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Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
4
REVIEW
2
PASS
8
INFO
2

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

Mobile Desktop
33
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.

2.86 s

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

12.59 s

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

2.41 s

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

0.004

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

10.90 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.

26.60 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
16
8 PASS 2 REVIEW 4 FIX
F
Page Weight Budget
Action
35.0 MB transferred, 318 requests
FIX
35.0 MB transferred, 318 requests
Critical::
Page weighs 49.4 MB (35.0 MB transferred)
Warning::
JavaScript is 2.4 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.4 MB
Info::
Fonts are 229 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 229 KB
Warning::
318 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 7.3 g CO2 per page load
35.0 MB / 2.4 MB budget
35.0 MB transferred
318 requests
7.3 g CO2 per page load
Other 31.3 MiB 90%
JavaScript 2.4 MiB 7%
Images 743.1 KiB 2%
Fonts 228.6 KiB 1%
HTML 133.5 KiB 0%
Other 124.2 KiB 0%
CSS 32.8 KiB 0%
Other 9.8 KiB 0%
Other 1.7 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

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

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (35.0 MiB of 35.0 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
14794ms total JS execution
FIX
14794ms total JS execution
Warning::
https://www.airtime.com/_next/static/chunks/43463b...: 5949ms CPU time
Warning::
https://www.airtime.com/_next/static/chunks/7a4960...: 3490ms CPU time
Warning::
https://www.airtime.com/_next/static/chunks/27c919...: 2669ms CPU time
Warning::
Unattributable: 1151ms CPU time
Warning::
https://www.airtime.com/home: 625ms CPU time
Warning::
Third-party scripts: 14794ms (100% of total)

Main Thread Breakdown

Script Evaluation 65% Other 14% Style & Layout 10% Parse HTML & CSS 5% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
https://www.airtime.com/_next/static/chunks/43463b79ce561e2b.js?dpl=dpl_5G8oz5rwsBXRNAVwaUZ4BNqQYBp65949ms4327ms31ms3rd
https://www.airtime.com/_next/static/chunks/7a49606dc85869d0.js?dpl=dpl_5G8oz5rwsBXRNAVwaUZ4BNqQYBp63490ms2254ms129ms3rd
https://www.airtime.com/_next/static/chunks/27c9195b51d29285.js?dpl=dpl_5G8oz5rwsBXRNAVwaUZ4BNqQYBp62669ms2324ms48ms3rd
Unattributable1151ms56ms0ms3rd
https://www.airtime.com/home625ms40ms35ms3rd
https://www.airtime.com/_next/static/chunks/b530c7326bcd9c63.js?dpl=dpl_5G8oz5rwsBXRNAVwaUZ4BNqQYBp6275ms272ms2ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MP2L82G263ms214ms46ms3rd
https://www.airtime.com/_next/static/chunks/cba8986258977648.js?dpl=dpl_5G8oz5rwsBXRNAVwaUZ4BNqQYBp6229ms178ms49ms3rd
https://www.airtime.com/_next/static/chunks/42964fd9a84fd3a3.js?dpl=dpl_5G8oz5rwsBXRNAVwaUZ4BNqQYBp6144ms82ms14ms3rd
F
JS Bundles
Action
111 scripts, 682 KB unused
FIX
111 scripts, 682 KB unused
Warning::
https://www.airtime.com/_next/static/chunks/c6a6e0...: 124 KB unused (96%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.airtime.com/_next/static/chunks/7a4960...: 117 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.airtime.com/_next/static/chunks/149a97...: 100 KB unused (98%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-MP2...: 73 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.airtime.com/_next/static/chunks/cba898...: 70 KB unused (78%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 682 KB
682 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.airtime.com/_next/static/chunks/c6a6e08733ea3a55.js?dpl=dpl_5G8oz5rwsBXRNAVwaUZ4BNqQYBp6130 KB124 KB (96%)✓3rd
https://www.airtime.com/_next/static/chunks/7a49606dc85869d0.js?dpl=dpl_5G8oz5rwsBXRNAVwaUZ4BNqQYBp6285 KB117 KB (41%)✓3rd
https://www.airtime.com/_next/static/chunks/149a97fb38f876d6.js?dpl=dpl_5G8oz5rwsBXRNAVwaUZ4BNqQYBp6102 KB100 KB (98%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MP2L82G165 KB73 KB (44%)✓3rd
https://www.airtime.com/_next/static/chunks/cba8986258977648.js?dpl=dpl_5G8oz5rwsBXRNAVwaUZ4BNqQYBp690 KB70 KB (78%)✓3rd
https://www.airtime.com/_next/static/chunks/de5d941d3b65f444.js?dpl=dpl_5G8oz5rwsBXRNAVwaUZ4BNqQYBp642 KB42 KB (100%)✓3rd
https://www.airtime.com/_next/static/chunks/113f98656ae342b2.js?dpl=dpl_5G8oz5rwsBXRNAVwaUZ4BNqQYBp678 KB41 KB (53%)✓3rd
https://www.airtime.com/_next/static/chunks/43463b79ce561e2b.js?dpl=dpl_5G8oz5rwsBXRNAVwaUZ4BNqQYBp661 KB36 KB (59%)✓3rd
https://www.airtime.com/_next/static/chunks/4bc978b987ec3de9.js?dpl=dpl_5G8oz5rwsBXRNAVwaUZ4BNqQYBp648 KB34 KB (71%)✓3rd
https://www.airtime.com/_next/static/chunks/f66909e545e28188.js?dpl=dpl_5G8oz5rwsBXRNAVwaUZ4BNqQYBp639 KB23 KB (59%)✓3rd

