title: Does server-side javascript function have performance issues in mongoDB?
body: <p>Does running server-side JavaScript have performance issues in MongoDB? Does V8 solve said performance issues?</p>
  
  <p>Why does the <a href="http://docs.mongodb.org/manual/tutorial/store-javascript-function-on-server/" rel="noreferrer">MongoDB documentation</a> recommended not using server-side functions?</p>