FortiOS 7.4.8 Port Forwarding Performance

Have a customer that self manages their Fortinet 200F. They recently upgraded to 7.4.8 and have a server plugged directly into one of the ports on the device. They do some lite web hosting on that server and it was super fast until they upgraded. After the upgrade the port 80 and 443 performance has gone into the tank. Fortigate support remoted in and did iperf tests on about traffic and got speeds as expected so they closed the case.

Anyone have any good tips/places they can look at to see why performance for inbound port forwarding and tanked?