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Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
5
REVIEW
2
PASS
5
INFO
2

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

Mobile Desktop
32
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.
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.

1.98 s

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

4.45 s

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

1.27 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.

4.99 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.

6.47 s

Page Load Progression

981 ms
2.0 s
2.9 s
3.9 s
4.9 s
5.9 s
6.9 s
7.8 s
Checks
14
5 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
31.5 MB transferred, 192 requests
FIX
31.5 MB transferred, 192 requests
Critical::
Page weighs 43.4 MB (31.5 MB transferred)
Warning::
JavaScript is 2.4 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.4 MB
Warning::
Images are 1.5 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.5 MB
Info::
Fonts are 297 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 297 KB
Info::
CSS is 239 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 239 KB
Warning::
192 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 6.6 g CO2 per page load
31.5 MB / 2.4 MB budget
31.5 MB transferred
192 requests
6.6 g CO2 per page load
Other 26.8 MiB 85%
JavaScript 2.4 MiB 8%
Images 1.5 MiB 5%
Fonts 297.4 KiB 1%
CSS 239.0 KiB 1%
Other 127.3 KiB 0%
HTML 69.9 KiB 0%
Other 34.7 KiB 0%
Other 32.9 KiB 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

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

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

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 (31.5 MiB of 31.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
5187ms total JS execution
FIX
5187ms total JS execution
Warning::
https://assets.squarespace.com/universal/scripts-c...: 2017ms CPU time
Warning::
https://stability.ai/: 914ms CPU time
Warning::
Unattributable: 550ms CPU time
Warning::
https://assets.squarespace.com/universal/scripts-c...: 462ms CPU time
Warning::
https://js-eu1.hs-analytics.net/analytics/17755878...: 357ms CPU time
Warning::
Third-party scripts: 5187ms (100% of total)

Main Thread Breakdown

Script Evaluation 55% Other 26% Style & Layout 9% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
https://assets.squarespace.com/universal/scripts-compressed/88866-5394a004a66629ac-min.en-US.js2017ms1547ms1ms3rd
https://stability.ai/914ms20ms5ms3rd
Unattributable550ms22ms0ms3rd
https://assets.squarespace.com/universal/scripts-compressed/20071-94fe583b17bbec73-min.en-US.js462ms371ms10ms3rd
https://js-eu1.hs-analytics.net/analytics/1775587800000/26117460.js357ms272ms3ms3rd
https://assets.squarespace.com/universal/scripts-compressed/common-09a94e6901cb9805-min.en-US.js190ms141ms22ms3rd
https://static1.squarespace.com/static/vta/5c5a519771c10ba3470d8101/scripts/site-bundle.3107408ccb15b3bd5667ba444170be7b.js143ms33ms2ms3rd
https://static1.squarespace.com/static/vta/5c5a519771c10ba3470d8101/scripts/7064.c3355fa52c00d534a2ca.js113ms88ms12ms3rd
https://www.googletagmanager.com/gtag/js?id=G-W4CMY55YQZ&cx=c&gtm=4e6461h292ms51ms41ms3rd
https://js-eu1.hsforms.net/forms/embed/v2.js81ms56ms21ms3rd

Showing top 10 of 14 scripts

F
JS Bundles
Action
74 scripts, 884 KB unused
FIX
74 scripts, 884 KB unused
Warning::
https://assets.squarespace.com/universal/scripts-c...: 171 KB unused (62%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-W4CM...: 113 KB unused (64%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static1.squarespace.com/static/vta/5c5a519...: 75 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://js-eu1.hsforms.net/forms/embed/v2.js: 74 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://assets.squarespace.com/universal/scripts-c...: 67 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 884 KB
884 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://assets.squarespace.com/universal/scripts-compressed/common-09a94e6901cb9805-min.en-US.js276 KB171 KB (62%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-W4CMY55YQZ&cx=c&gtm=4e6461h2177 KB113 KB (64%)✓3rd
https://static1.squarespace.com/static/vta/5c5a519771c10ba3470d8101/scripts/7064.c3355fa52c00d534a2ca.js165 KB75 KB (52%)✓3rd
https://js-eu1.hsforms.net/forms/embed/v2.js194 KB74 KB (40%)✓3rd
https://assets.squarespace.com/universal/scripts-compressed/20071-94fe583b17bbec73-min.en-US.js141 KB67 KB (48%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MJB2MFP5161 KB67 KB (42%)✓3rd
https://cdn-ukwest.onetrust.com/scripttemplates/202504.1.0/otBannerSdk.js118 KB64 KB (54%)✓3rd
https://assets.squarespace.com/universal/scripts-compressed/common-vendors-41f73026a0e85b2c-min.en-US.js168 KB62 KB (37%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-17025025326&cx=c&gtm=4e6461h2177 KB61 KB (35%)✓3rd
https://assets.squarespace.com/universal/scripts-compressed/extract-css-moment-js-vendor-6f2a1f6ec9a41489-min.en-US.js44 KB43 KB (98%)✓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
23 images, 0 KB saveable
REVIEW
23 images, 0 KB saveable
Warning::
https://images.squarespace-cdn.com/content/v1/6213... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
23 images 1.5 MB
0 oversized -0 KB
12 legacy format
1 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

