Make Rain more Efficient

Alright so rain is pretty laggy on realms/servers. The rain particles are handled serverside, which is completely unnecessary. surely the syncing of rain particles between clients can't be that important, so why not make the rain completely clientside. The only serverside parts would be the values controlling intensity and stuff, and the lightning/mob spawning. It would significantly help with realm hosting, and make it so that realm owners don't have to turn off rain just to get decent performance.