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Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
4
REVIEW
1
PASS
9
INFO
2

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

Mobile Desktop
9
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
89
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
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.

9.78 s

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

73.29 s

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

8.04 s

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

0.356

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

9.78 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.

95.77 s

Page Load Progression

582 ms
1.2 s
1.7 s
2.3 s
2.9 s
3.5 s
4.1 s
4.7 s
Checks
16
9 PASS 1 REVIEW 4 FIX
F
Page Weight Budget
Action
21.3 MB transferred, 514 requests
FIX
21.3 MB transferred, 514 requests
Critical::
Page weighs 23.3 MB (21.3 MB transferred)
Warning::
Images are 11.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 11.2 MB
Warning::
JavaScript is 2.3 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.3 MB
Info::
Fonts are 366 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 366 KB
Warning::
514 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 4.5 g CO2 per page load
21.3 MB / 2.4 MB budget
21.3 MB transferred
514 requests
4.5 g CO2 per page load
Images 11.2 MiB 53%
Other 7.2 MiB 34%
JavaScript 2.3 MiB 11%
Fonts 366.0 KiB 2%
CSS 159.7 KiB 1%
Other 43.1 KiB 0%
HTML 32.7 KiB 0%
Other 1.8 KiB 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

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

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

F
JS Execution Cost
Action
18741ms total JS execution
FIX
18741ms total JS execution
Warning::
https://www.lufthansa.com/etc/designs/dcep/clientl...: 8131ms CPU time
Warning::
Unattributable: 3318ms CPU time
Warning::
https://www.lufthansa.com/digitalhangar/design-sys...: 2638ms CPU time
Warning::
https://www.lufthansa.com/us/en/homepage: 1442ms CPU time
Warning::
https://shop.lufthansa.com/booking/api/prefetch: 850ms CPU time
Info::
Third-party scripts: 4417ms (24% of total)

Main Thread Breakdown

Script Evaluation 64% Other 22% Style & Layout 7%
ScriptTotalScriptingParse/CompileParty
https://www.lufthansa.com/etc/designs/dcep/clientlib-all/vite/js/2d7ed8d4.chunk.js8131ms7651ms6ms1st
Unattributable3318ms256ms0ms3rd
https://www.lufthansa.com/digitalhangar/design-system/releases/v1.26.2/standalone/packages/maui-design-system.js2638ms2102ms17ms1st
https://www.lufthansa.com/us/en/homepage1442ms69ms16ms1st
https://shop.lufthansa.com/booking/api/prefetch850ms738ms6ms3rd
https://www.lufthansa.com/etc/designs/dcep/clientlib-all/vite/js/63ac1397.chunk.js844ms195ms1ms1st
https://www.lufthansa.com/etc/designs/dcep/clientlib-all/vite/js/app.07da5691.js373ms362ms1ms1st
https://www.lufthansa.com/cdn-cgi/challenge-platform/scripts/jsd/main.js325ms278ms3ms1st
https://www.lufthansa.com/etc.clientlibs/clientlibs/granite/jquery/granite.ed0d934d509c9dab702088c125c92b4f.js263ms251ms1ms1st
https://tags.tiqcdn.com/utag/lufthansa/main/prod/utag.js249ms147ms68ms3rd

Showing top 10 of 13 scripts

F
JS Bundles
Action
400 scripts, 852 KB unused
FIX
400 scripts, 852 KB unused
Warning::
https://www.lufthansa.com/etc/designs/dcep/clientl...: 167 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.lufthansa.com/etc/designs/dcep/clientl...: 150 KB unused (90%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.lufthansa.com/etc/designs/dcep/clientl...: 134 KB unused (51%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.lufthansa.com/etc/designs/dcep/clientl...: 76 KB unused (65%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.lufthansa.com/etc.clientlibs/clientlib...: 57 KB unused (66%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.lufthansa.com/etc.clientlibs/clientlib...: unminified — 42 KB could be saved
Info::
Total unused JavaScript: 852 KB
852 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.lufthansa.com/etc/designs/dcep/clientlib-all/vite/js/2d7ed8d4.chunk.js345 KB167 KB (49%)✓1st
https://www.lufthansa.com/etc/designs/dcep/clientlib-all/vite/js/cd23e20a.chunk.js167 KB150 KB (90%)✓1st
https://www.lufthansa.com/etc/designs/dcep/clientlib-all/vite/js/d77d313a.chunk.js263 KB134 KB (51%)✓1st
https://www.lufthansa.com/etc/designs/dcep/clientlib-all/vite/js/cf6255a2.chunk.js118 KB76 KB (65%)✓1st
https://www.lufthansa.com/etc.clientlibs/clientlibs/granite/jquery.1fc733054ddb2e2fcd4a0f763671047b.js87 KB57 KB (66%)✗1st
https://www.lufthansa.com/etc/designs/dcep/clientlib-all/vite/js/d10bccbc.chunk.js52 KB45 KB (86%)✓1st
https://www.lufthansa.com/etc/designs/dcep/clientlib-all/vite/js/63ac1397.chunk.js75 KB45 KB (61%)✓1st
https://www.lufthansa.com/digitalhangar/design-system/releases/v1.26.2/standalone/packages/maui-design-system.js308 KB42 KB (14%)✗1st
https://tags.tiqcdn.com/utag/lufthansa/main/prod/utag.js120 KB39 KB (34%)✓3rd
https://www.lufthansa.com/etc/designs/dcep/clientlib-all/vite/js/9792a05f.chunk.js66 KB34 KB (51%)✓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

