super low range?

so i just got xfinity installed and its mostly working fine, but i have extremely bad connection/low download speeds only a couple rooms away from where the router is. ik that walls of course can get in the way and reduce the speed, but it feels alot worse than it should be. should i just get an extender or xfinity pod? it just feels ridiculous that i can only get 40mb in my room (which is literally only like 30 feet away from the router) when i should be getting a gig or somewhere close