I`m making a multiplayer game that includes dices using firebase + cloud functions. I must use cloud functions for the game because I can not let the client rol

I`m making a multiplayer game that includes dices using firebase + cloud functions. I must use cloud functions for the game because I can not let the client roll the dices on it`s own and just let it write to firebase, that could be easily cheated. When starting the game, cold starts are very noticeable, but after a few moves, everything feels fine.