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If you haven't, tune the garbage collector for rails. By tuning, I was able to improve the performance of my production application by about 60%.

Can you elaborate a bit on this? Did you simply patch the GC? I've seen Evan Weaver's post (http://blog.evanweaver.com/articles/2009/04/09/ruby-gc-tunin...) on it, but that's it.

GC tuning is easy with REE, you can set environment variables to change the behavior of the mark and sweep collector. See slides 50-53 for more info.

Thanks for the info! I'll check out REE again.