Test on a known "good" ethernet cable (Cat5e/6) connected to a GB enabled computer/laptop, with up to date drivers with the Hub in modem mode. Test at speedtest.net to your nearest VM server - try 2 different browsers.
If they are still low – boot the device into safe+networking mode and try again.
There are many posts on here where unknown software, corrupted browsers or other connected devices are limiting speeds on tests.
Report back what that gets.
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John
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My services: HD TV on VIP (+ Sky Sports & Movies & BT sport), x3 V6 boxes (1 wired 2 WiFi,) SH2 in modem mode with Airport Extreme Router. On VIVID200, Talk Anytime Phone, x2 Mobile SIM only iPhones.