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Maniphest T63887

Undo takes 5 seconds, even on simple scenes.
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Description

System Information
Operating system: macOS Mojave 10.14.2
Graphics card: Radeon Pro 560X 4096 MB
Intel UHD Graphics 630 1536 MB

Blender Version
Broken:
2.80, 1b839e85e142, blender2.8, 2019-04-25
Download file is blender-2.80-1b839e85e142-OSX-10.9-x86_64

Short description of error

Undo takes a LOT of time on those tasks:
If I move an object and undo, resize and undo.
If I change something in a shader.
If I delete an object and undo.
When I undo a paint in Weight Paint, Vertex Paint and Texture Paint.

This doesn't happen on:
Sculpt Mode and Edit Mode.

Jacaré Man2.blend5 MBDownload

Exact steps for others to reproduce the error
Based on the default startup or an attached .blend file (as simple as possible).

Do some of those tasks to see how it slows down on specific actions.

Related Objects

Event Timeline

Gabriel Moro (gabrielmoro) created this task.Apr 25 2019, 8:08 PM
Sven Stein (HADESBLACK) added a subscriber: Sven Stein (HADESBLACK).Apr 26 2019, 2:51 AM

Can confirm that Undo actions are very slow. The only way to get around it is by using the Undo History if you want to go back several steps.

Sebastian Parborg (zeddb) assigned this task to Sergey Sharybin (sergey).Apr 26 2019, 2:50 PM
Sebastian Parborg (zeddb) lowered the priority of this task from 90 to 50.
Sebastian Parborg (zeddb) added subscribers: Sergey Sharybin (sergey), Sebastian Parborg (zeddb).

It is slow because of the subdiv modifiers. @Sergey Sharybin (sergey) would it be possible to keep the subdiv cache on undo (if nothing has changed mesh wise)?

Sergey Sharybin (sergey) added a comment.Apr 26 2019, 2:58 PM

@Sebastian Parborg (zeddb), that is not possible since undo equals to re-opening the file from scratch. There is nothing you can preserve between global undo steps.

The only way to solve the issue is to speed up topology refinement step. However, this requires changes which are being worked on from OpenSubdiv side.

We've got other reports about Subsurf Modifier performance, will merge this one to them.

Sergey Sharybin (sergey) closed this task as a duplicate of T58191: Subdivision Surface modifier performance issues.Apr 26 2019, 2:58 PM
Gabriel Moro (gabrielmoro) added a comment.May 5 2019, 3:22 AM

This is still happening even when objects don't have the Subsurface Modifier. Even if none of the objects in the project have it... And on those same tasks I said previously. Undo still works on Edit Mode and Sculpt Mode.