# Batch editing performance issues on NAS
**URL:** https://community.mp3tag.de/t/batch-editing-performance-issues-on-nas/56873
**Category:** Support
**Created:** [March 30, 2022, 5:26pm UTC](https://community.mp3tag.de/t/batch-editing-performance-issues-on-nas/56873 "2022-03-30T17:26:20Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@BoboPagh](https://community.mp3tag.de/u/BoboPagh)
#### Post date: [March 30, 2022, 5:26pm UTC](https://community.mp3tag.de/t/batch-editing-performance-issues-on-nas/56873/1 "2022-03-30T17:26:20Z")
Hi Guys,
Been a happy user of MP3Tag for a while now.
Have run into a very odd problem when doing batch editing of files:
I wanted to re-categorize all the music on my NAS drive - approx. 25,000 files across 7 major music genres.
I do a select, grab say 500 files, mark say 50 files and change the Genre to e.g. Classical.
First batch fine - takes about 15 seconds or so for 50 files. The next 2-5 batch same thing, and then - while still working on files in the same sub-dir - all tag writing suddenly then takes 20 times as long, in the order of 10 minutes for 50 files. This will continue until I close MP3Tag, and restart the app.
Why? All files are located in the same shared directory structure; no network issues; same number of tags being edited; oh, and I have tried to sort the selection by sub-dir, artist etc - makes no difference.
Is there anything that I am missing here?
Regards,
Bo P
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### Author:  [@ohrenkino](https://community.mp3tag.de/u/ohrenkino)
#### Post date: [March 30, 2022, 5:38pm UTC](https://community.mp3tag.de/t/batch-editing-performance-issues-on-nas/56873/2 "2022-03-30T17:38:46Z")
Slow access because ...
- network connections are the almost the slowest way to access a lot of files,
- other processes like indexers, players, anti-virus programs could block the files for some time,
- padding is not big enough so the files have to be rewritten,
- Windows Defender slows down the access, see e.g.
[Windows Defender - Speed of loading files in MP3Tag](https://community.mp3tag.de/t/windows-defender-speed-of-loading-files-in-mp3tag/47784)
- File sizes vary (e.g. is bigger for some files than for others) and together with insufficient padding lead to re-writing the big files - which takes longer.
These would be the knobs I would twiddle and tweak.
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### Author:  [@MP3Freak\_Peter](https://community.mp3tag.de/u/MP3Freak_Peter)
#### Post date: [March 30, 2022, 7:03pm UTC](https://community.mp3tag.de/t/batch-editing-performance-issues-on-nas/56873/3 "2022-03-30T19:03:50Z")
in addition:
Be aware of not using wifi, even it's seems to be "fast".
Performance issue on batch processing (backup, mp3tag, mediapurge, what ever) slow down extremely
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### Author:  [@system](https://community.mp3tag.de/u/system)
#### Post date: [February 9, 2026, 12:29pm UTC](https://community.mp3tag.de/t/batch-editing-performance-issues-on-nas/56873/4 "2026-02-09T12:29:43Z")