If you find this, you prob also have had issues with running the game, specifically you have really poor fps even though you are running a modern rig.

First things first, be sure to do this AFTER you've already set up your general settings in the configuration tool when you launch the game. Whenever you temper with those, it resets the value that we are going to change manually in this guide. If you change those settings after modifying the ini file manually, you'll have to redo this. Also, BE SURE TO HAVE YOUR GAME CLOSED, better safe than sorry! You can also set the ini to read only after you're done editing it for good measure.

Anyway, this is what did the trick for me:

Head to Documents\Witcher 2\Config and once there open up User.ini (Use whatever document editing software you have, notepad does the job well enough in this case)

Find TextureMemoryBudget in there (remember, you can use "CTRL + F") and change it to whatever your VRAM in MB is, subtracting 1024. If you were to set it to more than 4084, just set it to 4084 instead, as thats a safe point for the game. For RTX and AMD cards, it is recommended to just change TextureMemoryBudget value to 1024 for good measure. There are lots of options for finding out what value would be appropriate for you, if you don't know it already, simply look up "how do I know how much VRAM I have" on google and you will find your way.

Hope this helps. Enjoy the game!