If you're a mobile gamer, reverse tethering your device to your computer might solve some wifi lag issues. As for tethering, you can share your wifi and mobile data connection to your computer. I haven't tested if it bypasses carrier tethering restrictions, but I have added an option to change your user agent from the app.
If you're interested, DM me your play store email address, and I'll send you the link to the app within 24 hours. Thanks!
Note: It doesn't require root, and it doesn't require USB debugging (except on Windows). You will also need to install a desktop companion app for it to work. I'll send the download links via email.