So I've updated to version 1.3.2 (GMS2, 2.3.7.476) and I'm running your shader on 1080x1920 to get it to work fullscreen (on a Moto G6 phone). The game runs on a steady 60 fps, yet when your shader is enabled it drops to around 27 - 30 fps. Is there a way to improve the framerate? Maybe by reducing the render resolution or quality or something in those lines? On Windows the FPS rocks a steady 60 with your shader enabled.