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Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
5
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
25
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
92
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.

7.42 s

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

22.14 s

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

6.13 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.

13.02 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.

26.92 s

Page Load Progression

873 ms
1.7 s
2.6 s
3.5 s
4.4 s
5.2 s
6.1 s
7.0 s
Checks
16
7 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
37.5 MB transferred, 191 requests
FIX
37.5 MB transferred, 191 requests
Critical::
Page weighs 46.6 MB (37.5 MB transferred)
Warning::
JavaScript is 2.2 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.2 MB
Info::
CSS is 237 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 237 KB
Warning::
191 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 7.9 g CO2 per page load
37.5 MB / 2.4 MB budget
37.5 MB transferred
191 requests
7.9 g CO2 per page load
Other 26.8 MiB 72%
Other 7.5 MiB 20%
JavaScript 2.2 MiB 6%
Images 455.5 KiB 1%
CSS 237.4 KiB 1%
Other 127.3 KiB 0%
HTML 62.7 KiB 0%
Other 34.2 KiB 0%
Fonts 34.2 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

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 (37.5 MiB of 37.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
16726ms total JS execution
FIX
16726ms total JS execution
Warning::
https://assets.squarespace.com/universal/scripts-c...: 5432ms CPU time
Warning::
https://stability.ai/: 2797ms CPU time
Warning::
Unattributable: 2175ms CPU time
Warning::
https://assets.squarespace.com/universal/scripts-c...: 1078ms CPU time
Warning::
https://js-eu1.hs-analytics.net/analytics/17755878...: 1002ms CPU time
Warning::
Third-party scripts: 16726ms (100% of total)

Main Thread Breakdown

Script Evaluation 52% Other 27% Style & Layout 10% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
https://assets.squarespace.com/universal/scripts-compressed/88866-5394a004a66629ac-min.en-US.js5432ms4445ms3ms3rd
https://stability.ai/2797ms57ms16ms3rd
Unattributable2175ms83ms0ms3rd
https://assets.squarespace.com/universal/scripts-compressed/20071-94fe583b17bbec73-min.en-US.js1078ms913ms40ms3rd
https://js-eu1.hs-analytics.net/analytics/1775587800000/26117460.js1002ms502ms8ms3rd
https://assets.squarespace.com/universal/scripts-compressed/common-09a94e6901cb9805-min.en-US.js810ms569ms87ms3rd
https://www.googletagmanager.com/gtag/js?id=G-W4CMY55YQZ&cx=c&gtm=4e6460503ms358ms49ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MJB2MFP5484ms430ms46ms3rd
https://static1.squarespace.com/static/vta/5c5a519771c10ba3470d8101/scripts/7064.c3355fa52c00d534a2ca.js396ms332ms50ms3rd
https://static1.squarespace.com/static/vta/5c5a519771c10ba3470d8101/scripts/site-bundle.3107408ccb15b3bd5667ba444170be7b.js385ms142ms9ms3rd

Showing top 10 of 21 scripts

F
JS Bundles
Action
70 scripts, 908 KB unused
FIX
70 scripts, 908 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=AW-170...: 113 KB unused (64%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static1.squarespace.com/static/vta/5c5a519...: 85 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: 908 KB
908 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=AW-17025025326&cx=c&gtm=4e6460177 KB113 KB (64%)✓3rd
https://static1.squarespace.com/static/vta/5c5a519771c10ba3470d8101/scripts/7064.c3355fa52c00d534a2ca.js165 KB85 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=G-W4CMY55YQZ&cx=c&gtm=4e6460177 KB60 KB (34%)✓3rd
https://assets.squarespace.com/universal/scripts-compressed/extract-css-moment-js-vendor-6f2a1f6ec9a41489-min.en-US.js60 KB59 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
27 images, 0 KB saveable
REVIEW
27 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.
27 images 164 KB
0 oversized -0 KB
14 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
1 fonts (34 KB)
PASS
1 fonts (34 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

34 KB total

Render-blocking

0

of 1

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 16.0 s 18.0 s 20.0 s 22.0 s FCP 7.4 s LCP 22.1 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: swap
k3kPo8UDI-1M0wlSV9XAw6l... woff2 swap
Size 34 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)
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
3 hints, 0 missing preconnects
PASS
3 hints, 0 missing preconnects
Info::
Page uses 3 resource hint(s)

