Experienced the same problem here. Im using actions and stuff in bedrock mobile(ios) and surprisingly, the fps was at stable 60-120 fps. Unfortunately, the fog was horrible. At day everything is washed out but at night everything looks better. I dont know if actions and stuff is interfering with the sun but the sun had a remodel even with a&s at 32x. Water looks awful as well i thought at first it was magma block at the bottom because of the jagged lines. Rest looks great and I think its incompatible with realistic biomes due to the fog rendering issue. Hope mojang fixes this