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https://www.ryanair.com

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
86
GRADE
B
FIX
2
REVIEW
4
PASS
6
INFO
2

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
52
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
96
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

1.57 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

2.90 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

548 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.045

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

2.13 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

2.91 s

Page Load Progression

552 ms
1.1 s
1.7 s
2.2 s
2.8 s
3.3 s
3.9 s
4.4 s
Checks
14
6 PASS 4 REVIEW 2 FIX
D
JS Execution Cost
Action
2186ms total JS execution
FIX
2186ms total JS execution
Warning::
https://polyfill.ryanair.com/?features=intersectio...: 1135ms CPU time
Warning::
https://www.ryanair.com/homepage_dist/desktop/main...: 434ms CPU time
Warning::
https://www.ryanair.com/nl/nl: 332ms CPU time
Warning::
Unattributable: 285ms CPU time
Warning::
Third-party scripts: 1419ms (65% of total)

Main Thread Breakdown

Script Evaluation 62% Other 21% Style & Layout 13%
ScriptTotalScriptingParse/CompileParty
https://polyfill.ryanair.com/?features=intersectionObserver,cssVars,objectFit1135ms953ms2ms3rd
https://www.ryanair.com/homepage_dist/desktop/main.da34040018a53c11.js434ms392ms6ms1st
https://www.ryanair.com/nl/nl332ms3ms1ms1st
Unattributable285ms5ms0ms3rd
D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: no-store
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-store

DirectiveValueMeaning
no-store—Never cache this response
C
Page Weight Budget
Action
1.6 MB transferred, 96 requests
REVIEW
1.6 MB transferred, 96 requests
Info::
Page weighs 3.5 MB (1.6 MB transferred)
Warning::
JavaScript is 777 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 777 KB
Info::
96 HTTP requests
Info::
Estimated 0.34 g CO2 per page load
1.6 MB / 2.4 MB budget
1.6 MB transferred
96 requests
0.34 g CO2 per page load
JavaScript 776.6 KiB 47%
Other 661.1 KiB 40%
Other 129.3 KiB 8%
Images 35.6 KiB 2%
Fonts 22.6 KiB 1%
HTML 12.8 KiB 1%
Other 1.5 KiB 0%
Other 388 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Approaching limit

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

B
Image Optimization
27 images, 0 KB saveable
REVIEW
27 images, 0 KB saveable
Info::
All images are well-optimized
27 images 36 KB
0 oversized -0 KB
5 legacy format
0 missing dimensions CLS risk
C
JS Bundles
Action
10 scripts, 253 KB unused
REVIEW
10 scripts, 253 KB unused
Warning::
https://www.ryanair.com/homepage_dist/desktop/main...: 253 KB unused (35%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 253 KB
253 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.ryanair.com/homepage_dist/desktop/main.da34040018a53c11.js730 KB253 KB (35%)✓1st
https://polyfill.ryanair.com/?features=intersectionObserver,cssVars,objectFit14 KB—✓3rd
https://www.ryanair.com/homepage_dist/desktop/runtime.a821d64f749d4a53.js10 KB—✓1st
https://www.ryanair.com/homepage_dist/desktop/2096.1de430d6b2119a7e.js1 KB—✓1st
https://www.ryanair.com/homepage_dist/desktop/4271.6552b846e08699bb.js1 KB—✓1st
https://www.ryanair.com/homepage_dist/desktop/1010.f2f9833b32b6d723.js1 KB—✓1st
https://www.ryanair.com/homepage_dist/desktop/3132.1f1cad4667cb0cc0.js15 KB—✓1st
https://www.ryanair.com/homepage_dist/desktop/3433.185d962500282c45.js5 KB—✓1st
https://www.ryanair.com/flightselect_dist/desktop/runtime.d4def03edbc4be58.js12 KB—✓1st
https://www.ryanair.com/flightselect_dist/desktop/main.acd1eaff4f7df2d6.js633 KB—✓1st

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Third-Party Impact
6% third-party, 0 ms blocking
PASS
6% third-party, 0 ms blocking
Info::
Third-party code accounts for 6% of page weight (103.3 KiB of 1.6 MiB)
Info::
Third-party blocking time is low (0 ms)
94%
First-party Third-party
A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
2 fonts (23 KB)
PASS
2 fonts (23 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

23 KB total

Render-blocking

0

of 2

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s FCP 1.6 s LCP 2.9 shttps://assets.ryanair.com/resources/ui/fonts/roboto.latin.woff2roboto.latin.woff2 https://assets.ryanair.com/resources/ui/fonts/roboto.latin.woff2 — 11.3 KiB — 0 ms — font-display: swaphttps://assets.ryanair.com/resources/ui/fonts/roboto-700.latin.woff2roboto-700.latin.woff2 https://assets.ryanair.com/resources/ui/fonts/roboto-700.latin.woff2 — 11.3 KiB — 0 ms — font-display: swap
roboto.latin.woff2 woff2 swap
Size 11 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
roboto-700.latin.woff2 woff2 swap
Size 11 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
96 requests over 0ms
INFO

Performance analysis not available for this result.

Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
65% of JavaScript execution is third-party
First-party Third-party 1419ms · 14KB · €25/mo
polyfill.ryanair.com
Other
Costly
Execution 1135ms
Transfer 14 KB
Monthly Cost €20/mo
Unattributable
Other
Costly
Execution 285ms
Transfer 0 KB
Monthly Cost €5/mo

These scripts may cost more than they're worth

  • polyfill.ryanair.com adds 1135ms and costs ~€20/month
  • Unattributable adds 285ms and costs ~€5/month

65% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

polyfill.ryanair.com takes 1135ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Unattributable takes 285ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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