KC Jabla Shoulder Button - Orange

Yes, you're mostly right, but with an important nuance.

For a simple database fetch:

• The database usually determines most of the latency (query execution, indexes, disk I/O, caching).

• Network latency and connection pooling also play a significant role.

• The application server (Node.js, Go, Rust) is often just waiting for the database to respond.

Node.js's event loop is very efficient at handling thousands of concurrent I/O operations because it doesn't block while waiting for the database. Go achieves similar scalability using goroutines, and Rust does so with async runtimes like Tokio. For I/O-bound workloads, all three can achieve excellent performance.