title: Vue: :key="$route.fullPath" performance issue
body: <p>I was debugging an issue that has been in an application for a long time. After a while I figured out that <code>:key="$route.fullPath"</code> on <code>&lt;router-vie&gt;</code> was causing the issue because an anchor tag was added to the path. Long story short, after removing <code>:key="$route.fullPath"</code> I noticed a huge performance boost in the application. Pages render much faster, HTTP requests to the backend run faster, ... Altogether a nice surprise.</p>
  
  <p>What causes this performance boost? I find little to no information about this.</p>