# Apply 1D FFT along specified dimension (row or column) using SimpleITK is SLOW

**URL:** <https://discourse.itk.org/t/apply-1d-fft-along-specified-dimension-row-or-column-using-simpleitk-is-slow/7247>\
**Category:** Uncategorized\
**Created:** [October 8, 2024, 6:02pm UTC](https://discourse.itk.org/t/apply-1d-fft-along-specified-dimension-row-or-column-using-simpleitk-is-slow/7247 "2024-10-08T18:02:21Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![zivy](https://discourse.itk.org/user_avatar/discourse.itk.org/zivy/32/1726_2.png) [@zivy](https://discourse.itk.org/u/zivy)\
**Post date:** [October 8, 2024, 6:56pm UTC](https://discourse.itk.org/t/apply-1d-fft-along-specified-dimension-row-or-column-using-simpleitk-is-slow/7247/3 "2024-10-08T18:56:51Z")

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Hello @SuperTXUH,

Not specific to FFT, is your build in release mode or could it be that it is in debug mode? The issue with speed and build type has happened to [others in the past](https://discourse.itk.org/t/speed-discrepancy-between-itk-and-simpleitk/6070).

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_[View the full topic](https://discourse.itk.org/t/apply-1d-fft-along-specified-dimension-row-or-column-using-simpleitk-is-slow/7247)._