They typically won’t, if your using Ethernet then no is the short answer, but what a new router will do is extend the range and speed that can flow through the router wirelessly. I had a older net gear router then worked great but didn’t have great range and would drop speed over distance. I got a new Asus WiFi 6 router and it has been awesome I can go anywhere in my house and maintain 30 ping or less and 120 mb/s, but the first thing is to contact your WiFi provider if you don’t get your advertised speeds.