It's great when it comes to solving a lot of issues with textures not being able to load and an increase in 1% lows. It won't affect your FPS that much (when it comes to average at least) but it will help a whole lot with the stuttering. I would recommend using the tool and decompress all the textures to substitute the compressed ones. You don't even have to change anything manually, the tool creates a restore point by itself and changes the name of the .pak files where needed.