Not sure if you are looking for routing or WLAN or what, but routing, I can recommend VyOS.
Not sure if you are looking for routing or WLAN or what, but routing, I can recommend VyOS.
Looks like that router of yours is a modem router combo, if you go the path of new equipment you will need both or another combo device
Use iperf3 and connect to a server close to you to get a real measurement