So until now my general pattern with Apollo has been to fetch and cache data on the client. Then when I fire off am mutation I do an optimistic update to the cache, my UI immediately gets the optimistic update and the cache then updates once the mutation returns. So, say I have a component that displays a count of comments and then in a separate component I add a new comment, as part of the optimistic update I will write to the client cache to update the count so that my count component updates ahead of the mutation completing.