title: Ruby on Rails: How would I handle 10 concurrent users? Do I need more CPU?
body: <p>Sorry if this might seem obvious. I've monitored that a web request on my Rails app uses 30-33% of CPU every time. For example, if I load a web page, then 30% of CPU is used. Does that mean that my box can only handle 3 concurrent web requests, and will stall if there are more than 3 web requests (i.e. I'll get a 100% CPU)?</p>
  
  <p>If so, does that also mean that if I want to handle more than 3 concurrent web requests, then I'll have to get more servers to handle the load using a load balancer? (e.g. to handle 6 concurrent web requests, I'll need 2 servers; for 9 concurrent requests, I'll need 3 servers; for 12, I'll need 4 servers -- and so on?)</p>