Ruby on Rails

 I have heard alot about Node.js and watched a few tutorials and read some stuff. I get the impression that in certain situations AJAX calls with node.js is alot faster than with rails. I also have somewhat of an impression that with Rails web sockets are complicated to implement but with node.js web sockets might be alot easier.

  I am trying to figure out if I should learn some node.js or if it could be a passing fad to be replaced with some other technology soon. I am also wondering what sorts of improvements to rails might be coming in the future that could make AJAX calls faster in some situations as well as easier web socket implementations ? Are there things out there already ? Does it make sense to run a sinatra app along with rails for faster AJAX ?

 How can a websocket implementation work easily with rails when it is different than the typical request cycle of HTTP ?

 Otherwise I guess alot of AJAX stuff is just based on polling if the server wants to refresh page content without any user triggered events ?

 I did an experimental web socket implementation using ruby faye a couple of years ago that needed event machine. I did think it was a bit complicated.

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