# Point list performance is very slow with large point list

**URL:** <https://discourse.slicer.org/t/point-list-performance-is-very-slow-with-large-point-list/23591>\
**Category:** Support\
**Tags:** markups\
**Created:** [May 25, 2022, 8:45pm UTC](https://discourse.slicer.org/t/point-list-performance-is-very-slow-with-large-point-list/23591 "2022-05-25T20:45:02Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![jamesobutler](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/jamesobutler/32/7511_2.png) [@jamesobutler](https://discourse.slicer.org/u/jamesobutler)\
**Post date:** [May 25, 2022, 8:53pm UTC](https://discourse.slicer.org/t/point-list-performance-is-very-slow-with-large-point-list/23591/3 "2022-05-25T20:53:09Z")

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Which version of Slicer are you using? There was a performance improvement committed recently which is available in latest Slicer preview. It is not present in current Slicer 5.0.2 stable.

> <https://github.com/Slicer/Slicer/issues/6379>
>
> Adding new markup control points is very slow if Markups module is active and co…ntrol points table is visible.
> 
> See user error report at https://discourse.slicer.org/t/adding-points-to-point-list-markup-becomes-progressively-slower/23419/4
> 
> \## Steps to reproduce
> 
> \- Create a \`Point list\` markup
> \- Add 100 control points
> \- Add one more control point - it takes a fraction of a second
> \- Go to Markups module, open Control points section
> \- Add one more control point - it takes several seconds
> 
> \## Expected behavior
> 
> Adding a control point should only take a fraction of a second.
> 
> \## Environment
> \- Slicer version: Slicer-5.1.0-2022-05-08
> \- Operating system: Windows10

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_[View the full topic](https://discourse.slicer.org/t/point-list-performance-is-very-slow-with-large-point-list/23591)._