# Segmentation in Slicer extremely slow when using the Scissors tool in slice view

**URL:** <https://discourse.slicer.org/t/segmentation-in-slicer-extremely-slow-when-using-the-scissors-tool-in-slice-view/41930>\
**Category:** Support\
**Tags:** segmentation\
**Created:** [March 2, 2025, 5:28pm UTC](https://discourse.slicer.org/t/segmentation-in-slicer-extremely-slow-when-using-the-scissors-tool-in-slice-view/41930 "2025-03-02T17:28:01Z")\
**Posts on this page:** 1\
**Showing post:** 14

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**Author:** ![Russell\_Engelman](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/russell_engelman/32/18425_2.png) [@Russell\_Engelman](https://discourse.slicer.org/u/Russell_Engelman)\
**Post date:** [March 15, 2025, 3:42am UTC](https://discourse.slicer.org/t/segmentation-in-slicer-extremely-slow-when-using-the-scissors-tool-in-slice-view/41930/14 "2025-03-15T03:42:39Z")

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> [@muratmaga](#):
>
> Is it possible to share your data?

Yes. The _Vormela_ scan is openly available online and can be found at the following link…

> **[Computed tomography voxel dataset for ummz:mammals:57841-Vormela peregusna...](https://deepblue.lib.umich.edu/data/concern/data_sets/4b29b6830)**
>
> Scan of specimen ummz:mammals:57841 (Vormela peregusna peregusna) - Skull. Raw Dataset includes 1601 TIF images (each 1036 x 1784 x 1 voxel at 0.03049953 mm resolution, derived from 1601 scan proje...

That said, the problem is not unique to this scan but I have had it with multiple CT datasets downloaded from MorphoSource. I had similar issues with [this scan](https://www.morphosource.org/concern/biological_specimens/000569301?locale=en) of _Mungotictis decimlineata_, for example. Indeed, this has been a problem with almost every dataset I have loaded into 3D Slicer except for very small ones.

> [@muratmaga](#):
>
> What are the specs of your computer beyond RAM (like the CPU/GPU on them)?

For the first computer it is…

**Computer** - Dell Precision 5820 Tower  
**Software OS** - Windows 10  
**Total RAM** - 32 gB  
**CPU** - Intel(R) Xeon(R) W-2225 CPU @ 4.10 gHz  
**GPU** - NVIDIA RTX A4500  
64 bit operating system, 4 cores

For the second (the one with Avizo 7 and the one where Slicer took 28 seconds to work per action) it is…

**Computer** - Dell Precision 7710  
**Software OS** - Windows 10 Pro  
**Total RAM** - 64 gB  
**CPU** - Intel(R) Xeon(R) CPU E3-1505M v5 @ 2.80 gHz  
**GPU** - NVIDIA Quadro M3000M

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