Most times the Online Power Profiler doesn't even load the graphics, etc. 80% of the time it doesn't finish loading and I have to reload multiple times. I have a 1 Gigabit Per Second fiber internet connection and have no problems with the Infocenter or other websites. It is most definitely the recent changes which were made to accommodate the cellular power profiling. It is most definitely the DevZone and the worst is the Online Power Profiler for the nrf52 series.
I'm using Safari on a MacBook Pro. And yes, I did try it on Chrome and I did try it on a Windows computer. I'm located in Silicon Valley (California) if that makes a difference because of DNS or localized web services.