Rate limit disk I/O while (re-)checking

[supercilious]

Please implement the option to reduce the disk I/O speed for check/rechecking torrents. At the moment qBittorrent completely swamps my system with I/O requests to the extent that the entire system feels sluggish due to the increased disk latency. It would be great if I could limit the checking speed to reduce or eliminate this effect. I don't mind that the checking will take longer as long as the rest of the system doesn't slow to a crawl while that is happening.

qBittorrent version and Operating System

qBittorrent v4.1.9.1 (x64) on Windows 10

What is the problem

Extreme disk I/O that causes even a fast SATA SSD to lag during torrent checking.

What is the expected behavior

Ideally, I could limit the checking speed to 100MB/s or so to prevent lag spikes for activity from other programs.

Steps to reproduce

Re-check any large torrent while there is other I/O activity taking place on the system.

[benvaljean]

In Windows you can reduce the priority, this reduce the IO priority too.

https://superuser.com/questions/496638/limiting-the-hard-drive-read-speed-for-a-program-c/496639

[supercilious]

In Windows you can reduce the priority, this reduce the IO priority too.

I just tried this via Task Manager setting the qbittorrent.exe priority to the lowest possible setting. It does not help at all with the latency. The entire system still gets noticeably laggy :(

[Balls0fSteel]

Sadly Windows doesn't really provide any other kind of throttling besides Task Scheduler. For me, setting priority really helped back when IO was super limited.