I've a problem that sometimes the network response to the internet is slow. When I connect directly to the modem no problems but when the data travels throw the internal network its much slower. Normal internet pages have no problem, but we are using a program/website that have to load PDF pages. This is much slower when it have to travel throw our network and after time its become slower and slower.
Now I have installed an Rapsberry Pi with the QoS monitoring and the RTT is around 20ms. The network is as follows. ISP modem vlan1>switch1>switch2>switch3>switch4>vlan1 Firewall/Fortigate vlan2 >switch4>switch3>switch2>switch1>workstation.
ISP wan adres is travel over vlan 1 to the fortigate firewall and then travels back over vlan 2 to the client. The raspberry Pi is also connected to switch 1 and PRTG is on switch 4 both in the same vlan.