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Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
76
GRADE
C
FIX
5
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
52
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
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.

4.95 s

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

13.56 s

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

322 ms

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.

6.86 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.

13.69 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 2 REVIEW 5 FIX
F
Page Weight Budget
Action
4.1 MB transferred, 106 requests
FIX
4.1 MB transferred, 106 requests
Critical::
Page weighs 8.3 MB (4.1 MB transferred)
Warning::
JavaScript is 873 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 873 KB
Info::
Fonts are 281 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 281 KB
Warning::
106 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.86 g CO2 per page load
4.1 MB / 2.4 MB budget
4.1 MB transferred
106 requests
0.86 g CO2 per page load
Other 2.1 MiB 51%
JavaScript 873.3 KiB 21%
Images 734.3 KiB 18%
Fonts 281.3 KiB 7%
CSS 77.0 KiB 2%
Other 60.5 KiB 1%
HTML 37.0 KiB 1%
Other 8.6 KiB 0%
Other 1.1 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 (4.1 MiB of 4.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2993ms total JS execution
FIX
2993ms total JS execution
Warning::
Unattributable: 595ms CPU time
Warning::
https://snyk.io/: 579ms CPU time
Warning::
https://snyk.io/_next/static/chunks/7909-3e366bfa7...: 447ms CPU time
Warning::
https://snyk.io/_next/static/chunks/framework-2ec7...: 270ms CPU time
Info::
https://www.googletagmanager.com/gtag/destination?...: 230ms CPU time
Warning::
Third-party scripts: 2993ms (100% of total)

Main Thread Breakdown

Script Evaluation 41% Other 28% Style & Layout 15% Script Parsing & Compilation 8% Rendering 4%
ScriptTotalScriptingParse/CompileParty
Unattributable595ms49ms0ms3rd
https://snyk.io/579ms15ms2ms3rd
https://snyk.io/_next/static/chunks/7909-3e366bfa7531aa22.js447ms72ms3ms3rd
https://snyk.io/_next/static/chunks/framework-2ec761b5af9ac788.js270ms249ms13ms3rd
https://www.googletagmanager.com/gtag/destination?id=G-X9SH3KP7B4&cx=c&gtm=4e6460230ms190ms37ms3rd
https://web.cmp.usercentrics.eu/ui/v/3.111.0/WebSdk.lib.f9924d53.js159ms110ms44ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-T8QMQW9142ms105ms31ms3rd
https://snyk.io/_next/static/chunks/main-adfdb9879c87958c.js127ms113ms10ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-W4LKKNL&gtm=4e6460115ms76ms36ms3rd
https://web.cmp.usercentrics.eu/ui/v/3.111.0/UcGdprCmpView.c071ab9b.js108ms36ms11ms3rd

Showing top 10 of 13 scripts

D
JS Bundles
Action
48 scripts, 282 KB unused
FIX
48 scripts, 282 KB unused
Warning::
https://www.googletagmanager.com/gtag/destination?...: 69 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-W4L...: 68 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-T8Q...: 59 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://web.cmp.usercentrics.eu/ui/v/3.111.0/WebSd...: 43 KB unused (59%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://web.cmp.usercentrics.eu/ui/v/3.111.0/WebSd...: unminified — 23 KB could be saved
Warning::
https://snyk.io/_next/static/chunks/framework-2ec7...: 22 KB unused (37%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 282 KB
282 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/destination?id=G-X9SH3KP7B4&cx=c&gtm=4e6460163 KB69 KB (42%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-W4LKKNL&gtm=4e6460148 KB68 KB (46%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-T8QMQW9123 KB59 KB (48%)✓3rd
https://web.cmp.usercentrics.eu/ui/v/3.111.0/WebSdk.lib.f9924d53.js73 KB43 KB (59%)✗3rd
https://snyk.io/_next/static/chunks/framework-2ec761b5af9ac788.js59 KB22 KB (37%)✓3rd
https://web.cmp.usercentrics.eu/ui/TvGdprCmpView.b6de9c89.js35 KB20 KB (57%)✗3rd
https://snyk.io/_next/static/N-3GFnt18F4AK4LxgR28g/_buildManifest.js2 KB—✓3rd
https://web.cmp.usercentrics.eu/ui/loader.js20 KB—✗3rd
https://snyk.io/_next/static/chunks/5598.e31fdf195aafc243.js1 KB—✓3rd
https://snyk.io/_next/static/chunks/2741.eb3975a2d03fe4ad.js2 KB—✓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

F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

B
Image Optimization
21 images, 0 KB saveable
REVIEW
21 images, 0 KB saveable
Info::
All images are well-optimized
21 images 734 KB
0 oversized -0 KB
12 legacy format
0 missing dimensions CLS risk
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

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
8 fonts (281 KB)
PASS
8 fonts (281 KB)
Info::
8 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

