theguardian.engineering
https://theguardian.engineering/
Ranks Overall #431 Astro Showcase #14
Data from Oct 2, 2026, 7:00 PM UTC old Measured once a month · 1 run since Oct 2, 2026
Elsewhere:
PageSpeed Insights ·
Calibre ·
Treo ·
CrUX Vis ·
Tame the Bots ·
Scoring Calculator ·
Wayback Machine
Lab data is measured using Lighthouse, Mobile mode unless otherwise specified. Field data is reported from Chrome UX Report (using p75 measurements).
Stack
Lighthouse Scores LAB Simulated
Metrics LAB
No field data: the Chrome UX Report is not being collected for this project, so every figure below is from the Lighthouse run.
| Metric | Lab Simulated | ||
|---|---|---|---|
| Value | Change / range | Trend | |
| LCP CWV (estimate) Largest Contentful Paint | 2.33 s good | — 2.33 s – 2.33 s | |
| INP CWV Interaction to Next Paint — field only, no lab run can measure it | n/a | — | |
| CLS CWV (estimate) Cumulative Layout Shift | 0.043 good | — 0.043 – 0.043 | |
| TBT Total Blocking Time | 0 ms good | — 0 ms – 0 ms | |
| FCP First Contentful Paint | 1.96 s needs work | — 1.96 s – 1.96 s | |
| Speed Index | 1.96 s good | — 1.96 s – 1.96 s | |
| TTFB Time to First Byte | 605 ms good | — 605 ms – 605 ms | |
LCP Subparts LAB Unthrottled
The subparts attribute LCP to your server, resource discovery, download, or rendering. Note that the Lab LCP shown above is a simulated throttled estimate.
Page weight
| Metric | Value | Change / range | Trend |
|---|---|---|---|
| Page Weight | 2.34 MB | — 2.34 MB – 2.34 MB | |
| Requests | 19 | — 19 – 19 | |
| Third-party Weight | 106 kB | — 106 kB – 106 kB | |
| Third-party CPU | 0 ms | — 0 ms – 0 ms | |
| Unused JS | 0 B | — 0 B – 0 B | |
| Unused CSS | 0 B | — 0 B – 0 B |
By resource type
| Type | Transfer | Share | Size | Requests |
|---|---|---|---|---|
| image | 94.9% | 2.22 MB | 7 | |
| font | 3.5% | 81.8 kB | 4 | |
| script | 0.9% | 21.3 kB | 4 | |
| stylesheet | 0.4% | 9.2 kB | 2 | |
| document | 0.3% | 7.3 kB | 1 | |
| Total | 2.34 MB | 19 |
Third parties 1 entities
| Entity | Transfer | Size | Main thread Simulated |
|---|---|---|---|
| guim.co.uk | 106 kB | 0 ms | |
| Total | 106 kB | 0 ms |
Page health
| Metric | Value | Change / range | Trend |
|---|---|---|---|
| Main Thread Work | 418 ms | — 418 ms – 418 ms | |
| Long Tasks | 0 | — 0 – 0 | |
| DOM Elements | 129 | — 129 – 129 | |
| Axe Violations Violating nodes from a full Axe CLI run (more than Lighthouse reports) | 0 | — 0 – 0 | |
| A11y Failures | 0 | — 0 – 0 | |
| A11y Failing Nodes | 0 | — 0 – 0 |
Main thread work
| Task | Time | Share | Duration Simulated |
|---|---|---|---|
| other | 49% | 203 ms | |
| style layout | 24% | 98 ms | |
| script evaluation | 16% | 65 ms | |
| parse HTML | 6% | 24 ms | |
| paint composite render | 6% | 23 ms | |
| script parse compile | 1% | 5 ms | |
| Total | 418 ms |
Axe violations axe-core 4.13.0, full rule set
0 violating nodes across 0 rules, 289 passing. This is a standalone Axe CLI run and is stricter than the subset Lighthouse already includes.
SEO failures 1 of 8 audits
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meta-description— Document does not have a meta description
Hygiene
Measurement log
Field history 25 weeks
Weekly p75 from the CrUX History API, backfilled in a single request.
| Week ending | LCP | INP | CLS | FCP | TTFB |
|---|---|---|---|---|---|
| 2026-04-11 → 2026-09-26 | No data — 25 weeks under the CrUX reporting threshold | ||||
Runs
Every stored run for this URL, newest first.
| When | Scores | Perf | LCP | CLS | TBT | Weight | Runs | Spread | Bench | Took | Archive |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Oct 2, 2026, 7:00 PM UTC | 96 | 2.33 s | 0.043 | 0 ms | 2.34 MB | 3/3 | ±6 | 2,321 -7% | 22s |
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