Every single connection to Postgres is a new process, which requires a fork and new memory allocation (at least 10MB plus whatever you need for your query).
PgBouncer opens a pool of connections and then reuses them each time a client asks for a connection. This reduces latency (no more fork) and overhead (reuse memory).
PgBouncer opens a pool of connections and then reuses them each time a client asks for a connection. This reduces latency (no more fork) and overhead (reuse memory).