# 3D segmentation eraser tool - excessive compute?

**URL:** <https://discourse.slicer.org/t/3d-segmentation-eraser-tool-excessive-compute/37203>\
**Category:** Support\
**Tags:** segmentation\
**Created:** [July 4, 2024, 10:07pm UTC](https://discourse.slicer.org/t/3d-segmentation-eraser-tool-excessive-compute/37203 "2024-07-04T22:07:58Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![hari\_seldon](https://avatars.discourse-cdn.com/v4/letter/h/c6cbf5/32.png) [@hari\_seldon](https://discourse.slicer.org/u/hari_seldon)\
**Post date:** [July 4, 2024, 10:07pm UTC](https://discourse.slicer.org/t/3d-segmentation-eraser-tool-excessive-compute/37203/1 "2024-07-04T22:07:58Z")

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Hello, I am annotating a 256x256x256 cube of voxels in 3D, through removing excess semantic mask to generate instance segmentations, and the eraser tool is crippling laggy on an amd7950X, rtx4080S, 128Gddr5, 7500mb/s nvme build. I think the software is re-drawing every voxel with every movement or something? I’m not sure what is going on, but is there a way to streamline the 3D eraser tool? There’s zero lag in Napari out of the box, which surprised me, so maybe I’m missing an optimization or setting somewhere in Slicer? Thanks so much!!

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**Author:** ![pieper](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/pieper/32/8_2.png) [@pieper](https://discourse.slicer.org/u/pieper)\
**Post date:** [July 4, 2024, 10:12pm UTC](https://discourse.slicer.org/t/3d-segmentation-eraser-tool-excessive-compute/37203/2 "2024-07-04T22:12:29Z")

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Did you try turning off 3D rendering while you edit?

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**Author:** ![hari\_seldon](https://avatars.discourse-cdn.com/v4/letter/h/c6cbf5/32.png) [@hari\_seldon](https://discourse.slicer.org/u/hari_seldon)\
**Post date:** [July 4, 2024, 10:46pm UTC](https://discourse.slicer.org/t/3d-segmentation-eraser-tool-excessive-compute/37203/3 "2024-07-04T22:46:25Z")

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Well I’m editing the data in the 3D window with the eraser tool settings set to sphere brush and edit in 3D views. Does your comment still apply? If so, where is that setting? Thanks

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**Author:** ![hari\_seldon](https://avatars.discourse-cdn.com/v4/letter/h/c6cbf5/32.png) [@hari\_seldon](https://discourse.slicer.org/u/hari_seldon)\
**Post date:** [July 4, 2024, 10:50pm UTC](https://discourse.slicer.org/t/3d-segmentation-eraser-tool-excessive-compute/37203/4 "2024-07-04T22:50:36Z")

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I’m in the segment editor section of Slicer when i’m annotating.