Looked at FDB but was instantly thrown off seeing 180ms to Ireland... What do these numbers represent? Is that a single ping, read, write or something else? https://app.fauna.com/status
As you can see, the write latency is pretty consistent regardless of source region, unlike databases like Mongo that are homed in a single location and fast from nearby but slower and slower the farther away the client application is.
If the application only lives in one place you are paying for the latency to reach the application from the remote client in the first place, even if the latency from the app to the database is "fast".
FaunaDB gives you local-latency reads and minimum global write latency from everywhere.