Welcome to the site, 101237! (although I am not staff, I think I can welcome you here!) )
Oh, well it seems that you have some issues regarding your speed!
First of all, go to the CableNut tweak main thread! You will find there in the first post all the links you need to download the CableNut 4.08 tweak program. Install it, and after that download the CableNut settings zip file...that file contains the css settings file which needs to be opened by the main program and its settings saved to the registry! In order for this to happen you need to find the correct css file for your advertised speed...find it, load it into the program, back-up the registry first in case it doesn`t work out, apply the changes and reboot...then share another speed test with us!
Many cheers to you,lad!