title: Rotating looking glass icon in status bar
body: <p>I've been wondering what the little symbol in the Visual Studio 2012 status bar that looks like this <img src="https://i.stack.imgur.com/2v8Kz.png" alt="enter image description here"> is indicating. It is located in the status bar next to the current line number. It is animated and the looking glass is rotating. </p>
  
  <p>So what does it indicate? And does the action it indicates, have an impact on the performance of Visual Studio?</p>