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

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

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

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

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: private, max-age=0, no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

private, max-age=0, no-store, no-cache, must-revalidate, post-check=0, pre-check=0

DirectiveValueMeaning
private—Only browser cache, not CDN/proxy
max-age0Cache for 0 seconds
no-store—Never cache this response
no-cache—Cache but always revalidate first
must-revalidate—Must recheck with server after expiry
post-check0
pre-check0
C
Image Optimization
Action
38 images, 0 KB saveable
REVIEW
38 images, 0 KB saveable
Warning::
https://www.lufthansa.com/content/dam/lh/images/pi... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.lufthansa.com/content/dam/lh/images/lo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.lufthansa.com/content/dam/lh/images/lo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.lufthansa.com/content/dam/lh/de/images... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.lufthansa.com/content/dam/lh/images/al... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.lufthansa.com/content/dam/lh/images/fr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
38 images 11.2 MB
0 oversized -0 KB
36 legacy format
6 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

A
Third-Party Impact
34% third-party, 0 ms blocking
PASS
34% third-party, 0 ms blocking
Info::
Third-party code accounts for 34% of page weight (7.3 MiB of 21.3 MiB)
Info::
Third-party blocking time is low (0 ms)
66%
34%
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
22 fonts (1339 KB)
PASS
22 fonts (1339 KB)
Info::
22 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

