# Buffering issue while optically tracking a stylus

**URL:** <https://discourse.slicer.org/t/buffering-issue-while-optically-tracking-a-stylus/28401>\
**Category:** Support\
**Created:** [March 15, 2023, 10:07pm UTC](https://discourse.slicer.org/t/buffering-issue-while-optically-tracking-a-stylus/28401 "2023-03-15T22:07:42Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![askaderd](https://avatars.discourse-cdn.com/v4/letter/a/a9adbd/32.png) [@askaderd](https://discourse.slicer.org/u/askaderd)\
**Post date:** [March 15, 2023, 10:07pm UTC](https://discourse.slicer.org/t/buffering-issue-while-optically-tracking-a-stylus/28401/1 "2023-03-15T22:07:43Z")

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Hi there,

I’m currently trying to optically track a stylus as it moves through space using an NDI Vega optical tracker. At times this works perfectly fine, but a lot of times I end up running into buffering issues with Slicer, where I try to move the stylus around but it takes a while for Slicer to update. I’ve tried updating Slicer, repositioning the Vega system, restarting my computer, ect. but still seem to have the same issue. Any help would be really appreciated!

[https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/6/4/641e65523215de4cbef2f03d301a968876092712.mp4](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/6/4/641e65523215de4cbef2f03d301a968876092712.mp4)

[https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/f/7/f77466f3cb0dc18b3a23d8770d59dee901cb09f2.mp4](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/f/7/f77466f3cb0dc18b3a23d8770d59dee901cb09f2.mp4)

-Ammarah