What a 15 second wait indicates

From https://groups.google.com/d/msg/mathjax-users/fgqSbu9DWYM/oqWLt7CpQSUJ

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A timeout before anything happens is almost always a sign that MathJax couldn't load the configuration file successfully. This is frequently (and I think in your case) due to the following misconfiguration (cf the documentation on local configuration with the CDN):

A configuration file must always end with something like

MathJax.Ajax.loadComplete("local/local.js");

The link structure in that line must match the link structure with which the configuration file is called.

In your case, you called MathJax with

http://www.iolympiads.com/MathJax/MathJax.js?config=local/local.js

So I think the line should be

MathJax.Ajax.loadComplete("[MathJax]/config/local/local.js");

I can't check more right now, but if this doesn't work, play around with the link structure a little (try changing the folder structure or switch to absolute links)

Let me know if this helps.
Peter.

PS: For me it uses locally installed fonts just fine right now so I can't reproduce those issues.