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Subdivision Surface Performance Degrades Markedly With Non-Quad Meshes
Open, Confirmed, MediumPublic


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) triaged this task as Confirmed, Medium priority.

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.