# \#performance
**URL:** https://discourse.slicer.org/tag/performance/60.md
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## [Third party library works slower inside Slicer's Python shell - why? how to do performance profiling?](https://discourse.slicer.org/t/third-party-library-works-slower-inside-slicers-python-shell-why-how-to-do-performance-profiling/18742)
**Author:** [@keri](https://discourse.slicer.org/u/keri)\
**Replies:** 2\
**Last updated:** [July 15, 2021, 10:24am UTC](https://discourse.slicer.org/t/third-party-library-works-slower-inside-slicers-python-shell-why-how-to-do-performance-profiling/18742 "2021-07-15T10:24:24Z")
Hi, I’m trying to use python package lasio. It is geological library and its main purpose is to read textual files of format .las After installing it (pip install lasio) I can use it as follows: import lasio las = las…
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## [Slow paint speed with large (10GB) volume](https://discourse.slicer.org/t/slow-paint-speed-with-large-10gb-volume/18195)
**Author:** [@hherhold](https://discourse.slicer.org/u/hherhold)\
**Replies:** 1\
**Last updated:** [June 18, 2021, 8:00pm UTC](https://discourse.slicer.org/t/slow-paint-speed-with-large-10gb-volume/18195 "2021-06-18T20:00:03Z")
I have a colleague with a fairly large micro-CT scan (10GB), and he is experiencing sluggish response times when painting with a sphere brush in the 2D slices (Show 3D not enabled). His machine is windows with 128GB RAM.…
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## [Parallel compression pigz](https://discourse.slicer.org/t/parallel-compression-pigz/6733)
**Author:** [@muratmaga](https://discourse.slicer.org/u/muratmaga)\
**Replies:** 2\
**Last updated:** [May 9, 2019, 5:08am UTC](https://discourse.slicer.org/t/parallel-compression-pigz/6733 "2019-05-09T05:08:22Z")
There was a discussion sometime ago about perhaps enabling pigz (parallel gzip) with Slicer. How to unset default 'compress' option during save - #7 by pieper At the time, question was lack of a windows port. I see ther…
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## [Volume Reslicing slow insome cases](https://discourse.slicer.org/t/volume-reslicing-slow-insome-cases/5436)
**Author:** [@mcfly3001](https://discourse.slicer.org/u/mcfly3001)\
**Replies:** 1\
**Last updated:** [January 27, 2019, 1:26pm UTC](https://discourse.slicer.org/t/volume-reslicing-slow-insome-cases/5436 "2019-01-27T13:26:01Z")
Hi everyone, I am using slicer to visualize a tracked tool in the MPR planes and found some performance issues where the framerate drops down to ~13 FPS. Using Slicer 4.10, I load the CT-Chest volume, add a coordinate s…
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## [Major slice scrolling performance degradation with volume rendering on](https://discourse.slicer.org/t/major-slice-scrolling-performance-degradation-with-volume-rendering-on/938)
**Author:** [@fedorov](https://discourse.slicer.org/u/fedorov)\
**Replies:** 6\
**Last updated:** [August 25, 2017, 1:46pm UTC](https://discourse.slicer.org/t/major-slice-scrolling-performance-degradation-with-volume-rendering-on/938 "2017-08-25T13:46:06Z")
There appears to be order of magnitude (from ~15 ms/frame to ~150 ms/frame) degradation in slice scrolling performance when volume rendering is enabled (slice is not shown in 3d view). See demo in this screencast: https…
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## [Improving performance to manage thousands of models](https://discourse.slicer.org/t/improving-performance-to-manage-thousands-of-models/813)
**Author:** [@jcfr](https://discourse.slicer.org/u/jcfr)\
**Replies:** 2\
**Last updated:** [August 3, 2017, 4:32pm UTC](https://discourse.slicer.org/t/improving-performance-to-manage-thousands-of-models/813 "2017-08-03T16:32:07Z")
This topic was created to capture discussion from https://github.com/Slicer/Slicer/pull/490#issuecomment-223869817 As suggested by @lassoan, if someone was time to invest, here are suggestions to address two specific bo…