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I'm writing a RM app right now and believe these concerns to be overblown. They're overblown in the same way "Rails doesn't scale" is nonsense. The addition of WeakRef to RM helps significantly. And you just have to look out for gotchas.

If you want to be really convinced, check out RMQ: https://github.com/infinitered/rmq. Has made my life so easy.

There were some showstoppers with regards to memory leaks using procs/blocks. There's still a few major ones occasionally where you might be unable to use certain newer frameworks. You'll have to wait for them to fix it. But if you aren't on the bleeding edge, it's not so bad.

I believe there was an actual problem with Procs that they fixed a couple of months or so ago. The core developers seem to be active on Twitter, so you could ask the source directly if nobody here knows.