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!
Here's a better idea, you don't
need to upgrade to premium software design platinum tier, it's free: fix the bot so it doesn't use 100% CPU when it trades once a week... it's not logical to "calculate" billions of operations per second when the actual decision is required once every few hours.