Memory leak?

[AvangionQ]

So, I have 8600 torrents loaded. When Qbittorrent 4.6.1 starts, everything is good. Transfer speeds typically go above 100mbps.
After about twenty minutes or so, the RAM usage starts to rise rapidly until it hits the 8 GB cap set in the advanced settings.
After that, speeds drop to under 1mbps and stay below 2mbps until I manually restart Qbittorrent. I have no idea what's wrong.

[Peter]

Are you using NVME with heat spreader?

[AvangionQ]

Cooling system? No, I'm using two 20-inch external boxfans.

[Peter]

...

So basically the "leak" happens because your storage is simply not fast enough. HDDs suck at reading and writing random data. If it has to seek, it will die. Windows and the libtorrent will both eat into RAM when the HDD can't keep up so the program can do it's job. They are just hoping the drive will be able to finish the task and then write it all out. But no, because it keeps getting new work.

So in the end the work is just piling up.

You can...
- Use a RAID controller (preferably with DRAM cache + BBU) and use RAID10 for example to increase speed
- Buy big capacity NVME SSD cards or SSD drives just make sure they have a high TBW value so they can withstand this abuse

And that's about it.

There is not much you can do with these USB drives you have now to increase speeds. They are different capacity, different drives, etc. For RAID10 you'd need 4 drives of the same capacity at least. And you connect them using SATA to the controller. Also don't use motherboard raid controller, they are "fake raid", they absolutely suck.