Yes, I can confirm the same problem with the ruby.exe being almost always on 25% CPU
It's a Ruby software development kit. It uses a lot of memory which is normal. If it bothers too much, I would suggest upgrading to Gold, we'll host your robot on our cloud hosted VPS!
Memory and CPU power are totally different things. If memory was the problem, I can live with it, but CPU power means electricity bills and this is no different from mining. And please do not constantly suggest to upgrade; it is obvious this is not the solution here.