Asus 2.4 & 5 GHz super slow router

[polo_kiwi]

So i got this router today and it's AWFUL.
It's plugged in with an ethernet cable i used before which gave me a solid 500-1000mbs, yes i know ethernet is stable internet and wifi isn't, BUT THIS IS HORSE SH*T.

The router is plugged in with the Cat7 fiber cable.

I'm currently getting 9mb up 6mb down. What the f*ck? Compared to what was 300-300 or something. I don't know anything about the settings and the god damn manuals came in russian and german. Help!

 

[vmfantom]

To get meaningful help, please post the following:
-The actual Asus model number (like RT-AC88U, and not "AC1900" which refers only to the chipset's capabilities)
-The model of whichever router you had that gave you 300/300 before
-Your RSSI from a wifi analyzer app
-The number of other routers using the same Wi-Fi channels as you (WiFi Analyser will tell you this)