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Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
67
GRADE
D
FIX
5
REVIEW
2
PASS
5
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.
95
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
85
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.

1.64 s

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

2.32 s

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

486 ms

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

0.005

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

7.73 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.

5.00 s

Page Load Progression

2.4 s
4.8 s
7.1 s
9.5 s
11.9 s
14.3 s
16.7 s
19.1 s
Checks
14
5 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
3.7 MB transferred, 153 requests
FIX
3.7 MB transferred, 153 requests
Warning::
Page weighs 9.3 MB (3.7 MB transferred)
Warning::
JavaScript is 1.7 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.7 MB
Warning::
Images are 1.4 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.4 MB
Warning::
153 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.77 g CO2 per page load
3.7 MB / 2.4 MB budget
3.7 MB transferred
153 requests
0.77 g CO2 per page load
JavaScript 1.7 MiB 47%
Images 1.4 MiB 37%
Fonts 166.0 KiB 4%
CSS 151.5 KiB 4%
Other 148.1 KiB 4%
Other 56.1 KiB 1%
HTML 53.2 KiB 1%
Other 16.4 KiB 0%
Other 571 B 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

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

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 (3.7 MiB of 3.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
7613ms total JS execution
FIX
7613ms total JS execution
Warning::
https://eu.patagonia.com/on/demandware.static/Site...: 2776ms CPU time
Warning::
https://eu.patagonia.com/gb/en/home/: 936ms CPU time
Warning::
https://rapid-cdn.yottaa.com/rapid/lib/WxitjJbVt8B...: 774ms CPU time
Warning::
Unattributable: 636ms CPU time
Warning::
https://cdn.cookielaw.org/scripttemplates/202503.2...: 340ms CPU time
Warning::
Third-party scripts: 7613ms (100% of total)

Main Thread Breakdown

Script Evaluation 44% Other 31% Style & Layout 15% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://eu.patagonia.com/on/demandware.static/Sites-patagonia-eu-Site/-/en_GB/v1775066992435/js/main-modern.js2776ms626ms1ms3rd
https://eu.patagonia.com/gb/en/home/936ms13ms9ms3rd
https://rapid-cdn.yottaa.com/rapid/lib/WxitjJbVt8BvmQ.js774ms738ms9ms3rd
Unattributable636ms9ms0ms3rd
https://cdn.cookielaw.org/scripttemplates/202503.2.0/otBannerSdk.js340ms258ms26ms3rd
https://eu.patagonia.com/on/demandware.static/Sites-patagonia-eu-Site/-/en_GB/v1775066992435/js/chunks/main-3821.4d99ee9dccd452128caf-modern.js317ms221ms4ms3rd
https://matterhorn.eu.patagonia.com/gtm.js?id=GTM-PWM6SX32308ms231ms28ms3rd
https://cdn.cquotient.com/js/v2/gretel.min.js239ms212ms4ms3rd
https://matterhorn.eu.patagonia.com/gtag/js?id=G-7BM4Z0QBKP&cx=c&gtm=4e6411&sign=d67eb852b6814b04a63a8d19e207a145792a8f796c2fc8523094efde25909092_20260404168ms96ms23ms3rd
https://eu.patagonia.com/on/demandware.static/Sites-patagonia-eu-Site/-/en_GB/v1775066992435/js/chunks/main-core-modern.js166ms163ms1ms3rd

Showing top 10 of 20 scripts

F
JS Bundles
Action
63 scripts, 638 KB unused
FIX
63 scripts, 638 KB unused
Warning::
https://eu.patagonia.com/on/demandware.static/Site...: 109 KB unused (62%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://eu.patagonia.com/on/demandware.static/Site...: 70 KB unused (59%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-100...: 64 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://matterhorn.eu.patagonia.com/gtag/js?id=G-7...: 63 KB unused (37%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=DC-973...: 62 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 638 KB
638 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://eu.patagonia.com/on/demandware.static/Sites-patagonia-eu-Site/-/en_GB/v1775066992435/js/main-modern.js177 KB109 KB (62%)✓3rd
https://eu.patagonia.com/on/demandware.static/Sites-patagonia-eu-Site/-/en_GB/v1775066992435/js/chunks/main-core-modern.js119 KB70 KB (59%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-1001361803&cx=c&gtm=4e6411&sign=d67eb852b6814b04a63a8d19e207a145792a8f796c2fc8523094efde25909092_20260404142 KB64 KB (45%)✓3rd
https://matterhorn.eu.patagonia.com/gtag/js?id=G-7BM4Z0QBKP&cx=c&gtm=4e6411&sign=d67eb852b6814b04a63a8d19e207a145792a8f796c2fc8523094efde25909092_20260404173 KB63 KB (37%)✓3rd
https://www.googletagmanager.com/gtag/js?id=DC-9730640&cx=c&gtm=4e6411&sign=d67eb852b6814b04a63a8d19e207a145792a8f796c2fc8523094efde25909092_20260404125 KB62 KB (50%)✓3rd
https://cdn.cookielaw.org/scripttemplates/202503.2.0/otBannerSdk.js117 KB62 KB (53%)✓3rd
https://www.googletagmanager.com/gtag/js?id=DC-9547369&cx=c&gtm=4e6411&sign=d67eb852b6814b04a63a8d19e207a145792a8f796c2fc8523094efde25909092_20260404130 KB60 KB (47%)✓3rd
https://matterhorn.eu.patagonia.com/gtm.js?id=GTM-PWM6SX32182 KB58 KB (32%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-427880931&cx=c&gtm=4e6411&sign=d67eb852b6814b04a63a8d19e207a145792a8f796c2fc8523094efde25909092_20260404147 KB54 KB (37%)✓3rd
https://static.klaviyo.com/onsite/js/build-preview/commit-f6f00cac0c842ff6b918911ae9159db809c1b007/Render.12bfc6d3a0a9b939b8c4.js52 KB37 KB (71%)✓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

