I have an application deployed on Railway with a Postgres database and the user's latency is consistent 150ms. The same application deployed on these serverless/edge provider is anywhere between 300-400ms with random spikes to 800ms. The same application, same data, and same query.
The edge and serverless has to be the biggest scam in cloud industry right now.
They aren't faster, and they aren't cheaper. You could argue they are easier to scale, but that not he case anymore since everyone provides autoscaling now.