Wifi is really slow

[Aravisian]

If Windows is working at same distance and position, I agree that this is a driver communication issue, not router position issue.
Can you try the pcie_aspm=off grub parameter? (NOTE: you would be changing to using the pcie_aspm=off parameter, NOT the nomodeset parameter):

[HOW TO] add a grub parameter

There may be times that a user must add a specialized grub parameter in order to overcome an issue. The purpose of this guide is not to provide parameters, as that would be a case by case basis. It is to provide a guide on how to add one. To add a parameter, in a terminal (TTY, Recovery Prompt or Terminal Emulator) run: sudo nano /etc/default/grub Arrow key down to GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" and place your parameter within the quotation tags. For example if you are adding th…