MTGA is very resource demanding, particularly on the GPU. Batteries are drained extremeley fast and you cannot assume that a default laptop graphic card will run the application fluidly (even when not using an external screen and with minimal settings).

From what I see, the game is mostly static so I wonder what is taxing the resources. I hope you can come up with ideas lighten the load to or to speed up the program start (which can be reaaaallly long)

Maybe some background animation can be disabled as an option