Slower internet from ucg max

Just upgrade my internet to 2.5 gigs. I am getting around 2.2 to my unifi UCG Max (2.5 gig in and out ports). When I connect cat6 to my computer with a 2.5 gig ethernet usb port I only get about 750 megs. Tried this same ethernet adapter on other computers and get around the same. Also tried switching the cat6 just in case but same results so this seems to point to the ucg max. Anyone have a fix for this if possible?

Ad blocking is off
Tried turning off intrusion prevention

Thanks

I would try to setup an iperf test on 2 pc’s that are connected to the the router and see if you getting the appropriate throughput.