title: % Time in RT checks
body: <p>While monitoring performance counters during the load test of a .NET web application, the default critical threshold of 10 was constantly exceeded for a counter called "% Time in RT checks".</p>
  
  <p>Why is it bad to spend a lot of time doing runtime checks?<br>
  What might this say about our application?
  How should this be improved?</p>