0ms
main-thread blocking time (TBT), spec config
Speed proof · 2026-07-19
0ms main-thread blocking.
Lighthouse doesn't round up to prove it.
Run today against one.ie/chat with Lighthouse 13.2.0 on headless Chrome, mobile emulation. Not a benchmark deck — a report you can re-run in the next five minutes.
94
Lighthouse Performance, spec config
96 / 100
Best Practices · SEO — Lighthouse, spec config
545 KB
JS payload, Slow 4G preset
Speed
Speed is a measurement. Not a claim.
The page times itself while you read: page load, first token, latest audit — dated, reproducible, measured on the surface making the claim. The bars carry the proportions; ask the chat for the figures, dates attached.
Live — your browser measured this
This page loaded in—
First token of this chat—
Lighthouse measured
Fast network (rttMs=40, 10Mbps, 4× CPU)
Matches the config quoted in our own speed claims — so competitors aren't run under a harsher preset than we are.
| Site | Perf | A11y | Best Practices | SEO | TBT |
|---|---|---|---|---|---|
| one.ie/chat | 94 | 90 | 96 | 100 | 0ms |
| platform.openai.com/playground | 62 | 96 | 81 | 91 | 400ms |
| claude.ai (→ /login) | 26 | 97 | 54 | 92 | 1,280ms |
| chatgpt.com | 44 | 91 | 73 | 92 | 450ms |
Run-to-run variance is ±5 points on this test rig; differences under 5 are noise, not signal.
Slow 4G (Lighthouse's stock mobile preset)
The harsher, default test. Our Performance score drops under a throttled connection too — everyone's does — but the gap to competitors holds.
| Site | Perf | JS + assets transferred |
|---|---|---|
| one.ie/chat | 79 | 545 KB |
| chatgpt.com | 93 | 364 KB |
| platform.openai.com/playground | 37 | 969 KB |
| claude.ai | 26 | 6,132 KB |
How to re-run this yourself
Every number on this page comes from a Lighthouse CLI run against a live URL.
# Fast-network config (matches the numbers above)
npx lighthouse https://one.ie/chat --preset=desktop --throttling.rttMs=40 --throttling.throughputKbps=10240 --output=json
# Stock mobile preset (Slow 4G, harsher)
npx lighthouse https://one.ie/chat --output=json
Raw reports: text/build/lighthouse/*.report.json. Full write-up: text/build/lighthouse/comparison.md.
What I'll be honest about
Three gaps in this proof, named upfront — a caveat you find yourself costs more trust than one we hand you.
- ·ChatGPT now beats us on Slow 4G — 93 vs our 79, and a lighter payload (364 KB vs our 545 KB). Their page got dramatically lighter since our last check in May (it was 4.4 MB then). That's a real change on their end, not a mistake on ours, and we're naming it instead of quietly re-quoting the old comparison.
- ·Our own scores softened too — Accessibility 95→90, Best Practices 100→96 since May. On the follow-up list, not swept under the rug.
- ·claude.ai's score is for its logged-out /login redirect, not the authenticated chat app — an unauthenticated visitor never sees the heavier real interface, so the comparison likely undersells how much heavier Claude's actual app is.
- ·asi1.ai's numbers in the panel above are estimated, not measured — hover the bar and it says so. We haven't run Lighthouse against it yet; treat that row as a placeholder until it is.
"The faster you go, the more it feels like a different product."
— Patrick Collison, Stripe