title: Is it bad to have a javascript timer constantly running (for session checking)?
body: <p>I am contemplating creating a 1 minute session logout warning message.</p>
  
  <p>To do this, I assume I will need a javascript timer constantly running in the background.  </p>
  
  <p>Is this a terrible use of resources to run a timer constantly like this or is it small enough not to matter?</p>