# Slow loading dicom CT slices (~300)

**URL:** <https://discourse.slicer.org/t/slow-loading-dicom-ct-slices-300/36209>\
**Category:** Support\
**Tags:** data-loading\
**Created:** [May 16, 2024, 5:14pm UTC](https://discourse.slicer.org/t/slow-loading-dicom-ct-slices-300/36209 "2024-05-16T17:14:53Z")\
**Posts on this page:** 1\
**Showing post:** 6

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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:** [May 17, 2024, 7:18pm UTC](https://discourse.slicer.org/t/slow-loading-dicom-ct-slices-300/36209/6 "2024-05-17T19:18:27Z")

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Yes, that would explain it. There have been issues reported recently about OneDrive and Dropbox causing problems.

> [@Windows: Unable to import DICOM files that are in a OneDrive-backed up folder](https://discourse.slicer.org/t/windows-unable-to-import-dicom-files-that-are-in-a-onedrive-backed-up-folder/36153):
>
> TL;DR: on Windows, do not use folders that are backed up by Microsoft OneDrive for DICOM images that you want to import into Slicer DICOMBrowser! @vkt1414 and I have been debugging an issue that we thought is a problem with our extension, but upon further investigation it turned out the issue was not in the extension. Logs showed that DCMTK failed to open the DICOM files our extension was downloading. Initially, I thought this is due to the presence of dots in the folder hierarchy, but @pieper …

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