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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
84
GRADE
B
FIX
3
REVIEW
3
PASS
9
INFO
2

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

Mobile Desktop
77
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
88
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
92
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
82
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.

1.82 s

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

1.82 s

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

998 ms

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

0.001

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

1.83 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.

9.61 s

Page Load Progression

418 ms
836 ms
1.3 s
1.7 s
2.1 s
2.5 s
2.9 s
3.3 s
Checks
17
9 PASS 3 REVIEW 3 FIX
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 (1.1 MiB of 1.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2286ms total JS execution
FIX
2286ms total JS execution
Warning::
https://www.nestle.com/cdn-cgi/challenge-platform/...: 847ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-PWR...: 376ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-52R...: 332ms CPU time
Info::
Unattributable: 227ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-57F...: 213ms CPU time
Warning::
Third-party scripts: 2286ms (100% of total)

Main Thread Breakdown

Script Evaluation 74% Script Parsing & Compilation 9% Other 9% Garbage Collection 4%
ScriptTotalScriptingParse/CompileParty
https://www.nestle.com/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=9f07d4aa58d399db847ms819ms14ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PWRZ37376ms303ms46ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-52RBP4PM&gtm=4e64k0332ms242ms71ms3rd
Unattributable227ms5ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-57F7STTF&gtm=4e64k0213ms163ms38ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MDMMZNS8&gtm=4e64k0175ms136ms38ms3rd
https://www.nestle.com/115ms15ms3ms3rd
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
Page Weight Budget
1.1 MB transferred, 25 requests
REVIEW
1.1 MB transferred, 25 requests
Info::
Page weighs 3.1 MB (1.1 MB transferred)
Warning::
JavaScript is 705 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 705 KB
Info::
25 HTTP requests
Info::
Estimated 0.23 g CO2 per page load
1.1 MB / 2.4 MB budget
1.1 MB transferred
25 requests
0.23 g CO2 per page load
JavaScript 705.1 KiB 62%
Other 308.8 KiB 27%
HTML 113.0 KiB 10%
Other 14.4 KiB 1%
Images 1.9 KiB 0%
Other 1.7 KiB 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

C
JS Bundles
Action
13 scripts, 253 KB unused
REVIEW
13 scripts, 253 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-PWR...: 79 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-MDM...: 61 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-52R...: 59 KB unused (34%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-57F...: 54 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 253 KB
253 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-PWRZ37184 KB79 KB (43%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MDMMZNS8&gtm=4e64k0126 KB61 KB (48%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-52RBP4PM&gtm=4e64k0175 KB59 KB (34%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-57F7STTF&gtm=4e64k0132 KB54 KB (41%)✓3rd
https://challenges.cloudflare.com/turnstile/v0/b/0b8fb825cb67/api.js?onload=cFRiY3&render=explicit17 KB—✓3rd
blob:https://www.nestle.com/42f31551-5c25-4d6b-8796-1cc8547088c60 KB—✓3rd
https://www.nestle.com/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=9f07d4aa58d399db71 KB—✓3rd
https://cdn.cookielaw.org/scripttemplates/otSDKStub.js0 KB—✓3rd
blob:https://www.nestle.com/d2621d5c-25f3-4be7-ae41-8a3e2458e40c-0 KB—✓3rd
blob:https://challenges.cloudflare.com/200cec25-ffc6-4feb-8f5a-d456337a18a60 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

B
Page Weight Inventory
25 resources · 1.1 MB · 253 KB savings available
REVIEW
25 resources · 1.1 MB · 253 KB savings available
Warning::
Page weight 121 KB over 1MB target
Got: 1.1 MB Expected: ≤ 1 MB
Info::
~253 KB of savings available
Warning::
23 third-party resources (100% of weight)
Info::
1 resources over 200KB
25 resources · 1.1 MiB · 23 third-party 121.0 KiB over 1MB target
JavaScript 62% · 705.1 KiB
Other 27% · 310.6 KiB
Document 11% · 127.4 KiB
Image 0% · 1.9 KiB

