Did the requirements of the game got higher or is the demo a bit less optimized?.
Requirements did get higher, that's why I added a demo to check if you can run it first.
This is mostly because of the amount of additional content, along with the addition of post processing and particles.
I am currently looking into how to optimize it better
I was able to pinpoint the issue, which was the size/quality of the images. I did add files called 'BetterPerformance' that should resolve this, but in return the quality of the visuals are reduced by half.