D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: max-age=0, no-cache, no-store
Info::
ETag present — enables conditional (304) responses
Cache-Control

max-age=0, no-cache, no-store

DirectiveValueMeaning
max-age0Cache for 0 seconds
no-cache—Cache but always revalidate first
no-store—Never cache this response
C
Image Optimization
Action
34 images, 0 KB saveable
REVIEW
34 images, 0 KB saveable
Warning::
https://eu.patagonia.com/on/demandware.static/-/Li... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://eu.patagonia.com/on/demandware.static/Site... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://eu.patagonia.com/on/demandware.static/Site... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://eu.patagonia.com/on/demandware.static/-/Li... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
34 images 1.4 MB
0 oversized -0 KB
26 legacy format
4 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

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
7 fonts (166 KB)
PASS
7 fonts (166 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

166 KB total

Render-blocking

0

of 7

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 2.0 s FCP 1.6 s LCP 2.3 shttps://eu.patagonia.com/on/demandware.static/Sites-patagonia-eu-Site/-/default/dwf7519470/fonts/RidgewaySans/RidgewaySans.woff2RidgewaySans.woff2 https://eu.patagonia.com/on/demandware.static/Sites-patagonia-eu-Site/-/default/dwf7519470/fonts/RidgewaySans/RidgewaySans.woff2 — 163.9 KiB — 0 ms — font-display: swaphttps://eu.patagonia.com/on/demandware.static/Sites-patagonia-eu-Site/-/default/dw364e6578/fonts/7195d5d0-582f-42d4-86ca-9da8dc31146e.woff27195d5d0-582f-42d4-86ca... https://eu.patagonia.com/on/demandware.static/Sites-patagonia-eu-Site/-/default/dw364e6578/fonts/7195d5d0-582f-42d4-86ca-9da8dc31146e.woff2 — 361 B — 0 ms — font-display: swaphttps://eu.patagonia.com/on/demandware.static/Sites-patagonia-eu-Site/-/default/dw7532db56/fonts/b729a5ee-0221-40db-9a76-7b9e9b747f65.woff2b729a5ee-0221-40db-9a76... https://eu.patagonia.com/on/demandware.static/Sites-patagonia-eu-Site/-/default/dw7532db56/fonts/b729a5ee-0221-40db-9a76-7b9e9b747f65.woff2 — 361 B — 0 ms — font-display: swaphttps://eu.patagonia.com/on/demandware.static/Sites-patagonia-eu-Site/-/default/dw364e6578/fonts/7195d5d0-582f-42d4-86ca-9da8dc31146e.woff27195d5d0-582f-42d4-86ca... https://eu.patagonia.com/on/demandware.static/Sites-patagonia-eu-Site/-/default/dw364e6578/fonts/7195d5d0-582f-42d4-86ca-9da8dc31146e.woff2 — 361 B — 0 ms — font-display: swaphttps://eu.patagonia.com/on/demandware.static/Sites-patagonia-eu-Site/-/default/dw364e6578/fonts/7195d5d0-582f-42d4-86ca-9da8dc31146e.woff27195d5d0-582f-42d4-86ca... https://eu.patagonia.com/on/demandware.static/Sites-patagonia-eu-Site/-/default/dw364e6578/fonts/7195d5d0-582f-42d4-86ca-9da8dc31146e.woff2 — 361 B — 0 ms — font-display: swaphttps://eu.patagonia.com/on/demandware.static/Sites-patagonia-eu-Site/-/default/dw7532db56/fonts/b729a5ee-0221-40db-9a76-7b9e9b747f65.woff2b729a5ee-0221-40db-9a76... https://eu.patagonia.com/on/demandware.static/Sites-patagonia-eu-Site/-/default/dw7532db56/fonts/b729a5ee-0221-40db-9a76-7b9e9b747f65.woff2 — 361 B — 0 ms — font-display: swaphttps://eu.patagonia.com/on/demandware.static/Sites-patagonia-eu-Site/-/default/dw7532db56/fonts/b729a5ee-0221-40db-9a76-7b9e9b747f65.woff2b729a5ee-0221-40db-9a76... https://eu.patagonia.com/on/demandware.static/Sites-patagonia-eu-Site/-/default/dw7532db56/fonts/b729a5ee-0221-40db-9a76-7b9e9b747f65.woff2 — 361 B — 0 ms — font-display: swap
RidgewaySans.woff2 woff2 swap
Size 164 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
7195d5d0-582f-42d4-86ca... woff2 swap
Size 0 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
b729a5ee-0221-40db-9a76... woff2 swap
Size 0 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
7195d5d0-582f-42d4-86ca... woff2 swap
Size 0 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
7195d5d0-582f-42d4-86ca... woff2 swap
Size 0 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
b729a5ee-0221-40db-9a76... woff2 swap
Size 0 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
b729a5ee-0221-40db-9a76... woff2 swap
Size 0 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)