8

281 KB total

Render-blocking

0

of 8

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 FCP 5.0 s LCP 13.6 shttps://snyk.io/_next/static/media/fb407b189f36a608.p.woff2fb407b189f36a608.p.woff2 https://snyk.io/_next/static/media/fb407b189f36a608.p.woff2 — 57.3 KiB — 0 ms — font-display: swaphttps://snyk.io/_next/static/media/36966cca54120369-s.p.woff236966cca54120369-s.p.woff2 https://snyk.io/_next/static/media/36966cca54120369-s.p.woff2 — 22.2 KiB — 0 ms — font-display: swaphttps://snyk.io/_next/static/media/02743a8d10a3d186-s.p.woff202743a8d10a3d186-s.p.woff2 https://snyk.io/_next/static/media/02743a8d10a3d186-s.p.woff2 — 41.2 KiB — 0 ms — font-display: swaphttps://snyk.io/_next/static/media/1e41be92c43b3255-s.p.woff21e41be92c43b3255-s.p.woff2 https://snyk.io/_next/static/media/1e41be92c43b3255-s.p.woff2 — 37.0 KiB — 0 ms — font-display: swaphttps://snyk.io/_next/static/media/739c2d8941231bb4-s.p.woff2739c2d8941231bb4-s.p.woff2 https://snyk.io/_next/static/media/739c2d8941231bb4-s.p.woff2 — 32.4 KiB — 0 ms — font-display: swaphttps://snyk.io/_next/static/media/4cf2300e9c8272f7-s.p.woff24cf2300e9c8272f7-s.p.woff2 https://snyk.io/_next/static/media/4cf2300e9c8272f7-s.p.woff2 — 28.1 KiB — 0 ms — font-display: swaphttps://snyk.io/_next/static/media/93f479601ee12b01-s.p.woff293f479601ee12b01-s.p.woff2 https://snyk.io/_next/static/media/93f479601ee12b01-s.p.woff2 — 31.0 KiB — 0 ms — font-display: swaphttps://res.cloudinary.com/snyk/raw/upload/snyk-mktg-brandui/icons-font/v1.0.13/brandui-icons.ttfbrandui-icons.ttf https://res.cloudinary.com/snyk/raw/upload/snyk-mktg-brandui/icons-font/v1.0.13/brandui-icons.ttf — 32.1 KiB — 0 ms — font-display: swap
fb407b189f36a608.p.woff2 woff2 swap
Size 57 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
36966cca54120369-s.p.woff2 woff2 swap
Size 22 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
02743a8d10a3d186-s.p.woff2 woff2 swap
Size 41 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
1e41be92c43b3255-s.p.woff2 woff2 swap
Size 37 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
739c2d8941231bb4-s.p.woff2 woff2 swap
Size 32 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
4cf2300e9c8272f7-s.p.woff2 woff2 swap
Size 28 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
93f479601ee12b01-s.p.woff2 woff2 swap
Size 31 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
brandui-icons.ttf 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
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 ~10 KB and ~20 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
13 hints, 0 missing preconnects
PASS
13 hints, 0 missing preconnects
Info::
Page uses 13 resource hint(s)

Current Resource Hints

preconnect
—
preload
+1
11
dns-prefetch
—
prefetch
2

13 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
106 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 2993ms · 773KB · £44/mo
Unattributable
Other
Costly
Execution 595ms
Transfer 0 KB
Monthly Cost £9/mo
snyk.io
Other
Costly
Execution 579ms
Transfer 36 KB
Monthly Cost £9/mo
snyk.io
Other
Costly
Execution 447ms
Transfer 12 KB
Monthly Cost £7/mo
snyk.io
Other
Costly
Execution 270ms
Transfer 59 KB
Unused 37%
Monthly Cost £4/mo
Google Tag Manager
Tag Manager
Costly
Execution 230ms
Transfer 163 KB
Unused 42%
Monthly Cost £3/mo
web.cmp.usercentrics.eu
Other
Optional
Execution 159ms
Transfer 73 KB
Unused 59%
Monthly Cost £2/mo
Google Tag Manager
Tag Manager
Optional
Execution 142ms
Transfer 123 KB
Unused 48%
Monthly Cost £2/mo
snyk.io
Other
Optional
Execution 127ms
Transfer 39 KB
Monthly Cost £2/mo
Google Tag Manager
Tag Manager
Optional
Execution 115ms
Transfer 148 KB
Unused 46%
Monthly Cost £2/mo
web.cmp.usercentrics.eu
Other
Optional
Execution 108ms
Transfer 21 KB
Monthly Cost £2/mo
j.6sc.co
Other
Optional
Execution 100ms
Transfer 19 KB
Monthly Cost £1/mo
snyk.io
Other
Optional
Execution 64ms
Transfer 77 KB
Monthly Cost £1/mo
snyk.io
Other
Optional
Execution 58ms
Transfer 3 KB
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • Unattributable adds 595ms and costs ~£9/month
  • snyk.io adds 579ms and costs ~£9/month
  • snyk.io adds 447ms and costs ~£7/month
  • snyk.io adds 270ms and costs ~£4/month
  • Google Tag Manager adds 230ms and costs ~£3/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

Unattributable takes 595ms 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

snyk.io takes 579ms 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

snyk.io takes 447ms 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

snyk.io takes 270ms 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 230ms 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 web.cmp.usercentrics.eu'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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