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Mean crease interaction is very slow with subdiv modifier
Open, Needs Triage by DeveloperPublic

Description

System Information
Operating system: Linux-3.10.0-957.10.1.el7.x86_64-x86_64-with-centos-7.6.1810-Core 64 Bits
Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 418.56

Blender Version
Broken: version: 2.80 (sub 75), branch: master, commit date: 2019-07-29 14:47, hash: rBf6cb5f54494e
Worked: 2.79 any

Short description of error
The operation of mean crease (shift+e) lags a lot, when the subdiv modifier is used.

Exact steps for others to reproduce the error
Open the attached file.
Go into edit mode.
Select an edge loop.
Do shift+e (or mean crease in the N panel) and drag back and forth.

CPU overloads and fps drops drastically.

Details

Type
Bug

Event Timeline

I can confirm that this is much slower than it should be, but I'm not sure if this is a bug...
The profiler reveals that most time is spent in opensubdiv code.

Yegor (Yegor) added a comment.EditedSun, Aug 18, 11:30 PM

By the way, not only that. A couple of subdivisions can lag a lot while mesh editing. 2.79 doesn;t suffer from that. A lot of people complain about subdiv performance on editing.
Don't know if it's related, but seems so.