~253.4 KiB of savings available

Remove unused JavaScript: 253.4 KiB
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
2 images, 0 KB saveable
PASS
2 images, 0 KB saveable
Info::
All images are well-optimized
2 images 2 KB
0 oversized -0 KB
2 legacy format
0 missing dimensions CLS risk
A+
Font Loading
No web fonts (system fonts)
PASS
No web fonts (system fonts)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
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
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
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
25 requests over 3048ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 1.8 s LCP 1.8 shttps://nestle.com// https://nestle.com/ — 301 — 288 B — 348 ms — http/1.1https://www.nestle.com/www.nestle.com/ https://www.nestle.com/ — 307 — 60 B — 85 ms — http/1.1https://nestle.com// https://nestle.com/ — 301 — 0 B — 1 ms — http/1.1https://www.nestle.com/www.nestle.com/ https://www.nestle.com/ — 403 — 14.1 KiB — 23 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-PWRZ37www.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-PWRZ37 — 200 — 184.3 KiB — 185 ms — h2https://www.nestle.com/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=9f07d4aa58d399dbwww.nestle.com/cdn-cgi/challenge-pl... https://www.nestle.com/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=9f07d4aa58d399db — 200 — 70.8 KiB — 36 ms — h2blob:https://www.nestle.com/42f31551-5c25-4d6b-8796-1cc8547088c6www.nestle.com/42f31551-5c25-4d6b-8... blob:https://www.nestle.com/42f31551-5c25-4d6b-8796-1cc8547088c6 — -1 — 0 B — 0 ms — https://challenges.cloudflare.com/turnstile/v0/b/0b8fb825cb67/api.js?onload=cFRiY3&render=explicitchallenges.cloudflare.com/turnstile... https://challenges.cloudflare.com/turnstile/v0/b/0b8fb825cb67/api.js?onload=cFRiY3&render=explicit — 200 — 17.4 KiB — 93 ms — h3https://www.googletagmanager.com/gtm.js?id=GTM-MDMMZNS8&gtm=4e64k0www.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-MDMMZNS8&gtm=4e64k0 — 200 — 126.4 KiB — 88 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-57F7STTF&gtm=4e64k0www.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-57F7STTF&gtm=4e64k0 — 200 — 131.8 KiB — 52 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-52RBP4PM&gtm=4e64k0www.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-52RBP4PM&gtm=4e64k0 — 200 — 174.5 KiB — 73 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — -1 — 0 B — 108 ms — https://www.nestle.com/cdn-cgi/challenge-platform/h/b/flow/ov1/927531819:1776892371:vVewUlFmas0srb30l10YFlK8gjcJmXL29Dq7B946IKw/9f07d4aa58d399db/Hd22GuffGouG1d3URMmGct9d7v5H7SquGo.3mE7hmq4-1776894486-1.2.1.1-l9I5eO9pBySpO5o3kbwN35PUCFDsd7kYDy6LPy1FlVm_uRYBRhzxHDXU_i2M6Zr5www.nestle.com/cdn-cgi/challenge-pl... https://www.nestle.com/cdn-cgi/challenge-platform/h/b/flow/ov1/927531819:1776892371:vVewUlFmas0srb30l10YFlK8gjcJmXL29Dq7B946IKw/9f07d4aa58d399db/Hd22GuffGouG1d3URMmGct9d7v5H7SquGo.3mE7hmq4-1776894486-1.2.1.1-l9I5eO9pBySpO5o3kbwN35PUCFDsd7kYDy6LPy1FlVm_uRYBRhzxHDXU_i2M6Zr5 — 200 — 13.6 KiB — 38 ms — h2blob:https://www.nestle.com/d2621d5c-25f3-4be7-ae41-8a3e2458e40cwww.nestle.com/d2621d5c-25f3-4be7-a... blob:https://www.nestle.com/d2621d5c-25f3-4be7-ae41-8a3e2458e40c — 200 — -1 B — 24 ms — blobhttps://challenges.cloudflare.com/cdn-cgi/challenge-platform/h/b/turnstile/f/ov2/av0/rch/nxqii/0x4AAAAAAADnPIDROrmt1Wwj/light/fbE/new/normal?lang=autochallenges.cloudflare.com/cdn-cgi/c... https://challenges.cloudflare.com/cdn-cgi/challenge-platform/h/b/turnstile/f/ov2/av0/rch/nxqii/0x4AAAAAAADnPIDROrmt1Wwj/light/fbE/new/normal?lang=auto — 200 — 99.0 KiB — 105 ms — h3https://challenges.cloudflare.com/cdn-cgi/challenge-platform/h/b/cmg/1challenges.cloudflare.com/cdn-cgi/c... https://challenges.cloudflare.com/cdn-cgi/challenge-platform/h/b/cmg/1 — 200 — 208 B — 21 ms — h3blob:https://challenges.cloudflare.com/200cec25-ffc6-4feb-8f5a-d456337a18a6challenges.cloudflare.com/200cec25-... blob:https://challenges.cloudflare.com/200cec25-ffc6-4feb-8f5a-d456337a18a6 — -1 — 0 B — 0 ms — https://www.nestle.com/favicon.icowww.nestle.com/favicon.ico https://www.nestle.com/favicon.ico — 403 — 14.1 KiB — 25 ms — h2https://challenges.cloudflare.com/cdn-cgi/challenge-platform/h/b/flow/ov1/4100900095:1776892373:L0nL67ly3l9VisnM33R_sKjYxQhSpF0B3njDgeQGRpI/9f07d4ad1c9b2a1a/m0D7Nj1GLc8iMw3oXGQ8IoFdjtX.T2SYWJ7o8xTgEHw-1776894486-1.2.1.1-EAcsknyqLQFH0MS3g4B1WOlU7Hns4YgfDTx2vY7imSpsviP0dhvfZGYAEu6SpefSchallenges.cloudflare.com/cdn-cgi/c... https://challenges.cloudflare.com/cdn-cgi/challenge-platform/h/b/flow/ov1/4100900095:1776892373:L0nL67ly3l9VisnM33R_sKjYxQhSpF0B3njDgeQGRpI/9f07d4ad1c9b2a1a/m0D7Nj1GLc8iMw3oXGQ8IoFdjtX.T2SYWJ7o8xTgEHw-1776894486-1.2.1.1-EAcsknyqLQFH0MS3g4B1WOlU7Hns4YgfDTx2vY7imSpsviP0dhvfZGYAEu6SpefS — 200 — 272.4 KiB — 161 ms — h3blob:https://challenges.cloudflare.com/66f0bd40-4a36-4615-9520-e1a8312d6105challenges.cloudflare.com/66f0bd40-... blob:https://challenges.cloudflare.com/66f0bd40-4a36-4615-9520-e1a8312d6105 — 200 — -1 B — 17 ms — blobhttps://challenges.cloudflare.com/cdn-cgi/challenge-platform/h/b/d/9f07d4ad1c9b2a1a/1776894486890/RN9ks46mllO1mCechallenges.cloudflare.com/cdn-cgi/c... https://challenges.cloudflare.com/cdn-cgi/challenge-platform/h/b/d/9f07d4ad1c9b2a1a/1776894486890/RN9ks46mllO1mCe — 200 — 1.7 KiB — 21 ms — h3blob:https://challenges.cloudflare.com/66f0bd40-4a36-4615-9520-e1a8312d6105challenges.cloudflare.com/66f0bd40-... blob:https://challenges.cloudflare.com/66f0bd40-4a36-4615-9520-e1a8312d6105 — 200 — -1 B — 12 ms — blobhttps://challenges.cloudflare.com/cdn-cgi/challenge-platform/h/b/pat/9f07d4ad1c9b2a1a/1776894486891/94d3ba915f4ebac6791b0809b9f303e582f0b187c587cfcec3ce4008bb1a7498/otbxQfX4u8FM-XRchallenges.cloudflare.com/cdn-cgi/c... https://challenges.cloudflare.com/cdn-cgi/challenge-platform/h/b/pat/9f07d4ad1c9b2a1a/1776894486891/94d3ba915f4ebac6791b0809b9f303e582f0b187c587cfcec3ce4008bb1a7498/otbxQfX4u8FM-XR — 401 — 1.7 KiB — 22 ms — h3https://challenges.cloudflare.com/cdn-cgi/challenge-platform/h/b/flow/ov1/4100900095:1776892373:L0nL67ly3l9VisnM33R_sKjYxQhSpF0B3njDgeQGRpI/9f07d4ad1c9b2a1a/m0D7Nj1GLc8iMw3oXGQ8IoFdjtX.T2SYWJ7o8xTgEHw-1776894486-1.2.1.1-EAcsknyqLQFH0MS3g4B1WOlU7Hns4YgfDTx2vY7imSpsviP0dhvfZGYAEu6SpefSchallenges.cloudflare.com/cdn-cgi/c... https://challenges.cloudflare.com/cdn-cgi/challenge-platform/h/b/flow/ov1/4100900095:1776892373:L0nL67ly3l9VisnM33R_sKjYxQhSpF0B3njDgeQGRpI/9f07d4ad1c9b2a1a/m0D7Nj1GLc8iMw3oXGQ8IoFdjtX.T2SYWJ7o8xTgEHw-1776894486-1.2.1.1-EAcsknyqLQFH0MS3g4B1WOlU7Hns4YgfDTx2vY7imSpsviP0dhvfZGYAEu6SpefS — 200 — 22.8 KiB — 52 ms — h3blob:https://challenges.cloudflare.com/a0e8b22a-ed84-429a-b0fc-e7fd07c33087challenges.cloudflare.com/a0e8b22a-... blob:https://challenges.cloudflare.com/a0e8b22a-ed84-429a-b0fc-e7fd07c33087 — 200 — -1 B — 16 ms — blob
HTML JavaScript CSS Images Fonts XHR/Fetch Other
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 2286ms · 702KB · €25/mo
www.nestle.com
Other
Costly
Execution 847ms
Transfer 71 KB
Monthly Cost €9/mo
Google Tag Manager
Tag Manager
Costly
Execution 376ms
Transfer 184 KB
Unused 43%
Monthly Cost €4/mo
Google Tag Manager
Tag Manager
Costly
Execution 332ms
Transfer 175 KB
Unused 34%
Monthly Cost €4/mo
Unattributable
Other
Costly
Execution 227ms
Transfer 0 KB
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Costly
Execution 213ms
Transfer 132 KB
Unused 41%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 175ms
Transfer 126 KB
Unused 48%
Monthly Cost €2/mo
www.nestle.com
Other
Optional
Execution 115ms
Transfer 14 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.nestle.com adds 847ms and costs ~€9/month
  • Google Tag Manager adds 376ms and costs ~€4/month
  • Google Tag Manager adds 332ms and costs ~€4/month
  • Unattributable adds 227ms and costs ~€2/month
  • Google Tag Manager adds 213ms 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.nestle.com takes 847ms 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 376ms 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 332ms 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 227ms 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 213ms 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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