Performance
· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
1.20 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.80 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
258 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.029
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
2.00 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.
2.64 s
Page Load Progression
FPage Weight BudgetAction5.9 MB transferred, 68 requestsFIX
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
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.
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.
Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).
Source: web.dev font loading
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DJS Execution CostAction2507ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.airbus.com/sites/g/files/jlcbta136/files/js/js__5I_Qda8cZx7qnQ4NQZn4jrfV8mW1Qtb3KcMW3WnAEY.js?scope=footer&delta=0&language=en&theme=airbus_web_experience_ui&include=eJyNkdFuwyAMRX8oMp9kEeISrxSYbZL170fUZiqrJu3FOj738mDhWeamWHnnK66UKonz7256OrUSrliFA7l3dbZ2mpG--jOmHAgbu5jK7NPf-cYLlSmkLkw74-YTL964ZPz4bCR3FzZ4EPCF_lt9ZjQ1xurNSLK64GWBY_y2pSklOGFMV65wjNGWeheOq8EPDfmFYxNCNrrBCw-dG-UGxxgtq_aLFE4Y0uoj9Z_xCwm88NDRICUlnJtZyTBsQ89KjIlQd7awwrB9A6mc190 | 895ms | 288ms | 37ms | 3rd |
| https://airbus.containers.piwik.pro/6e94a634-7809-40d1-abf3-93c937d98aa3.js | 536ms | 374ms | 143ms | 3rd |
| https://www.airbus.com/en | 445ms | 23ms | 1ms | 3rd |
| Unattributable | 370ms | 10ms | 0ms | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202601.1.0/otBannerSdk.js | 187ms | 103ms | 33ms | 3rd |
| https://eu.posthog.com/static/array.js | 74ms | 66ms | 7ms | 3rd |
DJS BundlesAction12 scripts, 336 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.airbus.com/sites/g/files/jlcbta136/files/js/js__5I_Qda8cZx7qnQ4NQZn4jrfV8mW1Qtb3KcMW3WnAEY.js?scope=footer&delta=0&language=en&theme=airbus_web_experience_ui&include=eJyNkdFuwyAMRX8oMp9kEeISrxSYbZL170fUZiqrJu3FOj738mDhWeamWHnnK66UKonz7256OrUSrliFA7l3dbZ2mpG--jOmHAgbu5jK7NPf-cYLlSmkLkw74-YTL964ZPz4bCR3FzZ4EPCF_lt9ZjQ1xurNSLK64GWBY_y2pSklOGFMV65wjNGWeheOq8EPDfmFYxNCNrrBCw-dG-UGxxgtq_aLFE4Y0uoj9Z_xCwm88NDRICUlnJtZyTBsQ89KjIlQd7awwrB9A6mc190 | 254 KB | 173 KB (69%) | ✓ | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202601.1.0/otBannerSdk.js | 127 KB | 66 KB (52%) | ✓ | 3rd |
| https://airbus.containers.piwik.pro/6e94a634-7809-40d1-abf3-93c937d98aa3.js | 89 KB | 36 KB (41%) | ✓ | 3rd |
| https://eu.posthog.com/static/array.js | 67 KB | 35 KB (52%) | ✓ | 3rd |
| https://eu-assets.i.posthog.com/static/surveys.js?v=1.369.5 | 32 KB | 25 KB (78%) | ✓ | 3rd |
| https://cdn.cookielaw.org/consent/cba2a8e8-1c6b-4e6f-8527-4d25866eba06/OtAutoBlock.js | 3 KB | — | ✓ | 3rd |
| https://cdn.cookielaw.org/scripttemplates/otSDKStub.js | 9 KB | — | ✓ | 3rd |
| https://www.airbus.com/_Incapsula_Resource?SWJIYLWA=719d34d31c8e3a6e6fffd425f7e032f3&ns=26&cb=1506011858 | 19 KB | — | ✓ | 3rd |
| https://airbus.containers.piwik.pro/ppms.js | 26 KB | — | ✓ | 3rd |
| https://eu-assets.i.posthog.com/array/phc_OjEbyLPndPNczcUuYziKKoTQJu34ElCWZrGK4wWOKRm/config.js | 9 KB | — | ✓ | 3rd |
Consider code splitting or tree shaking to reduce unused code.
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.
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.
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.
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.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
DPage Weight InventoryAction68 resources · 5.9 MB · 336 KB savings availableFIX
~336.0 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 68 resources | 5.9 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization30 images, 0 KB saveableREVIEW
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
A+Font Loading3 fonts (565 KB)PASS
Web fonts
3
565 KB total
Render-blocking
0
of 3
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
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 ~283 KB and ~566 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
Network Waterfall68 requests over 2487msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.airbus.com www.airbus.com | Other | 895ms | 254 KB | 69% | $12/mo | Costly |
airbus.containers.piwik.pro airbus.containers.piwik.pro | Other | 536ms | 89 KB | 41% | $7/mo | Costly |
www.airbus.com www.airbus.com | Other | 445ms | 44 KB | — | $6/mo | Costly |
Unattributable Unattributable | Other | 370ms | 0 KB | — | $5/mo | Costly |
OneTrust cdn.cookielaw.org | Consent | 187ms | 127 KB | 52% | $2/mo | Essential |
eu.posthog.com eu.posthog.com | Other | 74ms | 67 KB | 52% | $1/mo | Optional |
These scripts may cost more than they're worth
- www.airbus.com adds 895ms and costs ~$12/month
- airbus.containers.piwik.pro adds 536ms and costs ~$7/month
- www.airbus.com adds 445ms and costs ~$6/month
- Unattributable adds 370ms and costs ~$5/month
100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.
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
www.airbus.com takes 895ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
69% of www.airbus.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
airbus.containers.piwik.pro takes 536ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
www.airbus.com takes 445ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Unattributable takes 370ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
52% of OneTrust's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
52% of eu.posthog.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev