I don't know of an auto refresh on that page and have tested it my self. I would question if you have more than on QlikView Manage service installed and running? I have seen issues with this in the past.
I checked the services, I have a single instance of the QlikView Management Service running.
The server doesn't look like it's overloaded, it stays between 2% and 15% CPU activity (8 cores), and less than half (24Go) of the physical memory available beeing actually used.
Opening a single QMC session (either on the server or from a remote workstation) does not affect server activity ... until I go the System / Supporting Tasks tab and set the focus on the External programs treelist, which raises CPU activity to the 40%-60% range (and it stays that high until I leave the screen or select another item).
We use this tab to call small batch files that create OK / KO files used by the main scheduler to check task success, and to call iCacls and set permissions on files.
In case it's relevant, we currently have about 150 "external program" tasks.