I downloaded Sencha Touch commercial earlier this week but when trying to view the docs offline via:

file:///.. .../Downloads/st2/docs/index.html

I experienced a 24 second delay before the docs page rendered.

Looking at a network trace a request to google api was timing out after 22 seconds. All fixed now after removing the following from ...\Downloads\st2\docs\index.html:

<script type="text/javascript">
document.write("<link href='"+document.location.protocol+"//fonts.googleapis.com/css?family=Exo' rel='stylesheet' type='text/css' />");