# OpenGL2 reslice performance issues on windows (moved)

**URL:** <https://discourse.slicer.org/t/opengl2-reslice-performance-issues-on-windows-moved/1914>\
**Category:** Uncategorized\
**Created:** [January 23, 2018, 4:44pm UTC](https://discourse.slicer.org/t/opengl2-reslice-performance-issues-on-windows-moved/1914 "2018-01-23T16:44:14Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [January 18, 2018, 3:41pm UTC](https://discourse.slicer.org/t/opengl2-reslice-performance-issues-on-windows-moved/1914/2 "2018-01-18T15:41:11Z")

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> [@Vtk python does not import on today's windows nightly](https://discourse.slicer.org/t/vtk-python-does-not-import-on-todays-windows-nightly/1868/6):
>
> the nightly crashes when started over remote desktop but the 4.8.1 release does not (probably the OpenGL2 issue)

Yes, this is a known issue - see details and workarounds [here](https://issues.slicer.org/view.php?id=4252).

> [@Vtk python does not import on today's windows nightly](https://discourse.slicer.org/t/vtk-python-does-not-import-on-todays-windows-nightly/1868/6):
>
> I see the same slowdown in Slice rendering that Andras reported

@pieper Can you try if disabling “Threaded optimization” (in Windows Control Panel → NVidia Control Panel) makes it better?

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