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Performance testing

Know when a change makes your app slower, and how much traffic it can take.

Why it matters

Slow is the bug nobody files. Each change adds a few milliseconds, nobody notices, and six months later the dashboard takes four seconds to load. Timing every run catches the change that did it while it's still easy to undo.

How it works

The first part runs on its own. Once a run comes back clean, your most important flows get timed, like loading the dashboard or placing an order. If a change makes one of them noticeably slower than usual, it shows up in the report like a failed test.

The second part is load testing, for when you need to know how much traffic you can take, say before a launch. I simulate lots of users at once, usually on a staging server, and show you what slows down or breaks first.

See one run, step by step

What you get

  • Page load, API response, and app start-up times
  • Slowdowns flagged against each flow's usual speed
  • Load tests sized to the traffic you expect
  • A written summary of what to fix first

Works with: Staging environments · Your CI pipeline · Slack and email alerts

What a report looks like

You get a summary like this after every change to main.

performance · main @ 4f2a9c1
env: Chromium · Pixel 8 · staging APIrun: 2026-06-09 09:44 UTC 1m 36s
11
passed
1
failed
0
flaky
  • dashboard › first load (usually 1.2s)1.3s
  • search › results (usually 0.4s)0.4s
  • checkout › place order (usually 1.8s)3.1s
  • api › GET /orders (usually 120ms)135ms
  • android › cold start (usually 1.9s)2.0s
Checkout took 3.1s against its usual 1.8s and stayed slow on every rerun, so it's flagged. The timing breakdown points at a new API call added in this change.

Want to see it on your app?

The first audit is free. Setup takes a few days, then a monthly plan keeps it running.

See pricing