# scissors started to be very laggy

**URL:** <https://discourse.slicer.org/t/scissors-started-to-be-very-laggy/5996>\
**Category:** Support\
**Created:** [March 2, 2019, 10:55pm UTC](https://discourse.slicer.org/t/scissors-started-to-be-very-laggy/5996 "2019-03-02T22:55:03Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![froth](https://avatars.discourse-cdn.com/v4/letter/f/da6949/32.png) [@froth](https://discourse.slicer.org/u/froth)\
**Post date:** [March 2, 2019, 10:55pm UTC](https://discourse.slicer.org/t/scissors-started-to-be-very-laggy/5996/1 "2019-03-02T22:55:03Z")

</div>

Operating system: MacOS Mojave;  
Slicer version: 4.10.1

Actual behavior: after vessel segmentation i use scissors which begin to be very laggy. Few months before same taks went smoothly with similar CT data.  
All thing with the system seems to be fine. What can be the reason for it and how to fix it?