# Download takes a long time to start, but download speed is then very fast

**URL:** <https://help.nextcloud.com/t/download-takes-a-long-time-to-start-but-download-speed-is-then-very-fast/62501>\
**Category:** ℹ️ Support\
**Tags:** nc16\
**Created:** [October 22, 2019, 12:09pm UTC](https://help.nextcloud.com/t/download-takes-a-long-time-to-start-but-download-speed-is-then-very-fast/62501 "2019-10-22T12:09:26Z")\
**Posts on this page:** 1\
**Showing post:** 15

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**Author:** ![gas85](https://help.nextcloud.com/user_avatar/help.nextcloud.com/gas85/32/7772_2.png) [@gas85](https://help.nextcloud.com/u/gas85)\
**Post date:** [October 29, 2019, 10:39am UTC](https://help.nextcloud.com/t/download-takes-a-long-time-to-start-but-download-speed-is-then-very-fast/62501/15 "2019-10-29T10:39:47Z")

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> [@nxcl](#):
>
> found that when I did thumbnail previews for all files my SQL DB grew with several GB

Check your preview directory size and be happy 😉  
I wrote about preview a bit here: [Previews / data size - #2 by gas85](https://help.nextcloud.com/t/previews-data-size/46990/2) also there is a linked information how to decrease preview folder (and may be DB) size.

Did you moved you data directory even once after installation? I have had this issue when DB was twice bigger than it should: [Files amount after moving of data directory is wrong (much bigger)](https://help.nextcloud.com/t/files-amount-after-moving-of-data-directory-is-wrong-much-bigger/57510)

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