First, I am as much of an RM fanboy as you can get. I have used RM for a couple years now, and often recommend it to others. RM 3 has been great and keeps me highly efficient (I came from a .net world where I used R# a lot).

So I see RM 4 came out today. Normally with any software I rely on for my day to day work, I wait at least a couple weeks before upgrading. However, against better judgement I start the download and install it.

Now I'm screwed.

700% CPU spikes on project open. Then it hangs, completely unresponsive, chewing up 100% CPU. I went to lunch and upon my return I see it's no longer using 100% CPU but it's still hung.

My scenario, Ubuntu 11.10, i7, 8gb ram.

YMMV, but I'd wait if I were you.

P.S. Anyone from jetbrains, feel free to contact me. I love the product and am confident this is a release day issue that you will get resolved quickly.

Update

I found that opening a smaller project would work, but that the initial (largish) project would not load. After allocating 4gb of ram to RM, it finally opened.

edit this file to do the same: RM_path/bin/rubymine64.vmoptions

I went with these for settings:

-Xms512m -Xmx4096m -XX:MaxPermSize=700m -XX:ReservedCodeCacheSize=128m -ea