Viewport in blender lags due to the GPU under-utilization #51349

New Issue

Ludvik Koutny · 2017-04-29T11:22:52+02:00

Ludvik Koutny commented

2017-04-29 11:22:52 +02:00

System Information
Windows 10, GTX970 - latest drivers

Blender Version
Broken: 2.78c

Short description of error
Viewport in Blender lags at the start of every operation, be it viewport navigation or editing. This happens on very high end computers, such as mine. The lag occurs for about 0.5 seconds at the start of every operation, and happens due to the GPU constantly going to the idle mode and waking up when idle is interrupted by an action performed in Blender. This results in indescribable amounts of extreme frustration, feeling that the entire Blender is constantly laggy.

What resolves this issue is running some other software at the same time with Blender, which utilizes GPU at least a little bit, for example other 3D package, video player or OBS screen recorder.

This is, however, a ridiculous workaround. Needing to have a 3rd party software bloating computer utilization just to keep Blender alive is really not a good way to go about it.

Exact steps for others to reproduce the error
Reproduction of this is very tricky, as it requires high performance Windows desktop PC that has been well maintained and therefore has no bloatware running in the background.

Once these conditions have been met:
1, Run Blender after fresh start of Windows with no 3rd party programs running in the background
2, Open scene containing high poly mesh, at least 500k poly in one mesh object.
3, Try to perform basic viewport navigation - pan, orbit, zoom, etc...
4, Observe short lag at the start of every operation
5, Launch any software that utilizes GPU at least a little bit
6, Watch the lag instantly disappear

Solution: Blender needs to have some internal mechanism/routine to prevent GPU from constantly idling while the Blender is running.

**System Information** Windows 10, GTX970 - latest drivers **Blender Version** Broken: 2.78c **Short description of error** Viewport in Blender lags at the start of every operation, be it viewport navigation or editing. This happens on very high end computers, such as mine. The lag occurs for about 0.5 seconds at the start of every operation, and happens due to the GPU constantly going to the idle mode and waking up when idle is interrupted by an action performed in Blender. This results in indescribable amounts of extreme frustration, feeling that the entire Blender is constantly laggy. What resolves this issue is running some other software at the same time with Blender, which utilizes GPU at least a little bit, for example other 3D package, video player or OBS screen recorder. This is, however, a ridiculous workaround. Needing to have a 3rd party software bloating computer utilization just to keep Blender alive is really not a good way to go about it. **Exact steps for others to reproduce the error** Reproduction of this is very tricky, as it requires high performance Windows desktop PC that has been well maintained and therefore has no bloatware running in the background. Once these conditions have been met: 1, Run Blender after fresh start of Windows with no 3rd party programs running in the background 2, Open scene containing high poly mesh, at least 500k poly in one mesh object. 3, Try to perform basic viewport navigation - pan, orbit, zoom, etc... 4, Observe short lag at the start of every operation 5, Launch any software that utilizes GPU at least a little bit 6, Watch the lag instantly disappear Solution: Blender needs to have some internal mechanism/routine to prevent GPU from constantly idling while the Blender is running.

Ludvik Koutny commented

2017-04-29 11:22:52 +02:00

Changed status to: 'Open'

Ludvik Koutny commented

2017-04-29 11:22:52 +02:00

Added subscriber: @Rawalanche

Brecht Van Lommel commented

2017-04-30 02:18:22 +02:00

Added subscriber: @brecht

Brecht Van Lommel commented

2017-04-30 02:18:22 +02:00

Which exact driver version are you using? Have you tried installing the latest NVidia driver from nvidia.com?

There is a bug in some NVidia driver versions auto updated by Windows 10, which we are tracking in #50650. Reports indicate that it is fixed when downloading a newer driver. Keeping the GPU constantly busy would be bad for power consumption, not an acceptable solution I think.

Which exact driver version are you using? Have you tried installing the latest NVidia driver from nvidia.com? There is a bug in some NVidia driver versions auto updated by Windows 10, which we are tracking in #50650. Reports indicate that it is fixed when downloading a newer driver. Keeping the GPU constantly busy would be bad for power consumption, not an acceptable solution I think.

Fable Fox commented

2017-05-11 04:43:43 +02:00

Added subscriber: @fablefox

Fable Fox commented

2017-05-11 04:43:43 +02:00

Changed status from 'Open' to: 'Archived'

Fable Fox closed this issue

2017-05-11 04:43:43 +02:00

Fable Fox self-assigned this 2017-05-11 04:43:43 +02:00

Fable Fox commented

2017-05-11 04:43:43 +02:00

could be driver issue? no reply on this end (exact version).

No news in over a week... closing

1) could be driver issue? no reply on this end (exact version). No news in over a week... closing

Sign in to join this conversation.

No Label

Download

What's New

Blender Studio

Manual

Developers Blog

Documentation

Benchmark

Blender Conference

Development Fund

One-time Donations

Viewport in blender lags due to the GPU under-utilization #51349