# Improve Markup Rendering Speed (convert to spherical surface?)

**URL:** <https://discourse.slicer.org/t/improve-markup-rendering-speed-convert-to-spherical-surface/24029>\
**Category:** Support\
**Created:** [June 24, 2022, 4:17pm UTC](https://discourse.slicer.org/t/improve-markup-rendering-speed-convert-to-spherical-surface/24029 "2022-06-24T16:17:01Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![skeltoh](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/skeltoh/32/15782_2.png) [@skeltoh](https://discourse.slicer.org/u/skeltoh)\
**Post date:** [June 24, 2022, 4:17pm UTC](https://discourse.slicer.org/t/improve-markup-rendering-speed-convert-to-spherical-surface/24029/1 "2022-06-24T16:17:01Z")

</div>

I have a bunch of RAS space coordinates (~1000) that I want to render on top of an MRI, atlas, and surfaces from 3D segmentation. I can make them into an .fcsv and import them into Markups, and they show up appropriately, but it’s extremely slow to do anything (sometimes it will hang for minutes if I pan the image).

How could I do this in a way that’s less computationally intensive? I’m thinking if I just had the marker spheres as voxel data, it would render fine, is there a built in way to “export” the markup glyphs as voxels or surfaces?

---

<div class="post-metadata">

**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:** [June 24, 2022, 4:43pm UTC](https://discourse.slicer.org/t/improve-markup-rendering-speed-convert-to-spherical-surface/24029/2 "2022-06-24T16:43:14Z")

</div>

Do you use the latest Slicer Stable Release? Rendering of markups with many points may be slower in earlier versions.

You can further speed up rendering by:

- hiding point labels: Markups module → Display → Advanced → Control Point Labels → uncheck)
- locking the control points (disable interaction): Markups module → Control Points → Interaction → click the first icon so it appears as a closed lock