> ## Documentation Index
> Fetch the complete documentation index at: https://abxbus.archivebox.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Performance

> Performance notes and benchmark snapshots.

The parity performance suites use the same scenario layout across Python, TypeScript, Rust, and Go:

```bash theme={null}
uv run tests/performance_runtime.py --no-json
pnpm --dir abxbus-ts run perf:node
cargo test --manifest-path abxbus-rust/Cargo.toml --release --test test_eventbus_performance -- --nocapture
(cd abxbus-go && go test ./tests -run TestPerformance -count=1 -timeout=180s -v)
```

Measured locally on the same development machine used for the parity runs:

| Runtime           | 1 bus x 50k events x 1 handler   | 500 buses x 100 events x 1 handler | 1 bus x 1 event x 50k parallel handlers | 1 bus x 50k events x 50k one-off handlers | Worst case (N buses x N events x N handlers) |
| ----------------- | -------------------------------- | ---------------------------------- | --------------------------------------- | ----------------------------------------- | -------------------------------------------- |
| Python            | `0.366ms/event`, `0.188kb/event` | `0.408ms/event`, `0.153kb/event`   | `0.093ms/handler`, `10.197kb/handler`   | `0.633ms/event`, `0.145kb/event`          | `0.504ms/event`, `4.171kb/event`             |
| Rust              | `0.067ms/event`                  | `0.070ms/event`                    | `0.062ms/handler`                       | `0.077ms/event`                           | `0.227ms/event`                              |
| Go                | `0.016ms/event`                  | `0.011ms/event`                    | `0.085ms/handler`                       | `0.011ms/event`                           | `0.041ms/event`                              |
| TypeScript (Node) | `0.065ms/event`, `4.145kb/event` | `0.078ms/event`, `1.562kb/event`   | `0.065ms/handler`, `11.631kb/handler`   | `0.123ms/event`, `2.182kb/event`          | `0.344ms/event`, `12.619kb/event`            |

Notes:

* Python and TypeScript memory numbers are peak RSS deltas from their runtime harnesses.
* Rust and Go performance tests currently assert the `0.300ms` per event/handler budget for the measured scenarios but do not report per-event memory in the README matrix.
* Rust's 50k parallel handler budget is measured with `cargo test --release`; the debug build still runs the other Rust performance scenarios and ignores only that release-sensitive stress case.
* The current local Python row and TypeScript worst-case row are above the target budget in some scenarios and should be treated as performance follow-up items rather than baseline targets.