Current Resource Hints

preconnect
3
preload
—
dns-prefetch
—
prefetch
—

3 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
191 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 16726ms · 1996KB · $96/mo
assets.squarespace.com
Other
Costly
Execution 5432ms
Transfer 15 KB
Monthly Cost $31/mo
stability.ai
Other
Costly
Execution 2797ms
Transfer 63 KB
Monthly Cost $16/mo
Unattributable
Other
Costly
Execution 2175ms
Transfer 0 KB
Monthly Cost $12/mo
assets.squarespace.com
Other
Costly
Execution 1078ms
Transfer 141 KB
Unused 48%
Monthly Cost $6/mo
js-eu1.hs-analytics.net
Other
Costly
Execution 1002ms
Transfer 43 KB
Monthly Cost $6/mo
assets.squarespace.com
Other
Costly
Execution 810ms
Transfer 276 KB
Unused 62%
Monthly Cost $5/mo
Google Tag Manager
Tag Manager
Costly
Execution 503ms
Transfer 177 KB
Unused 34%
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Costly
Execution 484ms
Transfer 161 KB
Unused 42%
Monthly Cost $3/mo
static1.squarespace.com
Other
Costly
Execution 396ms
Transfer 165 KB
Unused 52%
Monthly Cost $2/mo
static1.squarespace.com
Other
Costly
Execution 385ms
Transfer 38 KB
Monthly Cost $2/mo
cdn-ukwest.onetrust.com
Other
Costly
Execution 330ms
Transfer 118 KB
Unused 54%
Monthly Cost $2/mo
js-eu1.hsforms.net
Other
Costly
Execution 267ms
Transfer 194 KB
Unused 40%
Monthly Cost $2/mo
aws-eu-sqsmods.s3.eu-west-2.amazonaws.com
Other
Costly
Execution 216ms
Transfer 19 KB
Monthly Cost $1/mo
jsDelivr
CDN
Costly
Execution 209ms
Transfer 6 KB
Monthly Cost $1/mo
assets.squarespace.com
Other
Optional
Execution 181ms
Transfer 17 KB
Monthly Cost $1/mo
assets.squarespace.com
Other
Optional
Execution 104ms
Transfer 9 KB
Monthly Cost $1/mo
assets.squarespace.com
Other
Optional
Execution 91ms
Transfer 42 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 71ms
Transfer 177 KB
Unused 64%
Monthly Cost $0/mo
assets.squarespace.com
Other
Optional
Execution 68ms
Transfer 60 KB
Unused 98%
Monthly Cost $0/mo
assets.squarespace.com
Other
Optional
Execution 68ms
Transfer 168 KB
Unused 37%
Monthly Cost $0/mo
static1.squarespace.com
Other
Optional
Execution 59ms
Transfer 110 KB
Monthly Cost $0/mo

These scripts may cost more than they're worth

  • assets.squarespace.com adds 5432ms and costs ~$31/month
  • stability.ai adds 2797ms and costs ~$16/month
  • Unattributable adds 2175ms and costs ~$12/month
  • assets.squarespace.com adds 1078ms and costs ~$6/month
  • js-eu1.hs-analytics.net adds 1002ms and costs ~$6/month
  • assets.squarespace.com adds 810ms and costs ~$5/month
  • Google Tag Manager adds 503ms and costs ~$3/month
  • Google Tag Manager adds 484ms and costs ~$3/month
  • static1.squarespace.com adds 396ms and costs ~$2/month
  • static1.squarespace.com adds 385ms and costs ~$2/month
  • cdn-ukwest.onetrust.com adds 330ms and costs ~$2/month
  • js-eu1.hsforms.net adds 267ms and costs ~$2/month
  • aws-eu-sqsmods.s3.eu-west-2.amazonaws.com adds 216ms and costs ~$1/month
  • jsDelivr adds 209ms and costs ~$1/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 5432ms 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 2797ms 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 2175ms 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 1078ms 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 1002ms 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 810ms 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

Google Tag Manager takes 503ms 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 484ms 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

static1.squarespace.com takes 396ms 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

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

static1.squarespace.com takes 385ms 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-ukwest.onetrust.com takes 330ms 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

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

js-eu1.hsforms.net takes 267ms 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

aws-eu-sqsmods.s3.eu-west-2.amazonaws.com takes 216ms 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

jsDelivr takes 209ms 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

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

98% 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

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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