Edge 840 terrible USB connection speed

Have been using various Fenix watches for many years but that's my very first Edge one (that's planned to be used as an external display only, but TBD).

The very first thing I've noticed is the terrible USB connection speed and wondering if anyone has or had the same issue. A simple read ops of a directory literally can take 1-3 mins. A 2Gb file is planning to be copied for 40 mins!

Laptop is a MacBook Pro and using a native Apple USB-C cable. Using the same cable with a cheap USB-C <-> Fenix watch adapter on the same laptop, the above-mentioned file copy took under 2 mins. So the issue is definitely not with the laptop or cable but within the Edge itself.