You can tehoreticaly get 100 Mbit/s over regular VDSL2 (https://en.wikipedia.org/wiki/Very-high-bit-rate_digital_subscriber_line). Internet over cable-TV can be even faster. Almost the same speed as fiber optic cabels.
I do also recommend that you never use the buit-in wi-fi from ISP because of security reasons.
I do also recommend that you never use the buit-in wi-fi from ISP because of security reasons.