freezes in all pages :/

[mullets]

first, thanks for create this script, its very percect! But I'm have a problem here.

if I use this script, my site going in very slow speed. And after click any button for go to checkout page, I aways need tip F5 in keyboard for resume play..

IE 8, Im use Windows XP for tests.. (yes, in Brazil Mastercard uses IE 8 and Win XP for validation afiliations.. 👎 )

My scripts:

        'bundles/frontend/js/lib/jquery-1.9.1.js'
        'bundles/frontend/js/lib/underscore.js'
        'bundles/frontend/js/lib/diacritics.js'
        'bundles/frontend/js/lib/bootstrap-2.3.1.js'
        'bundles/frontend/js/lib/jquery-ui-1.10.2.custom.js'
        'bundles/frontend/js/datepicker-translations.js'

thnks