remove infinite animation that triggers continious style recalculation...

It looks like this bugfix only applies to obsolete webkit browsers and causes continuous style recompilation (and therefore relatively high cpu load / power consumption) in modern webkit browsers.

The effect is currently quite pronounced on this page http://foundation.zurb.com/docs/components/switch.html (view in chrome or safari) vs the rest of the foundation docs. I'd suggest throwing a few switches on a clean page and tinkering with this animation setting if you have any doubts.