Infinity 1 speeds are advertised as up to 38Mbps, so if you're only paying for Infinity 1, you're doing alright (on the download speed, but I would question the upload). If you're paying for the top package (Infinity 2), you should get speeds of up to 76Mbps (I average about 68 when plugged in, and about 60 on wifi).
The other thing is that it takes about 10 days for the new fibre optic line to settle in, so they say.