Every time the Ender Dragon fires a purple ball the game either lags for about a not doing anything for a minute or crashes and closes software. very annoying. you need to defeat the dragon in about 20 seconds or the end is useless.

Reproduce

1. Check that render distance is 6 and particle render distance is 0.
2. Go to end 
3. Get shot at by dragon
4. waaaaa death by lag!!!