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Very Laggy UI Using Second Monitor Through Boot Camp
Closed, ResolvedPublic


System Information

  • Computer: Late 2013 27-inch iMac
  • OS: Windows 10 Home through Bootcamp (upgraded from Windows 7 Home Premium)
  • Processor: 3.5GHz quad-core Intel Core i7 (Turbo Boost up to 3.9GHz)
  • Display: 27-inch 2560 x 1440, external display running at 1920 x 1080
  • Memory: 16GB (two 8GB) of 1600MHz DDR3
  • Graphics: NVIDIA GeForce GTX 780M with 4GB of GDDR5 - Driver Version: 364.72

Blender Version

  • Broken: 2.77 abf6f08 (affects other versions though - see below)
  • Worked: N/A

Short description of error
When using Blender through Boot Camp Windows 10 with an external monitor (Mini Display Port-to-HDMI Adapter), Blender exhibits serious UI lag. The only workaround I've been able to find is to unplug the external monitor from the computer. No other OpenGL applications seem to be affected, and there are no problems running Blender under OS X (10.11.4 to be exact). Here is a link describing a similar issue dating back to May 2015, which would be Blender version 2.74, or possibly lower.

Exact steps for others to reproduce the error
Run Windows through Boot Camp with an external monitor attached. Bug is independent of any specific .blend file (it occurs by simply launching Blender).



Related Objects

Event Timeline

Novian (ModernGlitch) raised the priority of this task from to Needs Triage by Developer.
Novian (ModernGlitch) updated the task description. (Show Details)
Novian (ModernGlitch) set Type to Bug.
Bastien Montagne (mont29) lowered the priority of this task from Needs Triage by Developer to Needs Information from User.Apr 29 2016, 12:01 PM

This (remotely) sounds similar to T48144 too… Did it work OK when you were using win7? Also:

  • Ensure both your OS and drivers are fully up-to-date.
  • Try the latest build from our buildbot.
  • Try to start Blender in factory settings (--factory-startup commandline option) (this will ensure whether this is a userpref or addon issue or not).
  • Try to tweak OGL settings in UserPreferences, System tab (window.draw methods, multisampling...).
  • Try to tweak your GPU driver settings (e.g. try different values between 'performance' and 'quality' if you have such slider, etc.).
  • Attach as text file here the report generated by Help -> System Info (do not paste it directly in comment).
  • Try to place this dll next to your blender.exe (software OGL, will be slow, but will show whether this is a driver issue or not).
Novian (ModernGlitch) closed this task as Resolved.Apr 29 2016, 10:45 PM
Novian (ModernGlitch) claimed this task.

Ah! So it appears that Blender runs just fine if you move NVIDIA Control Panel's Performance vs Quality Slider all the way over to favor Performace. But favoring Quality or a balance of the two results in heavy UI lag, even if you customize the settings under Manage 3D Settings > Program Settings.

Funny how moving the slider was the one thing I hadn't tried before, thinking that leaving it up to the application to decide it's own settings was best. Although I still don't completely understand why this is only a problem when using a second monitor.

Anyway, thank you for your suggestions. I did try the first four suggestions provided, and they had little to no effect, but the fifth one was the charm. :) If you still would like me to attach the text file and try the .dll please let me know, and I'll get right to it! Also, I didn't receive my second monitor before upgrading to Windows 10, so I cannot say if this was an issue in Windows 7.

Thanks again!