What is FCP?
First Contentful Paint measures the time from navigation until the first text, image, SVG or non-white canvas content is rendered. The official web.dev guidance describes 1.8 seconds or less as a good experience at the 75th percentile.
Original research / Website rebuild / 2026
What changed when Markou Design London was rebuilt?
A transparent before-and-after record of six technical and search-readiness metrics from the Markou Design London website rebuild. The results show meaningful progress, while the methodology notes explain exactly what this dataset can—and cannot—prove.
Published29 July 2026
AuthorSatyam Patil
LicenceCC BY 4.0
What moved?
The rebuild improved every recorded measure. Mobile performance increased from 63 to 90, while First Contentful Paint fell from 4.3 seconds to 0.9 seconds.
The largest remaining performance constraint was LCP. It improved by 5.9 seconds, from 9.1 to 3.2 seconds; however, 3.2 seconds was still above Google's published 2.5-second “good” threshold and should not be presented as finished work.
63→90Mobile performance score
| Metric | Before | After | Change | Interpretation |
|---|---|---|---|---|
| Mobile performance | 63 | 90 | +27 points | Higher is better |
| First Contentful Paint | 4.3 s | 0.9 s | −3.4 s | 79.1% faster |
| Largest Contentful Paint | 9.1 s | 3.2 s | −5.9 s | 64.8% faster |
| AEO readiness | 25 | 100 | +75 points | Higher is better |
| AI-SEO / GEO | 53 | 89 | +36 points | Higher is better |
| Accessibility | 97 | 100 | +3 points | Higher is better |
How should the numbers be read?
This is a diagnostic case-study dataset, not a controlled industry benchmark. It records the supplied summary values from before and after one client rebuild.
The public source material did not retain raw Lighthouse exports, audit timestamps, device profiles or tool-version identifiers. Therefore, the dataset reports the values accurately but does not claim laboratory reproducibility or field-performance equivalence.
What is LCP?
Largest Contentful Paint reports when the largest visible image, text block or video is rendered. The official web.dev guidance sets 2.5 seconds or less as the good threshold at the 75th percentile.
What are AEO and GEO scores?
These are third-party diagnostic scores for answer-engine and generative-engine readiness. Unlike Core Web Vitals, they are not standardised web-platform metrics, so they should be interpreted within the scoring tool rather than compared across unrelated tools.
What supports this study?
Primary sources define the web-performance metrics, while the live client and delivery websites establish the subject and project relationship. The downloadable files reproduce the complete published dataset.
- web.dev: First Contentful Paint
Official definition, measurement context and good threshold for FCP.
- web.dev: Largest Contentful Paint
Official definition, measurement context and good threshold for LCP.
- Google PageSpeed Insights release notes
Explains changing Lighthouse versions and diagnostic conditions.
- Markou Design London
The live website that forms the subject of this rebuild study.
- Rock & Blu Ltd
The software development and IT consultancy that delivered the rebuild.
Dataset licensed under Creative Commons Attribution 4.0. Attribution: “Satyam Patil / Rock & Blu Ltd, Markou Design London website rebuild results, 2026.”