If you want consistency, you have to pay for it with latency, since the system has to do work in the background to ensure that the data you read is really the latest.
If you care more about latency than consistency you have an 'eventually consistent' system, where a write will eventually propagate, but a read might get stale data.
If you care more about latency than consistency you have an 'eventually consistent' system, where a write will eventually propagate, but a read might get stale data.