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

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

Green Hosting

No green hosting detected

B
HTTP Caching
public, max-age=0, must-revalidate
REVIEW
public, max-age=0, must-revalidate
Info::
Cache-Control header is set
Got: public, max-age=0, must-revalidate
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

public, max-age=0, must-revalidate

DirectiveValueMeaning
public—Any cache may store this response
max-age0Cache for 0 seconds
must-revalidate—Must recheck with server after expiry
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
31 images, 0 KB saveable
PASS
31 images, 0 KB saveable
Info::
All images are well-optimized
31 images 743 KB
0 oversized -0 KB
1 legacy format
0 missing dimensions CLS risk
A+
Font Loading
6 fonts (229 KB)
PASS
6 fonts (229 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

229 KB total

Render-blocking

0

of 6

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 FCP 2.9 s LCP 12.6 shttps://www.airtime.com/_next/static/media/36363bfb06833f56-s.p.d8302362.woff236363bfb06833f56-s.p.d8... https://www.airtime.com/_next/static/media/36363bfb06833f56-s.p.d8302362.woff2 — 8.7 KiB — 0 ms — font-display: swaphttps://www.airtime.com/_next/static/media/Neue_Haas_Grotesk_Display_Pro_55_Roman-s.p.51706db8.woff2Neue_Haas_Grotesk_Displ... https://www.airtime.com/_next/static/media/Neue_Haas_Grotesk_Display_Pro_55_Roman-s.p.51706db8.woff2 — 40.3 KiB — 0 ms — font-display: swaphttps://www.airtime.com/_next/static/media/Neue_Haas_Grotesk_Display_Pro_55_Roman_Italic-s.p.943887f9.woff2Neue_Haas_Grotesk_Displ... https://www.airtime.com/_next/static/media/Neue_Haas_Grotesk_Display_Pro_55_Roman_Italic-s.p.943887f9.woff2 — 44.5 KiB — 0 ms — font-display: swaphttps://www.airtime.com/_next/static/media/Neue_Haas_Grotesk_Display_Pro_65_Medium-s.p.7e273ed3.woff2Neue_Haas_Grotesk_Displ... https://www.airtime.com/_next/static/media/Neue_Haas_Grotesk_Display_Pro_65_Medium-s.p.7e273ed3.woff2 — 42.3 KiB — 0 ms — font-display: swaphttps://www.airtime.com/_next/static/media/Neue_Haas_Grotesk_Display_Pro_75_Bold-s.p.3c5166ca.woff2Neue_Haas_Grotesk_Displ... https://www.airtime.com/_next/static/media/Neue_Haas_Grotesk_Display_Pro_75_Bold-s.p.3c5166ca.woff2 — 44.5 KiB — 0 ms — font-display: swaphttps://www.airtime.com/_next/static/media/Neue_Haas_Grotesk_Display_Pro_75_Bold_Italic-s.p.fe4a253c.woff2Neue_Haas_Grotesk_Displ... https://www.airtime.com/_next/static/media/Neue_Haas_Grotesk_Display_Pro_75_Bold_Italic-s.p.fe4a253c.woff2 — 48.2 KiB — 0 ms — font-display: swap
36363bfb06833f56-s.p.d8... woff2 swap
Size 9 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Neue_Haas_Grotesk_Displ... woff2 swap
Size 40 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Neue_Haas_Grotesk_Displ... woff2 swap
Size 44 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Neue_Haas_Grotesk_Displ... woff2 swap
