Jose Manuel Jurado Diaz reviews a wait stat:
Today, I worked on a service request that our customer faced a performance issue in their business critical service tier database. Their main suspect was that the syncronization with the secondary replica has a delay.
During their troubleshooting process they found that they got many request with the wait type is HADR_SYNC_COMMIT.
Read on to learn more about this wait, including what can cause it. There’s also a bit of information about it in the SQLskills wait state compendium.