behindthesource.co.uk
https://www.behindthesource.co.uk/
Ranks Overall #293 Built Awesome #230
Data from Oct 5, 2026, 8:27 AM UTC old Measured once a week · 7 runs since Aug 21, 2026
Elsewhere:
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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 | 1.89 s good | ↓ -285 ms (-13.1%) 1.89 s – 2.25 s | |
| INP CWV Interaction to Next Paint — field only, no lab run can measure it | n/a | — | |
| CLS CWV (estimate) Cumulative Layout Shift | 0.005 good | → no change 0.005 – 0.006 | |
| TBT Total Blocking Time | 1 ms good | ↓ -20 ms (-95.2%) significant 1 ms – 21 ms | |
| FCP First Contentful Paint | 1.88 s needs work | ↓ -3 ms (-0.2%) 1.88 s – 1.92 s | |
| Speed Index | 1.88 s good | ↓ -3 ms (-0.2%) 1.88 s – 1.92 s | |
| TTFB Time to First Byte | 617 ms good | ↑ +145 ms (+30.7%) 470 ms – 643 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 | 153 kB | ↓ -128 B (-0.1%) 153 kB – 153 kB | |
| Requests | 20 | → no change 20 – 20 | |
| Third-party Weight | 59.8 kB | ↑ +76 B (+0.1%) 59.2 kB – 59.8 kB | |
| Third-party CPU | 30 ms | ↓ -5 ms (-14.4%) significant 28 ms – 35 ms | |
| Unused JS | 0 B | → no change 0 B – 0 B | |
| Unused CSS | 21.3 kB | → no change 21.3 kB – 21.3 kB |
By resource type
| Type | Transfer | Share | Size | Requests |
|---|---|---|---|---|
| script | 42% | 61.7 kB | 4 | |
| image | 31.6% | 46.4 kB | 7 | |
| font | 17.4% | 25.6 kB | 1 | |
| other | 3.7% | 5.5 kB | 4 | |
| document | 2.6% | 3.9 kB | 1 | |
| stylesheet | 2.6% | 3.8 kB | 1 | |
| Total | 153 kB | 20 |
Third parties 2 entities
| Entity | Transfer | Size | Main thread Simulated |
|---|---|---|---|
| Netlify | 55.4 kB | 28 ms | |
| microanalytics.io | 4.5 kB | 2 ms | |
| Total | 59.8 kB | 30 ms |
Page health
| Metric | Value | Change / range | Trend |
|---|---|---|---|
| Main Thread Work | 354 ms | ↓ -47 ms (-11.6%) significant 331 ms – 400 ms | |
| Long Tasks | 1 | ↓ -1 (-50%) 1 – 2 | |
| DOM Elements | 115 | → no change 115 – 115 | |
| Axe Violations Violating nodes from a full Axe CLI run (more than Lighthouse reports) | 0 | → no change 0 – 0 | |
| A11y Failures | 0 | → no change 0 – 0 | |
| A11y Failing Nodes | 0 | → no change 0 – 0 |
Main thread work
| Task | Time | Share | Duration Simulated |
|---|---|---|---|
| other | 34% | 121 ms | |
| script evaluation | 31% | 108 ms | |
| style layout | 20% | 71 ms | |
| script parse compile | 7% | 25 ms | |
| parse HTML | 5% | 17 ms | |
| paint composite render | 3% | 11 ms | |
| Total | 354 ms |
Axe violations axe-core 4.13.0, full rule set
0 violating nodes across 0 rules, 204 passing. This is a standalone Axe CLI run and is stricter than the subset Lighthouse already includes.
Hygiene
Measurement log
Every stored run for this URL, newest first.
| When | Scores | Perf | LCP | CLS | TBT | Weight | Runs | Spread | Bench | Took | Archive |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Oct 5, 2026, 8:27 AM UTC | 98 | 1.89 s | 0.005 | 1 ms | 153 kB | 3/3 | ±1 | 2,406 -3% | 23s |
|
|
| Sep 28, 2026, 3:55 AM UTC | 97 | 2.18 s | 0.005 | 21 ms | 153 kB | 3/3 | ±2 | 2,497 0% | 25.6s |
|
|
| Sep 21, 2026, 1:01 AM UTC | 98 | 1.91 s | 0.005 | 2 ms | 153 kB | 3/3 | ±4 | 2,329 -6% | 29.8s |
|
|
| Sep 13, 2026, 11:00 PM UTC | 97 | 2.25 s | 0.005 | 12 ms | 153 kB | 3/3 | ±8 | 2,485 0% | 25.7s |
|
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| Sep 6, 2026, 9:09 PM UTC | 98 | 1.92 s | 0.006 | 9 ms | 153 kB | 3/3 | ±5 | 2,471 -1% | 25.5s |
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|
| Aug 30, 2026, 8:42 PM UTC | 98 | 2.06 s | 0.006 | 11 ms | 153 kB | 3/3 | ±8 | 2,697 +8% | 24.7s |
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| Aug 21, 2026, 5:33 PM UTC | 98 | 1.90 s | 0.006 | 1 ms | 153 kB | 3/3 | ±3 | 2,420 -3% | 24.7s |
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Embed this score
Use this web component to show behindthesource.co.uk's scores on any website, updated whenever this instance re-measures. Don’t forget to bundle the speedlify2-score.js component code into your site!
<speedlify2-score speedlify-url="https://www.speedlify.dev/" url="https://www.behindthesource.co.uk/"></speedlify2-score>