Size 42 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Neue_Haas_Grotesk_Displ... woff2 swap
Size 45 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Neue_Haas_Grotesk_Displ... woff2 swap
Size 48 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
11 hints, 0 missing preconnects
PASS
11 hints, 0 missing preconnects
Info::
Page uses 11 resource hint(s)

Current Resource Hints

preconnect
3
preload
8
dns-prefetch
—
prefetch
—

11 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
318 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
100% of JavaScript execution is third-party
First-party Third-party 14794ms · 755KB · €161/mo
www.airtime.com
Other
Costly
Execution 5949ms
Transfer 61 KB
Unused 59%
Monthly Cost €65/mo
www.airtime.com
Other
Costly
Execution 3490ms
Transfer 285 KB
Unused 41%
Monthly Cost €38/mo
www.airtime.com
Other
Costly
Execution 2669ms
Transfer 64 KB
Monthly Cost €29/mo
Unattributable
Other
Costly
Execution 1151ms
Transfer 0 KB
Monthly Cost €12/mo
www.airtime.com
Other
Costly
Execution 625ms
Transfer 53 KB
Monthly Cost €7/mo
www.airtime.com
Other
Costly
Execution 275ms
Transfer 9 KB
Monthly Cost €3/mo
Google Tag Manager
Tag Manager
Costly
Execution 263ms
Transfer 165 KB
Unused 44%
Monthly Cost €3/mo
www.airtime.com
Other
Costly
Execution 229ms
Transfer 90 KB
Unused 78%
Monthly Cost €2/mo
www.airtime.com
Other
Optional
Execution 144ms
Transfer 30 KB
Monthly Cost €2/mo

These scripts may cost more than they're worth

  • www.airtime.com adds 5949ms and costs ~€65/month
  • www.airtime.com adds 3490ms and costs ~€38/month
  • www.airtime.com adds 2669ms and costs ~€29/month
  • Unattributable adds 1151ms and costs ~€12/month
  • www.airtime.com adds 625ms and costs ~€7/month
  • www.airtime.com adds 275ms and costs ~€3/month
  • Google Tag Manager adds 263ms and costs ~€3/month
  • www.airtime.com adds 229ms and costs ~€2/month

100% 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

www.airtime.com takes 5949ms 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

59% of www.airtime.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

www.airtime.com takes 3490ms 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

www.airtime.com takes 2669ms 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 1151ms 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

www.airtime.com takes 625ms 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

www.airtime.com takes 275ms 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

Google Tag Manager takes 263ms 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

www.airtime.com takes 229ms 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

78% of www.airtime.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

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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