title: Is setInterval CPU intensive?
body: <p>I read somewhere that setInterval is CPU intensive. I created a script that uses setInterval and monitored the CPU usage but didn't notice a change. I want to know if there is something I missed.</p>
  
  <p>What the code does is check for changes to the hash in the URL (content after #) every 100 milliseconds and if it has changed, load a page using AJAX. If it has not changed, nothing happens. Would there be any CPU issues with that.</p>