Performance in edit mode is slow moving from 2.79 to 2.8 and up #86341

New Issue

Marc · 2021-03-06T17:42:16+01:00

Marc commented

2021-03-06 17:42:16 +01:00

System Information
Mainrig
R 9 3950x stock
AMD RX 6900 XT stock
32G 3600 c15 memory
Windows 10 Pro, probably latest update as of now.

Slow laptop
i7 6700HQ
Nvidia 960M
16GB memory
Windows 10 Pro latest updates

SSD's in both systems are NVME, one of the later Samsung models.

Blender Version
Broken: 2.8 and up
Worked: 2.79

Specifically tested 2.79, 2.83, 2.91.

Short description of error
Have a relatively low poly model (100k vertices) and do some basic operations like grab, scale, creating faces.
In the old version this is responsive and cpu load is mostly 1-2 cores. Responsive is within 100ms.
In the new version all operations feel sluggish and about 10 cores are loaded. Slow is between 0.3-2s, basically unworkable for higher vertex models.

Also things like sculpting are really fast even when going to really high vertex counts. It is not my system or a driver since I tested 2 systems.

Exact steps for others to reproduce the error
See my stackoverflow post for more details:
https://blender.stackexchange.com/questions/210296/edit-mode-2-91-very-slow-and-cpu-intensive-compared-to-2-79

One of the blend files in question, if more are needed I will add those:
https://nighteyes.stackstorage.nl/s/80BzHF6aMub3zRdZ

**System Information** Mainrig R 9 3950x stock AMD RX 6900 XT stock 32G 3600 c15 memory Windows 10 Pro, probably latest update as of now. Slow laptop i7 6700HQ Nvidia 960M 16GB memory Windows 10 Pro latest updates SSD's in both systems are NVME, one of the later Samsung models. **Blender Version** Broken: 2.8 and up Worked: 2.79 Specifically tested 2.79, 2.83, 2.91. **Short description of error** Have a relatively low poly model (100k vertices) and do some basic operations like grab, scale, creating faces. In the old version this is responsive and cpu load is mostly 1-2 cores. Responsive is within 100ms. In the new version all operations feel sluggish and about 10 cores are loaded. Slow is between 0.3-2s, basically unworkable for higher vertex models. Also things like sculpting are really fast even when going to really high vertex counts. It is not my system or a driver since I tested 2 systems. **Exact steps for others to reproduce the error** See my stackoverflow post for more details: https://blender.stackexchange.com/questions/210296/edit-mode-2-91-very-slow-and-cpu-intensive-compared-to-2-79 One of the blend files in question, if more are needed I will add those: https://nighteyes.stackstorage.nl/s/80BzHF6aMub3zRdZ

Marc commented

2021-03-06 17:42:16 +01:00

Added subscriber: @Sp3ci3s8472

Eugene Du commented

2021-03-06 21:52:13 +01:00

Added subscriber: @APEC

Eugene Du commented

2021-03-06 21:52:13 +01:00

Here is the task
https://developer.blender.org/T73360
But it seems not in priorities

Here is the task https://developer.blender.org/T73360 But it seems not in priorities

Philipp Oeser commented

2021-03-06 22:26:28 +01:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2021-03-06 22:26:28 +01:00

Yes, this should be handled by #73360 (Fast highpoly mesh editing), feel free to continue discussion there [you might also want to share your findings from stackexchange there]

Philipp Oeser commented

2021-03-06 22:26:42 +01:00

Closed as duplicate of #73360

Philipp Oeser closed this issue

2021-03-06 22:26:42 +01:00

Marc commented

2021-03-06 23:25:04 +01:00

Thanks for pointing me there!

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Performance in edit mode is slow moving from 2.79 to 2.8 and up #86341