22

1339 KB total

Render-blocking

0

of 22

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s 30.0 s 32.0 s 34.0 s 36.0 s 38.0 s 40.0 s 42.0 s 44.0 s 46.0 s 48.0 s 50.0 s 52.0 s 54.0 s 56.0 s 58.0 s 60.0 s 62.0 s 64.0 s 66.0 s 68.0 s 70.0 s 72.0 s 74.0 s 76.0 s FCP 9.8 s LCP 73.3 shttps://www.lufthansa.com/digitalhangar/design-system/releases/v1.26.2/standalone/fonts/lufthansa/LufthansaTextWeb-Bold.woffLufthansaTextWeb-Bold.woff https://www.lufthansa.com/digitalhangar/design-system/releases/v1.26.2/standalone/fonts/lufthansa/LufthansaTextWeb-Bold.woff — 63.0 KiB — 0 ms — font-display: swaphttps://www.lufthansa.com/digitalhangar/design-system/releases/v1.26.2/standalone/fonts/lufthansa/LufthansaHeadWeb-Light.woffLufthansaHeadWeb-Light.... https://www.lufthansa.com/digitalhangar/design-system/releases/v1.26.2/standalone/fonts/lufthansa/LufthansaHeadWeb-Light.woff — 61.9 KiB — 0 ms — font-display: swaphttps://www.lufthansa.com/etc/designs/dcep/clientlib-all/vite/fonts/lh-iconfont2.woff2lh-iconfont2.woff2 https://www.lufthansa.com/etc/designs/dcep/clientlib-all/vite/fonts/lh-iconfont2.woff2 — 55.7 KiB — 0 ms — font-display: swaphttps://www.lufthansa.com/digitalhangar/design-system/releases/v1.26.2/standalone/fonts/lufthansa/LufthansaTextWeb-Regular.woffLufthansaTextWeb-Regula... https://www.lufthansa.com/digitalhangar/design-system/releases/v1.26.2/standalone/fonts/lufthansa/LufthansaTextWeb-Regular.woff — 62.9 KiB — 0 ms — font-display: swaphttps://www.lufthansa.com/digitalhangar/design-system/releases/v1.26.2/standalone/fonts/lufthansa/LufthansaTextWeb-Light.woffLufthansaTextWeb-Light.... https://www.lufthansa.com/digitalhangar/design-system/releases/v1.26.2/standalone/fonts/lufthansa/LufthansaTextWeb-Light.woff — 59.8 KiB — 0 ms — font-display: swaphttps://www.lufthansa.com/digitalhangar/design-system/releases/v1.26.2/standalone/fonts/lufthansa/LufthansaHeadWeb-Bold.woffLufthansaHeadWeb-Bold.woff https://www.lufthansa.com/digitalhangar/design-system/releases/v1.26.2/standalone/fonts/lufthansa/LufthansaHeadWeb-Bold.woff — 62.7 KiB — 0 ms — font-display: swaphttps://shop.lufthansa.com/statics/applications/booking/dist/28.4.0/Icons-v2.6bfc7ccc3fd169de.woffIcons-v2.6bfc7ccc3fd169... https://shop.lufthansa.com/statics/applications/booking/dist/28.4.0/Icons-v2.6bfc7ccc3fd169de.woff — 167.2 KiB — 0 ms — font-display: swaphttps://shop.lufthansa.com/statics/applications/booking/dist/28.4.0/LH-DeSy-icons.09f874fee6224669.woffLH-DeSy-icons.09f874fee... https://shop.lufthansa.com/statics/applications/booking/dist/28.4.0/LH-DeSy-icons.09f874fee6224669.woff — 3.9 KiB — 0 ms — font-display: swaphttps://shop.lufthansa.com/statics/applications/booking/dist/28.4.0/LH-DeSy-icons.b968ff8ef1e6f1f2.ttfLH-DeSy-icons.b968ff8ef... https://shop.lufthansa.com/statics/applications/booking/dist/28.4.0/LH-DeSy-icons.b968ff8ef1e6f1f2.ttf — 2.4 KiB — 0 ms — font-display: swaphttps://shop.lufthansa.com/statics/applications/booking/dist/28.4.0/LH-icons.48706107136af9fc.ttfLH-icons.48706107136af9... https://shop.lufthansa.com/statics/applications/booking/dist/28.4.0/LH-icons.48706107136af9fc.ttf — 32.2 KiB — 0 ms — font-display: swaphttps://shop.lufthansa.com/statics/applications/booking/dist/28.4.0/LH-icons.942c714ae754d5b7.woffLH-icons.942c714ae754d5... https://shop.lufthansa.com/statics/applications/booking/dist/28.4.0/LH-icons.942c714ae754d5b7.woff — 59.6 KiB — 0 ms — font-display: swaphttps://shop.lufthansa.com/statics/applications/booking/dist/28.4.0/LufthansaHead-Bold.d494bc77ccad8817.otfLufthansaHead-Bold.d494... https://shop.lufthansa.com/statics/applications/booking/dist/28.4.0/LufthansaHead-Bold.d494bc77ccad8817.otf — 67.4 KiB — 0 ms — font-display: swaphttps://shop.lufthansa.com/statics/applications/booking/dist/28.4.0/LufthansaHead-Light.a53274dd356d4cc9.otfLufthansaHead-Light.a53... https://shop.lufthansa.com/statics/applications/booking/dist/28.4.0/LufthansaHead-Light.a53274dd356d4cc9.otf — 65.3 KiB — 0 ms — font-display: swaphttps://shop.lufthansa.com/statics/applications/booking/dist/28.4.0/LufthansaHead-Thin.d14961409b5cea4f.otfLufthansaHead-Thin.d149... https://shop.lufthansa.com/statics/applications/booking/dist/28.4.0/LufthansaHead-Thin.d14961409b5cea4f.otf — 63.4 KiB — 0 ms — font-display: swaphttps://shop.lufthansa.com/statics/applications/booking/dist/28.4.0/LufthansaHeadWeb-Bold.4aeff93423a0b2ee.woffLufthansaHeadWeb-Bold.4... https://shop.lufthansa.com/statics/applications/booking/dist/28.4.0/LufthansaHeadWeb-Bold.4aeff93423a0b2ee.woff — 62.9 KiB — 0 ms — font-display: swaphttps://shop.lufthansa.com/statics/applications/booking/dist/28.4.0/LufthansaHeadWeb-Light.c4e996794c6d83d9.woffLufthansaHeadWeb-Light.... https://shop.lufthansa.com/statics/applications/booking/dist/28.4.0/LufthansaHeadWeb-Light.c4e996794c6d83d9.woff — 61.3 KiB — 0 ms — font-display: