# \#slowdown

**URL:** https://discourse.itk.org/tag/slowdown/140.md

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## [CurvatureFlowImageFilter slowdown on Mac](https://discourse.itk.org/t/curvatureflowimagefilter-slowdown-on-mac/2530)

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**Author:** [@nm97](https://discourse.itk.org/u/nm97)\
**Replies:** 0\
**Last updated:** [December 16, 2019, 2:01pm UTC](https://discourse.itk.org/t/curvatureflowimagefilter-slowdown-on-mac/2530 "2019-12-16T14:01:05Z")

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Hi. I’m using CurvatureFlowImageFilter.cxx example. My Linux machine works 50% faster than Mac. Both have 16 cores and DefaultNumberOfThreads() returns 16 Linux: - 16gb RAM, i7, 2016, SSD. Mac - 16gb RAM, i7, 2017, …