[xavier242]

qBittorrent has some major bugs making it unsuitable for downloading more than a few torrents (unstable speeds) and it "stalls" when there are only a few seeders. It has huge memory leaks in some use cases leading to crashes and rechecking your torrents. It can also have torrents randomly disappear.

The ultimate downloader for Windows IMO is uTorrent 2.2.1 with a MLC SSD for the temp folder, and automatically saving to your main drive when done. Max is about 3000 torrents, and up to 900 actively downloading.

MLC SSDs have about 10x higher I/Os per second than a consumer QLC or TLC SSD and lasts 10 to 20 times longer.

The 400GB Intel DC S3XXX series is rated for 5700TBW life but typically lasts up to 32000TBW (you may be gone before it fails). The ones available are server pulls and a barely used one goes for about $35 (new it was like $2000).

uTorrent 3.x has a major bug when more than about 500 torrents are loaded: for unknown reasons, it fails to notify the tracker about all loaded torrents, causing torrents to not be downloaded or seeded. This is not a queue issue as the queue was set high enough to start all torrents.

Issues with 2.2.1:
uTorrent does not like to share its temp folder drive with other apps (including the OS's pagefile). This causes freezing and crashes. Be sure to use a dedicated local drive for your uTorrent temp folder.

If you get an out of memory error on a torrent, immediately stop all torrents. Close the program and restart it. It's a 32bit app and can use all 2GB with a ton of activity over a few days. Under normal use, this rarely happens.

Do not use a network drive without a low global rate (like 1MBytes/sec). If you still get GUI freezing, forget the network drive and set up a local drive. External drives are fine. USB 3.0 or 3.1 typically works great.

If you download to a local drive but auto-move to a network drive, note that the download continues, buffering the data in RAM while the save takes place. If your global rate is high and you're saving torrent is large, you can run out of buffer space and go into disk overload, which can sometimes crash uTorrent (and maybe the OS).

All minor issues and can be worked around. The qBittorrent issues are many years old and the developers have closed most related bug tickets. My guess is they can't reproduce the issues and/or don't know how to fix them, and are hoping a new developer might one day solve the issues.

If qBittorrent works great for you, you've won the bittorrent client lottery.

There are lots of other clients. Some are ok and some are not especially useful. I have yet to find one that is perfect in every test.