# Scissors in Segment Editor module seriously lagged in Slicer 5.10.0

**URL:** <https://discourse.slicer.org/t/scissors-in-segment-editor-module-seriously-lagged-in-slicer-5-10-0/46364>\
**Category:** Support\
**Tags:** segmentation\
**Created:** [March 3, 2026, 6:52am UTC](https://discourse.slicer.org/t/scissors-in-segment-editor-module-seriously-lagged-in-slicer-5-10-0/46364 "2026-03-03T06:52:43Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![VincentYu](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/vincentyu/32/69793_2.png) [@VincentYu](https://discourse.slicer.org/u/VincentYu)\
**Post date:** [March 3, 2026, 6:52am UTC](https://discourse.slicer.org/t/scissors-in-segment-editor-module-seriously-lagged-in-slicer-5-10-0/46364/1 "2026-03-03T06:52:43Z")

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Operating system: Windwos 11;  
Slicer version: 5.10.0

Recently I update Slicer from 5.8.1 to 5.10.0, and I found that sometimes the scissors in Segment Editor took very long computing time. After several small experiments, I found if the trajectory of the scissors is “outside“ the segment region and draw the trajectory slowly, this delay will happen. But this problem won’t happen in Slier 5.8.1 in the same condition (same segmentation nrrd, same “outside“ and “slow” trajectory).

Sometimes I want to cut segments carefully so I slow my drawing speed, and the computation may take several minutes to finish just one cutting.

Anyone can reproduce this problem?

 ![圖片](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/f/0/f04a46aedfa4338ef5eb057145602bca267dd2ea.jpeg)

The segmentation .nrrd is in the link below:

> **[SEG (MRI nerve).seg.nrrd](https://drive.google.com/file/d/1HE4sBEIIe-277wOZpnW8lgdO3uvbDcG9/view?usp=sharing)**
>
> Google Drive file.

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**Author:** ![cpinter](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/cpinter/32/7995_2.png) [@cpinter](https://discourse.slicer.org/u/cpinter)\
**Post date:** [March 3, 2026, 11:31am UTC](https://discourse.slicer.org/t/scissors-in-segment-editor-module-seriously-lagged-in-slicer-5-10-0/46364/2 "2026-03-03T11:31:23Z")

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Thanks for the detailed report!

I loaded the segmentation you shared in 5.8.1 and 5.10, and I was able to reproduce the issue. In 5.10 using the scissors was much slower.

Can you please create an issue on GitHub? The same description and file share will do just great. Thanks a lot!

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<div class="post-metadata">

**Author:** ![VincentYu](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/vincentyu/32/69793_2.png) [@VincentYu](https://discourse.slicer.org/u/VincentYu)\
**Post date:** [March 3, 2026, 1:02pm UTC](https://discourse.slicer.org/t/scissors-in-segment-editor-module-seriously-lagged-in-slicer-5-10-0/46364/3 "2026-03-03T13:02:09Z")

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Thank you for your quick reply!

I’ve created an issue on Slicer’s GitHub.

> <https://github.com/Slicer/Slicer/issues/9055>
>
> Operating system: Windwos 11;
> Slicer version: 5.10.0
> 
> Recently I update Slicer f…rom 5.8.1 to 5.10.0, and I found that sometimes the scissors in Segment Editor took very long computing time. After several small experiments, I found if the trajectory of the scissors is “outside“ the segment region and draw the trajectory slowly, this delay will happen. But this problem won’t happen in Slier 5.8.1 in the same condition (same segmentation nrrd, same “outside“ and “slow” trajectory).
> 
> Sometimes I want to cut segments carefully so I slow my drawing speed, and the computation may take several minutes to finish just one cutting.
> 
> The segmentation .nrrd is in the link below:
> https://drive.google.com/file/d/1HE4sBEIIe-277wOZpnW8lgdO3uvbDcG9/view?usp=sharing
> 
> This issue was also \[posted on 3D Slicer Forum\](https://discourse.slicer.org/t/scissors-in-segment-editor-module-seriously-lagged-in-slicer-5-10-0/46364/1).
> 
> Thank you!