Aurelion Sol gfx tuning

Every game whenever I play with an Aurelion Sol on either team my FPS drops by at least half my normal starting out and is 1/4 the normal during any fight or laning phase. This happens every time. My gfx settings are on Low, No Shadows, V-Sync off, basically as low as possible without being very low since that is all the higher they can go without crashing. Not sure if it is a GFX tuning issue or what but I can have any other 10 man combination and be fine without it going below 50 generally in fights. My reason to ban Aurelion Sol is specifically due to this GFX problem and others I speak with have the same problem on low/very low settings.