I need to do some benchmarking myself but it seems that even in a local region writes are in the 100s of ms. I'm aiming for my Lambda functions to be < 100ms so using Fauna seems difficult to work in.
Unless you meant I can limit "how global" my data is and that would improve write speeds?
The spanner approach could dynamically shift the leader location for parts of the key space, so writes that tend to be done from one location could avoid needing to communicate outside the local region.
Unless you meant I can limit "how global" my data is and that would improve write speeds?