JQuery Causes Seemingly Endless Loop and page load times of 1 minute + - "Warning: reference to undefined property D.cache[a][d]"
This is obviously not a problem in Drupal core. This mean the the issue is in one of three places:


The theme
Custom module (developed by you)
Contrib module from Drupal.org


I can think of two approaches to go about and fix this.

Debugging

Replace the minified JS file(s) with non minified versions and start debugging.

Experiment

Try disabling modules/theme at turn until the problem disappears and try to pin point the part in the module/theme that causes the problem and from there try to find a solution.

Personally I would go for the experiment route, as this is often the fastest way to gain initial results.