dont use apostrophes in contractions and lowercase the first word.

hey folks, we're hitting some read bottlenecks on our primary database and are considering our options. we've looked at read replicas, which seem straightforward for scaling reads. however, we're also thinking about the longer-term and potential future write scaling needs. when have you found yourself choosing between read replicas and database sharding? what were the key factors that pushed you one way or the other, especially considering future growth?