Normally, you should ask this on superantispyware's forum but wt*. I haven't used it for a long time, tried it for a short period and then moved on. I think the reason it finds so many things every time is because it scans for cookies(can't think of any other reason). I would recommend using Malwarebytes Free, in my opinion it's better. About the slowdown, try using ccleaner and malwarebytes.