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    <p>Two things. First, Ruby is a relatively young language, and you may run into brick walls when trying to do slightly more esoteric things (like connect to non mainstream or older types of datasources). It also has poor GC, and no kernel threads, both of which are very important for a high performance platform. The main codebase (MRI) is quite hacky (lots of clever obfuscating programmer tricks like macros) and there are parts that are poorly written (gc and thread scheduling leap to mind). Again, it is a very young platform that got very popular very fast.</p> <p>Secondly, while ruby the language and rails the ideas/paradigm are both phenomenal, ruby and rails the platforms are not. There is a hell of alot in both ruby and rails that is downright ugly, and deployment solutions are in the dark ages compared to what is considered normal for other platforms (php/asp/jsp).</p> <p>Being accused of trolling here, so I will expound a bit. Due to the threading model, Rails cannot process requests concurrently unless you launch multiple full instances of your rails app. To do that you have two options, the relatively young and still under development passenger (mod_rails), or the tried and tested apache load balancer with multiple mongrel instances behind it.</p> <p>Either way, the lack of the ability to just just spawn workers means you will want 5-10 full instances of your application running, which incurs a very large overhead (can easily be 300-500megs per app depending on your gems and how big your app is). Because of that, the infrastructure needed to serve rails is a hell of alot more complecated then most other things.</p> <p>Now, that being said, the situation has been continuously getting better (I mean, passenger is usable now, it wasn't the last time I had to deal with deploying a rails app). I would be very surprised if rails doesn't catch up in the next few years.</p> <p>Also, rubinius/jruby are doing things the right way, and are moving along at a great pace. I wouldn't be suprised if MRI gets dropped in the next few years in favor of one of those implementations for mainstream rails work.</p>
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    1. POWhat can you NOT do in Rails that you can do in another framework?
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    1. USMatt Briggs
    1. USMatt Briggs
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    1. POWhat can you NOT do in Rails that you can do in another framework?
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    1. COUm, deployment solutions in the dark ages? lolwut? There's capistrano for deploying to a server and passenger for running the app. Really you don't even need to use capistrano, just upload and go.
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      1. USRyan Bigg
    2. COexpounded a bit, I actually wasn't trolling and do have reasons for the things that I said ;-)
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    3. CO[YARV](http://en.wikipedia.org/wiki/YARV) is the new Ruby VM as of 1.9 and it makes some speed improvements. It even starts working on making threading better!
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      1. USCJ Bryan
 

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