Dungeon Cell sprite stress test 2 to 524288 sprites

Testing for a new game I'm noodling on. Stable 120fps until about 20,000 sprites. After that we start dropping frames. At 100,000 or so sprites we can hold 30fps but this game probably only needs to support about 100-1000.
Each sprite is running through idle animation frames and is wandering to a random movable tile (no pathing).