title: Any downsides to excessively using JSNI calls in GWT?
body: <p>Might seem like a naive question, but is there any obvious downside (performance wise) to using alot JSNI instead of just sticking to pure GWT? </p>
  
  <p>I ask because as i work with GWT, i find myself having to deal with very specific requirements that are best approached by using mature Javascript libraries...</p>