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
4 fonts (297 KB)
PASS
4 fonts (297 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

297 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 FCP 2.0 s LCP 4.4 shttps://fonts.gstatic.com/s/archivo/v25/k3kPo8UDI-1M0wlSV9XAw6lQkqWY8Q82sLydOxKsv4Rn.woff2k3kPo8UDI-1M0wlSV9XAw6l... https://fonts.gstatic.com/s/archivo/v25/k3kPo8UDI-1M0wlSV9XAw6lQkqWY8Q82sLydOxKsv4Rn.woff2 — 34.2 KiB — 0 ms — font-display: swaphttps://26117460.hs-sites-eu1.com/_hcms/googlefonts/Inter/700.woff2700.woff2 https://26117460.hs-sites-eu1.com/_hcms/googlefonts/Inter/700.woff2 — 110.1 KiB — 0 ms — font-display: swaphttps://26117460.hs-sites-eu1.com/_hcms/googlefonts/Inter/regular.woff2regular.woff2 https://26117460.hs-sites-eu1.com/_hcms/googlefonts/Inter/regular.woff2 — 106.0 KiB — 0 ms — font-display: swaphttps://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7.woff2UcC73FwrK3iLTeHuS_nVMrM... https://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7.woff2 — 47.2 KiB — 0 ms — font-display: swap
k3kPo8UDI-1M0wlSV9XAw6l... woff2 swap
Size 34 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
700.woff2 woff2 swap
Size 110 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
regular.woff2 woff2 swap
Size 106 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
UcC73FwrK3iLTeHuS_nVMrM... woff2 swap
Size 47 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 ~108 KB and ~216 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
192 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 5187ms · 1584KB · $30/mo
assets.squarespace.com
Other
Costly
Execution 2017ms
Transfer 15 KB
Monthly Cost $12/mo
stability.ai
Other
Costly
Execution 914ms
Transfer 63 KB
Monthly Cost $5/mo
Unattributable
Other
Costly
Execution 550ms
Transfer 0 KB
Monthly Cost $3/mo
assets.squarespace.com
Other
Costly
Execution 462ms
Transfer 141 KB
Unused 48%
Monthly Cost $3/mo
js-eu1.hs-analytics.net
Other
Costly
Execution 357ms
Transfer 43 KB
Monthly Cost $2/mo
assets.squarespace.com
Other
Optional
Execution 190ms
Transfer 276 KB
Unused 62%
Monthly Cost $1/mo
static1.squarespace.com
Other
Optional
Execution 143ms
Transfer 38 KB
Monthly Cost $1/mo
static1.squarespace.com
Other
Optional
Execution 113ms
Transfer 165 KB
Unused 52%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 92ms
Transfer 177 KB
Unused 64%
Monthly Cost $1/mo
js-eu1.hsforms.net
Other
Optional
Execution 81ms
Transfer 194 KB
Unused 40%
Monthly Cost $0/mo
Google Tag Manager
Tag Manager
Optional
Execution 79ms
Transfer 161 KB
Unused 42%
Monthly Cost $0/mo
Google Tag Manager
Tag Manager
Optional
Execution 78ms
Transfer 177 KB
Unused 35%
Monthly Cost $0/mo
aws-eu-sqsmods.s3.eu-west-2.amazonaws.com
Other
Optional
Execution 57ms
Transfer 19 KB
Monthly Cost $0/mo
cdn-ukwest.onetrust.com
Other
Optional
Execution 55ms
Transfer 118 KB
Unused 54%
Monthly Cost $0/mo

These scripts may cost more than they're worth

  • assets.squarespace.com adds 2017ms and costs ~$12/month
  • stability.ai adds 914ms and costs ~$5/month
  • Unattributable adds 550ms and costs ~$3/month
  • assets.squarespace.com adds 462ms and costs ~$3/month
  • js-eu1.hs-analytics.net adds 357ms 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

assets.squarespace.com takes 2017ms 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

stability.ai takes 914ms 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 550ms 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

assets.squarespace.com takes 462ms 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

js-eu1.hs-analytics.net takes 357ms 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 assets.squarespace.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

52% of static1.squarespace.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

64% of Google Tag Manager'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

54% of cdn-ukwest.onetrust.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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