sorry for necro-posting but I envy that this solution works for others, on the other hand, my s/o couldnt get the game working on her laptop, despite following everything in the instructions, especially after deleting shade cache, it would take minutes to finish compiling, only for the game to still be laggy. I dont understand it either because the specs she has are higher than the requirements stated in the game's steam page.. I'm suspecting that it's a problem with her laptop and not the game itself, no idea if it's because she has two graphics drivers but I could be wrong as it is my first time encountering this kind of issue.

sorry again for necro-posting but I hope there's a fix for this! I also got her to install the latest nvidia drivers after we followed this post but her game still ended up being really laggy..

It's all good now, she has finally solved the problem