@Lucas-Amorim How exactly are you measuring the download speed? Ethernet cable or over WiFi?
If you connect a Ethernet cable from your router to the device you are using the speed tester on, then if it's showing 900mbps or thereabouts at the router via the cable, you're getting your advertised speed. If you're attempting to measure the speed via WiFi, then you could literally be sat right next to the router and get lower speeds.
Just so others are aware, it's perfectly possible to connect a Ethernet cable through a Ethernet adapter with a lightening connection to a mobile phone or laptop device without a standard Ethernet connection. Most recent laptops for example no longer have a Ethernet port and so an adapter must be used. I use the same thing when connecting my iPhone via Ethernet cable directly into my router.
