pg_dump / outbound postgres traffic slow/capped?

I'm trying to create a local backup of my production database (±20GB) using pg_dump. This is however taking ages, seeing outgoing network of my database being <1 MB/s at any time. At least around 0.3MB/s at any second. Is there a cap at the outbount network from Postgres instances? I have completely shutdown any other activity to the database to ensure it is not locking up on other transactions etc. We're 90 minutes in and still not completed, which is no surprise is the outgoing traffic is this slow. My local internet is not the problem.