FWIW, I didn't see the same behavior in 2.79, so it's something new.

Just a simpliest demo

There are no real news. As soon as there are any they'll surely be mentioned here.