Check on the Asus that QoS isnt activated - its a common cause of reducing speeds on single connections.
is that over a new Cat5e/6a ethernet cable? - old ones can and do fail - and often then drop to 100Mbps.
What Upload speeds do you get will be ~10 if still on a 100 package and ~35Mbps if correctly on a 350 package
Wifi speeds may be limited if its connecting on the 2.4 GHz Band
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John
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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.