---
title: "Benchmarks"
description: "Measured, reproducible, honest: dev cold start, HMR latency, data-layer numbers — with the scripts to re-run them."
canonical: "https://june.build/benchmarks"
---
# Benchmarks

Apple Si dev machine, 10 physical cores — ratios and shapes, not absolutes. Every number traces to a named script + date — re-run it,
don't trust it. Runtime-section numbers come from the experimental native
runtime track (not the v0.1 default host).

## Dev experience
| metric | value | context | run |
| --- | --- | --- | --- |
| dev cold start (hello-world) | **59ms** | median; next dev: seconds; Vite-class | `scripts/bench-dev-start.ts` · 2026-06-10 |
| HMR save → flight pushed | **73ms** | median 8/8, healthy at 400ms rapid-save cadence; browser apply +≈10ms; the push loop IS production live-RSC | `scripts/bench-hmr.ts` · 2026-06-10 |

## Runtime
| metric | value | context | run |
| --- | --- | --- | --- |
| V8 isolate boot (snapshot) | **11.9ms** | 10× vs no snapshot | `PROBE=1 runtime-next/target/release/june-runtime` · 2026-06-10 |
| bundled+snapshot first render | **21.8ms** | the M3 target proof | `PROBE=1 runtime-next/target/release/june-runtime` · 2026-06-10 |
| cold start vs bare workerd | **82ms vs 78ms** | spawn→first-200, same React-SSR hello fixture — par; warm trivial-page p50 3.1ms vs 0.35ms (pool-hop overhead = next lever) | `bench/workerd-waterfall/measure.ts` · 2026-06-10 |
| SSR load curve (POOL=8) | **4.7k rps peak** | knee c≈16-32, p99 10ms at knee; ~470 rps/core whole-machine | `bench/sweep.ts` · 2026-06-10 |

## Data layer
| metric | value | context | run |
| --- | --- | --- | --- |
| native sqlite point lookup (Rust op in V8) | **0.77µs** | ≈ 1.1× bun:sqlite, 29× WASM | `experiments/orm-bench (deno-sqlite-op)` · 2026-06-10 |
| render-level auto-batch on Cloudflare D1 | **8.8×** | vs concurrent per-component queries (11.5× vs sequential) | `experiments/orm-bench/edge-d1 /render-bench` · 2026-06-10 |
| Postgres pipelining | **48k ops/s** | 3.9× sequential (12.2k), batch=50, single connection | `experiments/orm-bench/pg-rust-pipeline` · 2026-06-10 |