Thanks for all the suggestions, I will note that.   It seems it started working by itself 15 minutes later.  There must be a built in watchdog timer or something to reboot its web interface.   I'm in it today completing the bios updates as needed for my 4 ESXi server blades in this chassis.  I'm also in our other FX2 chassis no problem.  
I have 3 Dell FX2 chassis.  One of them in the CMC management web page was running terribly slow.  I want to idrac to one of the server blades to watch a reboot for a vmware update.  I also wanted to update the bios.  The web gui was so unbearably slow that I canceled out and tried alternative browsers and computers.  Chrome, Firefox, IE, 3 different machines, they all say that it timed out.  I can ping it no problem. I check the switches and I use arp to find the port its connected to.  I disable and enable the ethernet port.  Still nothing.  Ping works but I can't access the web gui. How can I remotely reset the CMC web gui?  Will it eventually just restart itself?  Is there some kind of built-in watchdog that will reset it?  If not there should be.
Dell FX2 CMC not responding in web browser