ajaxStart and ajaxStop issues in Firefox

I have a system using JQuery 1.1.3 and it has an ajaxStart and
ajaxStop function for a div id "ajax-loader" to show whenever ajax
stuff is being done.
This works smoothly in all browsers.
I just upgraded to JQuery 1.2.1 and it works smoothly in all browsers
except firefox where I get roughly a 2 second lag when these functions
are called. If i comment out the ajaxStart/Stop functions the lag is
gone.
Anyone know what the issue here is?