already shut down RSS DHT and channel.The other BT clients are less than tixati.

What is the biggest file in your Tixati profile catalog? channels2.dat? How much is it exactly?

If you have used torrent cache channels, you need to remove them from the local list to delete their data. If you see millions of shared files in the status column, your client still stores it. Fully stop the program to be sure. After next gather they re-appear, but remain empty if you don't connect.

Other possible reason is having a lot of torrents with tens of thousands of files.

Probably just a matter of using the RAM available, offload the hard disks. Or is your total free RAM below, say, 5GB?

RSS was turned off，nothing downloads and uploads，the rest space of disk is 50 Gib，still 750 Mib memory，2 times than Bigly BT 4.0.0 with JAVA 25 (64 bit) Eclipse Adoptium with also thousands RSS not auto download，qbittorrent 5.1.4 is much less than other BT clients.

You are sharing the thumbnails not the screenshots.

Linking full images would be great, but those are easy to figure out.

https://pixhost.to/show/5648/693621325_qq20260210101333.png
https://pixhost.to/show/5680/694044759_qq20260211182807.png
https://pixhost.to/show/5680/694044761_qq20260211182702.png

I guess that downloaded RSS data remains stored on disk and in memory until you remove the old RSS feeds themselves. Try doing that, restarting the program, and checking the size. If that doesn't work, stop, and delete rss2.dat and its backup copy manually, that will clean everything you previously did with RSS.

Now why there is so much data is another question. Maybe it's some error. Maybe you subscribed to full stream producing tens of thousands items per day. You filter them locally by some term, but they are still downloaded. In that case, it's better to subscribe to search or tag results RSS to make filtering happen on the server, and produce a small list of items to download.

the memory become small after deleting RSS2.dat, how can I keep the history RSS and maintain low memory usage？other BT clients with thousands of RSS history won't affect the memory usage.