title: Extjs form performance problem
body: <p>We use big input forms with couple of input fields and run into performance problems. The exact problem is the render time of the form. It takes couple of seconds (4-10sec) to display the form.
  We use multi column layout and ~30 combo fields loaded by json datastore and another ~10 input fields.
  The render process is so slow so I can see the alignment and display process of the form. Is there any method to speed up the display process?</p>