Standards
Data Sources
CasinoPerflyn cites Google, W3C, IETF, MDN and HTTP Archive documentation, each with a date, and does not use vendor marketing claims as evidence. Below is what each source is good for and where each falls short.
Documentation and standards
| Source | Used for | Limits |
|---|---|---|
| Google Search Central | How Google Search treats Core Web Vitals | Describes Google Search only |
| web.dev | Metric definitions, thresholds, optimization guidance | Some articles are several years old; we cite the last-updated date |
| Chrome for Developers | CrUX methodology, Lighthouse scoring, browser APIs | Some features are Chromium-only |
| W3C | WCAG 2.2 accessibility criteria | Standards text, not legal advice |
| IETF RFCs | HTTP caching and real-time protocols | Technical specifications |
| MDN Web Docs | HTML and CSS features | Browser support changes over time |
Datasets
- Chrome UX Report (CrUX). Field data from opted-in Chrome users on eligible public pages. Excludes Chrome on iOS, Android WebView and other Chromium browsers. Accessed through PageSpeed Insights, Search Console and Google's APIs.
- HTTP Archive Web Almanac. Yearly analysis combining lab tests with CrUX data. We cite the 2025 Performance chapter, based on July 2025 data. Its figures cover the whole web, not casino sites in particular.
Tools
- Lighthouse and Chrome DevTools for lab traces, with the standard mobile throttling described in Lighthouse's documentation.
- Google's web-vitals library for collecting field data from real visits on your own site.
What we do not use
- Vendor marketing claims about speed improvements, unless independently documented.
- Unattributed statistics or "studies" without a method.
- Single Lighthouse runs presented as a site's performance.
- Measurements of operators' sites that we have not made and documented ourselves.
Sources
- Chrome for Developers, CrUX methodology, last updated June 20, 2024.
- HTTP Archive, Web Almanac 2025: Performance, published January 15, 2026, updated May 5, 2026.
- Google for Developers, About PageSpeed Insights, last updated October 21, 2024.
- GoogleChrome, Lighthouse throttling documentation, no date shown.
- GoogleChrome, web-vitals library, no date shown.