[Hummingbird] Hummingbird performance test failing – Admin very slow

In general, my admin has been very slow the last couple of days. I was using Hummingbird to try to speed things up. My latest attempt at running a performance test resulted in the following error:

"The performance test didn't return any results. This probably means you're on a local website (which we can't scan) or something went wrong trying to access WPMU DEV. Try again and if this error continues to appear please open a ticket with our support heroes"