[Conte Zero]

Fps decrease?, I have it, but never install it, I like to manually install the mods and as this was an .exe

The .exe just installs the application, then the application works on the original clouds (higher definition and bigger cloud textures are provided during the install)
With a recent pc, no problems. Some fps decrease may occur on older machines if you set huge clouds and max settings, just in that case.
It's worth a try; uninstaller is eventually very simple and clean.