Ok thanks. No I don't run them simultaniously, I ran Frostwire only to test, I like Phex more.

Here are my pc specs:
Pentium III 500 mhz with 512MB-RAM

It shouldn't be a problem running Phex at all, but there is really something strange going on. When I do nothing everything works fine. But the moment I start a search the performance is already somewhat low: the GUI reacts slow and Phex slows down my system a bit. But the moment I start a single download with only few connections it gets much worse, the CPU starts ratteling whole the time and the whole system slows down to a crawl.

I doubt if I can go back to a previous java version because I can't find the older version on Suns website so I don't know how to get it, do you?

But first I'll try the previous version of Phex and let you know if the problem persists...