swaphttps://shop.lufthansa.com/statics/applications/booking/dist/28.4.0/LufthansaText-Bold.de76b132ffbc231b.otfLufthansaText-Bold.de76... https://shop.lufthansa.com/statics/applications/booking/dist/28.4.0/LufthansaText-Bold.de76b132ffbc231b.otf — 68.8 KiB — 0 ms — font-display: swaphttps://shop.lufthansa.com/statics/applications/booking/dist/28.4.0/LufthansaText-Light.a3b2991e0c1bc90a.otfLufthansaText-Light.a3b... https://shop.lufthansa.com/statics/applications/booking/dist/28.4.0/LufthansaText-Light.a3b2991e0c1bc90a.otf — 64.5 KiB — 0 ms — font-display: swaphttps://shop.lufthansa.com/statics/applications/booking/dist/28.4.0/LufthansaText-Regular.0008d1ad52bcc6c8.otfLufthansaText-Regular.0... https://shop.lufthansa.com/statics/applications/booking/dist/28.4.0/LufthansaText-Regular.0008d1ad52bcc6c8.otf — 68.3 KiB — 0 ms — font-display: swaphttps://shop.lufthansa.com/statics/applications/booking/dist/28.4.0/LufthansaTextWeb-Bold.a04b0cc4b96ca9f3.woffLufthansaTextWeb-Bold.a... https://shop.lufthansa.com/statics/applications/booking/dist/28.4.0/LufthansaTextWeb-Bold.a04b0cc4b96ca9f3.woff — 63.1 KiB — 0 ms — font-display: swaphttps://shop.lufthansa.com/statics/applications/booking/dist/28.4.0/LufthansaTextWeb-Light.0e4cdd4decff9f3f.woffLufthansaTextWeb-Light.... https://shop.lufthansa.com/statics/applications/booking/dist/28.4.0/LufthansaTextWeb-Light.0e4cdd4decff9f3f.woff — 59.9 KiB — 0 ms — font-display: swaphttps://shop.lufthansa.com/statics/applications/booking/dist/28.4.0/LufthansaTextWeb-Regular.357dd11ec9c03e94.woffLufthansaTextWeb-Regula... https://shop.lufthansa.com/statics/applications/booking/dist/28.4.0/LufthansaTextWeb-Regular.357dd11ec9c03e94.woff — 63.1 KiB — 0 ms — font-display: swap
LufthansaTextWeb-Bold.woff woff swap
Size 63 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
LufthansaHeadWeb-Light.... woff swap
Size 62 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
lh-iconfont2.woff2 woff2 swap
Size 56 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
LufthansaTextWeb-Regula... woff swap
Size 63 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
LufthansaTextWeb-Light.... woff swap
Size 60 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
LufthansaHeadWeb-Bold.woff woff swap
Size 63 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Icons-v2.6bfc7ccc3fd169... woff swap
Size 167 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
LH-DeSy-icons.09f874fee... woff swap
Size 4 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
LH-DeSy-icons.b968ff8ef... ttf swap
Size 2 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
LH-icons.48706107136af9... ttf swap
Size 32 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
LH-icons.942c714ae754d5... woff swap
Size 60 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
LufthansaHead-Bold.d494... otf swap
Size 67 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
LufthansaHead-Light.a53... otf swap
Size 65 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
LufthansaHead-Thin.d149... otf swap
Size 63 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
LufthansaHeadWeb-Bold.4... woff swap
Size 63 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
LufthansaHeadWeb-Light.... woff swap
Size 61 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
LufthansaText-Bold.de76... otf swap
Size 69 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
LufthansaText-Light.a3b... otf swap
Size 64 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
LufthansaText-Regular.0... otf swap
Size 68 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
LufthansaTextWeb-Bold.a... woff swap
Size 63 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
LufthansaTextWeb-Light.... woff swap
Size 60 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
LufthansaTextWeb-Regula... woff swap
Size 63 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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)

Fixing the unchecked items could save ~469 KB and ~938 ms

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
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
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
514 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
24% of JavaScript execution is third-party
First-party Third-party 4417ms · 136KB · €48/mo
Unattributable
Other
Costly
Execution 3318ms
Transfer 0 KB
Monthly Cost €36/mo
shop.lufthansa.com
Other
Costly
Execution 850ms
Transfer 16 KB
Monthly Cost €9/mo
tags.tiqcdn.com
Other
Costly
Execution 249ms
Transfer 120 KB
Unused 34%
Monthly Cost €3/mo

These scripts may cost more than they're worth

  • Unattributable adds 3318ms and costs ~€36/month
  • shop.lufthansa.com adds 850ms and costs ~€9/month
  • tags.tiqcdn.com adds 249ms and costs ~€3/month

Unattributable takes 3318ms 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

shop.lufthansa.com takes 850ms 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

tags.tiqcdn.com takes 249ms 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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