title: netsession_mac using a lot of CPU. What is it?
body: <p>Quite often my computer gets hot and the CPU fan whirs loudly, when I'm not really doing anything demanding.</p>
  
  <p>I can see a process <code>netsession_mac_2fa687c</code> which is using 78% of CPU.</p>
  
  <p>What is that process and is it safe to kill it?</p>