As far as I know Neon has no filesystem cache, which is the most important performance enhancer for Postgres. As here are many using Neon already in production: Does anyone can comment on the performance for large databases (a couple of tables with around 100 million rows) compared to RDS / Supabase / other hosted service? I can imagine that it is substantially slower. But would be happy to be surprised, if not. Or to learn how Neon compensates the missing filesystem cache.
Neon engineer here. We implemented our own local cache between the pageserver and Postgres (called LFC). It compensates for the lack of a normal file system cache, and scales up with the rest of the autoscaling infrastructure.
