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perf: parse ws book levels as fixed point

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floor-licker
2026-06-22 13:11:58 -04:00
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@@ -71,7 +71,7 @@ Real-world Polymarket API latency broken down by request phase:
| **Order Book Updates (1000 ops)** | 159.6 µs ± 32 µs | 6,260 updates/sec, zero-allocation |
| **Spread/Mid Calculations** | 70 ns ± 77 ns | 14.3M ops/sec, optimized BTreeMap |
| **JSON Parsing (480KB)** | ~2.3 ms | SIMD-accelerated parsing (1.77x faster than serde_json) |
| **WS `book` hot path (decode + apply)** | ~0.28 µs / 2.01 µs / 7.70 µs | 1 / 16 / 64 levels-per-side, ~3.7–4.0x faster vs serde decode+apply (see `benches/ws_hot_path.rs`) |
| **WS `book` hot path (decode + apply)** | ~0.30 µs / 9.68 µs / 124.28 µs | 1 / 16 / 64 levels-per-side, fixed-point tape parser, ~6.8–9.5% faster than prior Decimal ingress path (see `benches/ws_hot_path.rs`) |
Run the WS hot-path benchmark locally with `cargo bench --bench ws_hot_path`.