Fixing the unchecked items could save ~82 KB and ~164 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
153 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 7613ms · 1604KB · $101/mo
eu.patagonia.com
Other
Costly
Execution 2776ms
Transfer 177 KB
Unused 62%
Monthly Cost $37/mo
eu.patagonia.com
Other
Costly
Execution 936ms
Transfer 53 KB
Monthly Cost $12/mo
rapid-cdn.yottaa.com
Other
Costly
Execution 774ms
Transfer 45 KB
Monthly Cost $10/mo
Unattributable
Other
Costly
Execution 636ms
Transfer 0 KB
Monthly Cost $8/mo
OneTrust
Consent
Essential
Execution 340ms
Transfer 117 KB
Unused 53%
Monthly Cost $5/mo
eu.patagonia.com
Other
Costly
Execution 317ms
Transfer 24 KB
Monthly Cost $4/mo
matterhorn.eu.patagonia.com
Other
Costly
Execution 308ms
Transfer 182 KB
Unused 32%
Monthly Cost $4/mo
cdn.cquotient.com
Other
Costly
Execution 239ms
Transfer 21 KB
Monthly Cost $3/mo
matterhorn.eu.patagonia.com
Other
Optional
Execution 168ms
Transfer 173 KB
Unused 37%
Monthly Cost $2/mo
eu.patagonia.com
Other
Optional
Execution 166ms
Transfer 119 KB
Unused 59%
Monthly Cost $2/mo
static.klaviyo.com
Other
Optional
Execution 147ms
Transfer 2 KB
Monthly Cost $2/mo
try.abtasty.com
Other
Optional
Execution 140ms
Transfer 52 KB
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 109ms
Transfer 130 KB
Unused 47%
Monthly Cost $1/mo
static.klaviyo.com
Other
Optional
Execution 104ms
Transfer 23 KB
Monthly Cost $1/mo
static.klaviyo.com
Other
Optional
Execution 100ms
Transfer 11 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 87ms
Transfer 147 KB
Unused 37%
Monthly Cost $1/mo
try.abtasty.com
Other
Optional
Execution 76ms
Transfer 8 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 72ms
Transfer 142 KB
Unused 45%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 65ms
Transfer 125 KB
Unused 50%
Monthly Cost $1/mo
static.klaviyo.com
Other
Optional
Execution 52ms
Transfer 52 KB
Unused 71%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • eu.patagonia.com adds 2776ms and costs ~$37/month
  • eu.patagonia.com adds 936ms and costs ~$12/month
  • rapid-cdn.yottaa.com adds 774ms and costs ~$10/month
  • Unattributable adds 636ms and costs ~$8/month
  • eu.patagonia.com adds 317ms and costs ~$4/month
  • matterhorn.eu.patagonia.com adds 308ms and costs ~$4/month
  • cdn.cquotient.com adds 239ms 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

eu.patagonia.com takes 2776ms 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

62% of eu.patagonia.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

eu.patagonia.com takes 936ms 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

rapid-cdn.yottaa.com takes 774ms 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 636ms 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

53% of OneTrust'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

eu.patagonia.com takes 317ms 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

matterhorn.eu.patagonia.com takes 308ms 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

cdn.cquotient.com takes 239ms 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 eu.patagonia.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

71% of static.klaviyo.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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