The Million Users Challenge
LeaderboardA feed API on Postgres, any language, on a 16-core box with Postgres on its own machine. The best server in the video held 665,000. Nobody has reached a million yet.
| Rank | Implementation | Users held |
|---|---|---|
| 1 |  csharp ASP.NET Core + Npgsql · the video's server | 665,000 |
| 2 |  node Fastify 5 + node-postgres, node:cluster workers · the video's server | 587,000 |
| 3 |  rust axum + SQLx · the video's server | 413,000 |
| 4 |  java Spring Boot 3.5 (Tomcat, virtual threads) + HikariCP + pgjdbc · the video's server | 321,000 |
| 5 |  go Gin + pgx/v5 pgxpool · the video's server | 248,000 |
| 6 |  python FastAPI on Gunicorn/Uvicorn workers + asyncpg · the video's server | 213,000 |
How it was run
The machine. A 16-core app server, with Postgres 18 on its own 16-core box, both on Ubuntu 24.04. Load comes from separate load-generator machines.
How each entry is scored. After a 3-minute warm-up, two-minute runs double the users until one fails, then narrow down to within 5%. A 5-minute hold confirms the number, stepping down 5% until one passes. The score is the most users held for 5 minutes with p95 under 500 ms, p99 under 1 s and under 1% errors.