Originally Posted by RCK
Go to the board with IE10, launch Dev tool with F12 key, start a network capture and profiler capture, then navigate on EAB.
When a lag happen, return back to dev tool and stop the both captures, look at the end of Network capture and try to see if one http request is slow or not responding.
I captured a hang, the very last line of the network capture showed a 32 second delay. The Profiler showed only small delays. Both files are attached. I did it several times and saw as much as a 60 second delay.