What model and year is the mac and what OS is it on? Are you running any antiviral stuff or QoS package on it ? If so try turning it all off first
Can you do a "pure" speed test like this
Connect the Mac, via a NEW and working Cat5e/6a ethernet cable, directly to the Hub (use a RJ45 adapter for what ever port the Mac has). Then put the into “modem mode”
...or go into the Hub settings and turn off/disable the wifi and also disconnect all ethernet cables from the Hub. This ensures that NO other devices are connected
Test speeds at https://speedtest.samknows.com/
- or https://www.speedtest.net/
- try on 2 different browsers - as Chrome sometimes gives odd results.
What does that get
I do not work for VM. My services: HD TV on VIP (+ Sky Sports & Movies & BT sport), x3 V6 boxes (1 wired, 1 WiFi, 1 on PA) Hub5 in modem mode with Apple Airport Extreme Router +2 Airport Express's. On 250Mbps, Talk Anytime Phone, x2 Mobile SIM only iPhones.