# Scanning slow on MacOS **URL:** https://forum.syncthing.net/t/scanning-slow-on-macos/18075 **Category:** Support **Created:** [February 21, 2022, 12:54pm UTC](https://forum.syncthing.net/t/scanning-slow-on-macos/18075 "2022-02-21T12:54:16Z") **Posts on this page:** 1 **Showing post:** 17
### Author: ![pporozin](https://forum.syncthing.net/letter_avatar_proxy/v4/letter/p/c77e96/32.png) [@pporozin](https://forum.syncthing.net/u/pporozin) #### Post date: [February 21, 2022, 10:53pm UTC](https://forum.syncthing.net/t/scanning-slow-on-macos/18075/17 "2022-02-21T22:53:26Z")
There is actually another command which can show the process itself and what happens with the read/write etc. `sudo fs_usage syncthing` which in my case has an output like: ``` 16:32:36.098645 write F=32 B=0x1000 0.000008 syncthing.1030685 16:32:36.098658 write F=32 B=0xc97 0.000007 syncthing.1030685 16:32:36.098667 read F=32 [35] 0.000001 syncthing.1030685 16:32:36.138932 THROTTLED 0.715509 syncthing.1030732 16:32:36.138933 read F=25 B=0x8000 0.872152 syncthing.1030732 16:32:36.224242 THROTTLED 0.794747 syncthing.1030714 ``` Any THROTTLED as far as I know means that the MacOS is throttling resource heavy processes for idle applications. Why the Syncthing is considered as an idle application I have no clue, **the developers can probably answer and fix this**. How to temporary fix it? Prior folder scan you can run: ``` sudo sysctl debug.lowpri_throttle_enabled=0 ``` To enable the throttling again you run: ``` sudo sysctl debug.lowpri_throttle_enabled=1 ``` You can as well run `sudo sh -c 'echo debug.lowpri_throttle-enabled=0 >> /etc/sysctl.conf'` to disable the throttling on your system completely (no clue what will be the long term impact). With disabled throttling the scanning performance is in my case ~270MiB/s (the value 8 for `Hashers` seems to be good for my storage). Thank you very much everyone for your help! --- _[View the full topic](https://forum.syncthing.net/t/scanning-slow-on-macos/18075)._