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https://www.ryanair.com

Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
86
GRADE
B
FIX
2
REVIEW
3
PASS
9
INFO
2

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

Mobile Desktop
36
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
93
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.

5.71 s

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

9.04 s

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

1.39 s

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

0.002

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

5.71 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.

10.03 s

Page Load Progression

523 ms
1.0 s
1.6 s
2.1 s
2.6 s
3.1 s
3.7 s
4.2 s
Checks
16
9 PASS 3 REVIEW 2 FIX
F
JS Execution Cost
Action
5172ms total JS execution
FIX
5172ms total JS execution
Warning::
https://polyfill.ryanair.com/?features=intersectio...: 3693ms CPU time
Warning::
Unattributable: 731ms CPU time
Warning::
https://www.ryanair.com/nl/nl: 584ms CPU time
Info::
https://www.ryanair.com/homepage_dist/mobile/main....: 163ms CPU time
Warning::
Third-party scripts: 4425ms (86% of total)

Main Thread Breakdown

Script Evaluation 64% Other 23% Style & Layout 9%
ScriptTotalScriptingParse/CompileParty
https://polyfill.ryanair.com/?features=intersectionObserver,smoothscroll3693ms3177ms10ms3rd
Unattributable731ms22ms0ms3rd
https://www.ryanair.com/nl/nl584ms12ms3ms1st
https://www.ryanair.com/homepage_dist/mobile/main.faf5dba9c7a67dab.js163ms93ms15ms1st
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, 63 requests
REVIEW
1.6 MB transferred, 63 requests
Info::
Page weighs 2.6 MB (1.6 MB transferred)
Warning::
JavaScript is 603 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 603 KB
Info::
63 HTTP requests
Info::
Estimated 0.34 g CO2 per page load
1.6 MB / 2.4 MB budget
1.6 MB transferred
63 requests
0.34 g CO2 per page load
Other 661.3 KiB 40%
JavaScript 603.0 KiB 36%
Other 294.9 KiB 18%
Images 55.0 KiB 3%
Fonts 34.0 KiB 2%
HTML 12.8 KiB 1%
Other 1.5 KiB 0%
Other 390 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

C
JS Bundles
Action
9 scripts, 239 KB unused
REVIEW
9 scripts, 239 KB unused
Warning::
https://www.ryanair.com/homepage_dist/mobile/main....: 239 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 239 KB
239 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.ryanair.com/homepage_dist/mobile/main.faf5dba9c7a67dab.js558 KB239 KB (43%)✓1st
https://polyfill.ryanair.com/?features=intersectionObserver,smoothscroll17 KB—✓3rd
https://www.ryanair.com/homepage_dist/mobile/runtime.2e11f457ae73699b.js10 KB—✓1st
https://www.ryanair.com/homepage_dist/mobile/2096.ddba208f1604d5a3.js1 KB—✓1st
https://www.ryanair.com/homepage_dist/mobile/1611.f295f37af1e33ca5.js14 KB—✓1st
https://www.ryanair.com/homepage_dist/mobile/6235.b6aab2fdf19a33ca.js2 KB—✓1st
https://www.ryanair.com/homepage_dist/mobile/4695.26eb2901f84bfa60.js1 KB—✓1st
https://www.ryanair.com/flightselect_dist/mobile/runtime.df295e9ecb61e218.js12 KB—✓1st
https://www.ryanair.com/flightselect_dist/mobile/main.84ee13449c7ccc96.js634 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 (102.6 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
Image Optimization
17 images, 0 KB saveable
PASS
17 images, 0 KB saveable
Info::
All images are well-optimized
17 images 55 KB
0 oversized -0 KB
2 legacy format
0 missing dimensions CLS risk
A+
Font Loading
3 fonts (34 KB)
PASS
3 fonts (34 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

34 KB total

Render-blocking

0

of 3

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 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s 9.0 s FCP 5.7 s LCP 9.0 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: swaphttps://assets.ryanair.com/resources/ui/fonts/roboto-500.latin.woff2roboto-500.latin.woff2 https://assets.ryanair.com/resources/ui/fonts/roboto-500.latin.woff2 — 11.4 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
roboto-500.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
14 hints, 0 missing preconnects
PASS
14 hints, 0 missing preconnects
Info::
Page uses 14 resource hint(s)

Current Resource Hints

preconnect
+2
12
preload
—
dns-prefetch
—
prefetch
2

14 resource hints configured

A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
Network Waterfall
63 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
86% of JavaScript execution is third-party
First-party Third-party 4425ms · 17KB · €77/mo
polyfill.ryanair.com
Other
Costly
Execution 3693ms
Transfer 17 KB
Monthly Cost €64/mo
Unattributable
Other
Costly
Execution 731ms
Transfer 0 KB
Monthly Cost €13/mo

These scripts may cost more than they're worth

  • polyfill.ryanair.com adds 3693ms and costs ~€64/month
  • Unattributable adds 731ms and costs ~€13/month

86% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

polyfill.ryanair.com takes 3693ms 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 731ms 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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