I get 150 meg down and 30 up and I have never had a problem. Where I live I was lucky as we got FTTP very early in the rollout.
I think that one of the problems is that the mobile companies have been too successful in selling home broadband and cannot expand the network fast enough to keep up. I was with EE and would get 100 meg at 6am and 1 by 10am and never got a sensible answer why. I worked in the mobile radio sector for 15 years and know something about bandwidth and I think that your problem may be that 3 could be rationing 5g broadband so everyone gets something rather than a few getting a lot and the rest nothing. However, I do not know why 3's upload speeds always seem low. I suggest that before you jump ship you get a cheap sim and test their performance. If you don't like BT try Zen, they are a bit pricier than BT but never gave me problems. I would have stayed by BT retuced their prices and Zen would not but have now.
