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https://www.storyblok.com

Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
82
GRADE
B
FIX
2
REVIEW
5
PASS
7
INFO
2

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

Mobile Desktop
51
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.
92
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.

2.38 s

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

6.17 s

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

1.18 s

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

0.000

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

2.92 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.

9.56 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
7 PASS 5 REVIEW 2 FIX
D
Third-Party Impact
Action
64% third-party, 0 ms blocking
FIX
64% third-party, 0 ms blocking
Warning::
Third-party code accounts for 64% of page weight (715.5 KiB of 1.1 MiB)
Info::
Third-party blocking time is low (0 ms)
36%
64%
First-party Third-party
F
JS Execution Cost
Action
5255ms total JS execution
FIX
5255ms total JS execution
Warning::
https://www.storyblok.com/: 2051ms CPU time
Warning::
Unattributable: 1166ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-HWTG...: 830ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-674...: 434ms CPU time
Warning::
https://www.storyblok.com/_astro/page.k449a2wJ.js: 352ms CPU time
Info::
Third-party scripts: 2619ms (50% of total)

Main Thread Breakdown

Other 31% Script Evaluation 30% Style & Layout 23% Rendering 7% Script Parsing & Compilation 5%
ScriptTotalScriptingParse/CompileParty
https://www.storyblok.com/2051ms67ms7ms1st
Unattributable1166ms154ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-HWTGCECK5C830ms371ms185ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-674753115&cx=c&gtm=4e6460434ms333ms59ms3rd
https://www.storyblok.com/_astro/page.k449a2wJ.js352ms324ms1ms1st
https://www.storyblok.com/_astro/tracking.B4FkHCOy.js232ms209ms0ms1st
https://eu.i.posthog.com/static/array.js128ms108ms19ms3rd
https://cdn.rudderlabs.com/3.30.0/modern/js-integrations/GA4.min.js61ms56ms3ms3rd
B
Page Weight Budget
1.1 MB transferred, 94 requests
REVIEW
1.1 MB transferred, 94 requests
Info::
Page weighs 3.7 MB (1.1 MB transferred)
Warning::
JavaScript is 525 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 525 KB
Info::
94 HTTP requests
Info::
Estimated 0.23 g CO2 per page load
1.1 MB / 2.4 MB budget
1.1 MB transferred
94 requests
0.23 g CO2 per page load
JavaScript 525.4 KiB 47%
Images 235.7 KiB 21%
Fonts 161.3 KiB 14%
CSS 68.8 KiB 6%
Other 64.5 KiB 6%
HTML 52.7 KiB 5%
Other 2.1 KiB 0%
Other 1.8 KiB 0%
Other 971 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Under 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

B
Image Optimization
37 images, 0 KB saveable
REVIEW
37 images, 0 KB saveable
Info::
All images are well-optimized
37 images 236 KB
0 oversized -0 KB
32 legacy format
0 missing dimensions CLS risk
C
JS Bundles
Action
30 scripts, 171 KB unused
REVIEW
30 scripts, 171 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-HWTG...: 66 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-674...: 60 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://eu.i.posthog.com/static/array.js: 45 KB unused (70%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 171 KB
171 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-HWTGCECK5C169 KB66 KB (39%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-674753115&cx=c&gtm=4e6460147 KB60 KB (41%)✓3rd
https://eu.i.posthog.com/static/array.js65 KB45 KB (70%)✓3rd
https://www.storyblok.com/_astro/exports.CuIIb5En.js13 KB—✓1st
https://www.storyblok.com/_astro/page.k449a2wJ.js37 KB—✓1st
https://www.storyblok.com/_astro/Base.astro_astro_type_script_index_0_lang.BfWP2xCS.js6 KB—✓1st
https://www.storyblok.com/_astro/ConsentNotice.astro_astro_type_script_index_0_lang.5VazJZjp.js2 KB—✓1st
https://www.storyblok.com/_astro/js.cookie.ZV3VVXDq.js2 KB—✓1st
https://www.storyblok.com/_astro/tracking.B4FkHCOy.js36 KB—✓1st
https://www.storyblok.com/_astro/websiteConfig.CdTN-17h.js2 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

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::
ETag present — enables conditional (304) responses
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+
Font Loading
4 fonts (161 KB)
PASS
4 fonts (161 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

161 KB total

Render-blocking

0

of 4

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 FCP 2.4 s LCP 6.2 shttps://www.storyblok.com/fonts/ABCMarfa-Bold.woff2ABCMarfa-Bold.woff2 https://www.storyblok.com/fonts/ABCMarfa-Bold.woff2 — 41.9 KiB — 0 ms — font-display: swaphttps://www.storyblok.com/fonts/ABCMarfa-Regular.woff2ABCMarfa-Regular.woff2 https://www.storyblok.com/fonts/ABCMarfa-Regular.woff2 — 37.6 KiB — 0 ms — font-display: swaphttps://www.storyblok.com/fonts/ABCMarfa-Black.woff2ABCMarfa-Black.woff2 https://www.storyblok.com/fonts/ABCMarfa-Black.woff2 — 40.3 KiB — 0 ms — font-display: swaphttps://www.storyblok.com/fonts/ABCMarfa-Medium.woff2ABCMarfa-Medium.woff2 https://www.storyblok.com/fonts/ABCMarfa-Medium.woff2 — 41.6 KiB — 0 ms — font-display: swap
ABCMarfa-Bold.woff2 woff2 swap
Size 42 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
ABCMarfa-Regular.woff2 woff2 swap
Size 38 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
ABCMarfa-Black.woff2 woff2 swap
Size 40 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
ABCMarfa-Medium.woff2 woff2 swap
Size 42 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
3 hints, 0 missing preconnects
PASS
3 hints, 0 missing preconnects
Info::
Page uses 3 resource hint(s)

Current Resource Hints

preconnect
3
preload
—
dns-prefetch
—
prefetch
—

3 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
94 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
50% of JavaScript execution is third-party
First-party Third-party 2619ms · 391KB · €28/mo
Unattributable
Other
Costly
Execution 1166ms
Transfer 0 KB
Monthly Cost €13/mo
Google Tag Manager
Tag Manager
Costly
Execution 830ms
Transfer 169 KB
Unused 39%
Monthly Cost €9/mo
Google Tag Manager
Tag Manager
Costly
Execution 434ms
Transfer 147 KB
Unused 41%
Monthly Cost €5/mo
eu.i.posthog.com
Other
Optional
Execution 128ms
Transfer 65 KB
Unused 70%
Monthly Cost €1/mo
cdn.rudderlabs.com
Other
Optional
Execution 61ms
Transfer 11 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Unattributable adds 1166ms and costs ~€13/month
  • Google Tag Manager adds 830ms and costs ~€9/month
  • Google Tag Manager adds 434ms and costs ~€5/month

50% 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

Unattributable takes 1166ms 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 830ms 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 434ms 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

70% of eu.i.posthog.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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