Here it is:
> Turn your graphic low
> Compatibility on
> Render off
> Cull Transient on
> Anti aliasing x1
> Reduce the resolution! (Very important)
> Open task manager and find java.exe. Set it's priority to High. (Ultra important!)
Hope it helps. If this still doesn't fix it, you need a better internet connection. Move to General Discussion so everyone will read it.
It also helps if you have a good computer that can handle a horribly programmed java game. Oh wait only three people have those.