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Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
76
GRADE
C
FIX
4
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
93
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.

924 ms

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

1.55 s

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

0 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.

1.35 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.

1.56 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
14
5 PASS 3 REVIEW 4 FIX
F
Page Weight Budget
Action
4.9 MB transferred, 189 requests
FIX
4.9 MB transferred, 189 requests
Critical::
Page weighs 11.6 MB (4.9 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::
189 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.0 g CO2 per page load
4.9 MB / 2.4 MB budget
4.9 MB transferred
189 requests
1.0 g CO2 per page load
Other 2.1 MiB 42%
Images 993.4 KiB 20%
JavaScript 873.3 KiB 17%
Other 620.4 KiB 12%
Fonts 281.3 KiB 6%
CSS 77.0 KiB 2%
Other 53.9 KiB 1%
HTML 37.0 KiB 1%
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 (4.9 MiB of 4.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
74 scripts, 281 KB unused
FIX
74 scripts, 281 KB unused
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/gtag/destination?...: 68 KB unused (42%)
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: 281 KB
281 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-W4LKKNL&gtm=4e6460148 KB68 KB (46%)✓3rd
https://www.googletagmanager.com/gtag/destination?id=G-X9SH3KP7B4&cx=c&gtm=4e6460163 KB68 KB (42%)✓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/chunks/pages/events-32f3432d2cdcc1ff.js4 KB—✓3rd
https://snyk.io/_next/static/chunks/pages/blog-3e0fbd80f282f7b2.js5 KB—✓3rd
https://snyk.io/_next/static/chunks/9330.0c3e3f98be7493e4.js2 KB—✓3rd
https://snyk.io/_next/static/chunks/6660.7bc747208b05ddba.js3 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
35 images, 0 KB saveable
REVIEW
35 images, 0 KB saveable
Info::
All images are well-optimized
35 images 993 KB
0 oversized -0 KB
24 legacy format
0 missing dimensions CLS risk
B
JS Execution Cost
816ms total JS execution
REVIEW
816ms total JS execution
Info::
Unattributable: 246ms CPU time
Info::
https://snyk.io/: 186ms CPU time
Info::
https://snyk.io/_next/static/chunks/7909-3e366bfa7...: 128ms CPU time
Info::
https://snyk.io/_next/static/chunks/framework-2ec7...: 115ms CPU time
Info::
https://snyk.io/_next/static/chunks/main-adfdb9879...: 84ms CPU time
Warning::
Third-party scripts: 816ms (100% of total)

Main Thread Breakdown

Script Evaluation 41% Other 32% Style & Layout 14% Script Parsing & Compilation 7% Rendering 4%
ScriptTotalScriptingParse/CompileParty
Unattributable246ms15ms0ms3rd
https://snyk.io/186ms6ms0ms3rd
https://snyk.io/_next/static/chunks/7909-3e366bfa7531aa22.js128ms20ms1ms3rd
https://snyk.io/_next/static/chunks/framework-2ec761b5af9ac788.js115ms102ms4ms3rd
https://snyk.io/_next/static/chunks/main-adfdb9879c87958c.js84ms74ms3ms3rd
https://www.googletagmanager.com/gtag/destination?id=G-X9SH3KP7B4&cx=c&gtm=4e646057ms47ms9ms3rd
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 500 ms 1.0 s 1.5 s FCP 924 ms LCP 1.5 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
189 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 816ms · 309KB · £12/mo
Unattributable
Other
Costly
Execution 246ms
Transfer 0 KB
Monthly Cost £4/mo
snyk.io
Other
Optional
Execution 186ms
Transfer 36 KB
Monthly Cost £3/mo
snyk.io
Other
Optional
Execution 128ms
Transfer 12 KB
Monthly Cost £2/mo
snyk.io
Other
Optional
Execution 115ms
Transfer 59 KB
Unused 37%
Monthly Cost £2/mo
snyk.io
Other
Optional
Execution 84ms
Transfer 39 KB
Monthly Cost £1/mo
Google Tag Manager
Tag Manager
Optional
Execution 57ms
Transfer 163 KB
Unused 42%
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • Unattributable adds 246ms and costs ~£4/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 246ms 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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