Originally Posted by gergo

I am using a share seedbox, but it looks for me, which tells me the CPU load of the seedbox, and it looks like for me, that if I lower the number of max opened files, then the CPU load decreases and sometimes the uploading speed increases. My goal will be to keep tons of torrent in seed, but actually only make upload trafic on a high (more, than 300KB/s) upload speed ones. That way there won't be too much upload slots, which slows down the process. Also, it would be a really good thing, if I could somehow report to the trackers, that I am still seeding the torrents, but not do any traffic for a time, while am I seeding the newly downloaded torrent. That will significantly increase the efficiency of the seedbox. But if I simply just stop them, then they will just produce HNRs and won't generate bonus points.

That's very easy to do if your seedbox provider has the Ratio Groups plugin installed. If not maybe you can ask them to install it for you.
In a nutshell you can create ratio rules for example when torrent A reaches 2:1 ratio then limit upload speed to 16kb/s
When torrent B reaches 10GB of upload delete torrent and data

There are many things you can do actually, just google it