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https://supabase.com

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
3
REVIEW
4
PASS
5
INFO
2

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

Mobile Desktop
39
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.

2.74 s

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

8.11 s

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

2.11 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.

5.76 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.

8.74 s

Page Load Progression

602 ms
1.2 s
1.8 s
2.4 s
3.0 s
3.6 s
4.2 s
4.8 s
Checks
14
5 PASS 4 REVIEW 3 FIX
D
Third-Party Impact
Action
83% third-party, 0 ms blocking
FIX
83% third-party, 0 ms blocking
Warning::
Third-party code accounts for 83% of page weight (908.5 KiB of 1.1 MiB)
Info::
Third-party blocking time is low (0 ms)
17%
83%
First-party Third-party
F
JS Execution Cost
Action
8375ms total JS execution
FIX
8375ms total JS execution
Warning::
https://supabase.com/: 2244ms CPU time
Warning::
https://frontend-assets.supabase.com/www/b9e83b25e...: 2038ms CPU time
Warning::
Unattributable: 1174ms CPU time
Warning::
https://frontend-assets.supabase.com/www/b9e83b25e...: 619ms CPU time
Warning::
https://frontend-assets.supabase.com/www/b9e83b25e...: 499ms CPU time
Warning::
Third-party scripts: 6131ms (73% of total)

Main Thread Breakdown

Script Evaluation 41% Other 31% Style & Layout 17% Script Parsing & Compilation 6%
ScriptTotalScriptingParse/CompileParty
https://supabase.com/2244ms32ms2ms1st
https://frontend-assets.supabase.com/www/b9e83b25e1ba/_next/static/chunks/framework-9ae46c84f33751f1.js?dpl=dpl_FPE2NNDnhw7AfVqDWx12ZU3LavCf2038ms1517ms25ms3rd
Unattributable1174ms74ms0ms3rd
https://frontend-assets.supabase.com/www/b9e83b25e1ba/_next/static/chunks/pages/_app-2d07652e5396a24f.js?dpl=dpl_FPE2NNDnhw7AfVqDWx12ZU3LavCf619ms482ms119ms3rd
https://frontend-assets.supabase.com/www/b9e83b25e1ba/_next/static/chunks/8763-daf7a2eb58789e9f.js?dpl=dpl_FPE2NNDnhw7AfVqDWx12ZU3LavCf499ms76ms15ms3rd
https://frontend-assets.supabase.com/www/b9e83b25e1ba/_next/static/chunks/3864.80dc9df12fe3a3ea.js?dpl=dpl_FPE2NNDnhw7AfVqDWx12ZU3LavCf482ms409ms2ms3rd
https://frontend-assets.supabase.com/www/b9e83b25e1ba/_next/static/chunks/main-e3da317e4f576ba0.js?dpl=dpl_FPE2NNDnhw7AfVqDWx12ZU3LavCf316ms274ms27ms3rd
https://frontend-assets.supabase.com/www/b9e83b25e1ba/_next/static/chunks/1561-8f88934073143728.js?dpl=dpl_FPE2NNDnhw7AfVqDWx12ZU3LavCf309ms32ms19ms3rd
https://frontend-assets.supabase.com/www/b9e83b25e1ba/_next/static/chunks/pages/index-dc39e2e954c69d5f.js?dpl=dpl_FPE2NNDnhw7AfVqDWx12ZU3LavCf309ms306ms2ms3rd
https://frontend-assets.supabase.com/www/b9e83b25e1ba/_next/static/chunks/805cecbb.30fda05387834faf.js?dpl=dpl_FPE2NNDnhw7AfVqDWx12ZU3LavCf185ms126ms58ms3rd

Showing top 10 of 13 scripts

D
JS Bundles
Action
55 scripts, 468 KB unused
FIX
55 scripts, 468 KB unused
Warning::
https://frontend-assets.supabase.com/www/b9e83b25e...: 108 KB unused (58%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://frontend-assets.supabase.com/www/b9e83b25e...: 38 KB unused (100%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://frontend-assets.supabase.com/www/b9e83b25e...: 37 KB unused (56%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://frontend-assets.supabase.com/www/b9e83b25e...: 37 KB unused (94%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://frontend-assets.supabase.com/www/b9e83b25e...: 37 KB unused (94%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 468 KB
468 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://frontend-assets.supabase.com/www/b9e83b25e1ba/_next/static/chunks/pages/_app-2d07652e5396a24f.js?dpl=dpl_FPE2NNDnhw7AfVqDWx12ZU3LavCf187 KB108 KB (58%)✓3rd
https://frontend-assets.supabase.com/www/b9e83b25e1ba/_next/static/chunks/7378.44982109f3d544c6.js?dpl=dpl_FPE2NNDnhw7AfVqDWx12ZU3LavCf38 KB38 KB (100%)✓3rd
https://frontend-assets.supabase.com/www/b9e83b25e1ba/_next/static/chunks/805cecbb.30fda05387834faf.js?dpl=dpl_FPE2NNDnhw7AfVqDWx12ZU3LavCf67 KB37 KB (56%)✓3rd
https://frontend-assets.supabase.com/www/b9e83b25e1ba/_next/static/chunks/pages/edge-functions-f9feebb2bf6ca5af.js?dpl=dpl_FPE2NNDnhw7AfVqDWx12ZU3LavCf13 KB37 KB (94%)✓3rd
https://frontend-assets.supabase.com/www/b9e83b25e1ba/_next/static/chunks/pages/edge-functions-f9feebb2bf6ca5af.js?dpl=dpl_FPE2NNDnhw7AfVqDWx12ZU3LavCf0 KB37 KB (94%)✓3rd
https://frontend-assets.supabase.com/www/b9e83b25e1ba/_next/static/chunks/pages/database-710f127a260a527f.js?dpl=dpl_FPE2NNDnhw7AfVqDWx12ZU3LavCf0 KB34 KB (83%)✓3rd
https://frontend-assets.supabase.com/www/b9e83b25e1ba/_next/static/chunks/pages/database-710f127a260a527f.js?dpl=dpl_FPE2NNDnhw7AfVqDWx12ZU3LavCf14 KB34 KB (83%)✓3rd
https://frontend-assets.supabase.com/www/b9e83b25e1ba/_next/static/chunks/pages/storage-34d20781911ff1ad.js?dpl=dpl_FPE2NNDnhw7AfVqDWx12ZU3LavCf0 KB27 KB (79%)✓3rd
https://frontend-assets.supabase.com/www/b9e83b25e1ba/_next/static/chunks/pages/storage-34d20781911ff1ad.js?dpl=dpl_FPE2NNDnhw7AfVqDWx12ZU3LavCf12 KB27 KB (79%)✓3rd
https://frontend-assets.supabase.com/www/b9e83b25e1ba/_next/static/chunks/5486-98c06dd7fb3a9218.js?dpl=dpl_FPE2NNDnhw7AfVqDWx12ZU3LavCf36 KB25 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

B
Page Weight Budget
1.1 MB transferred, 123 requests
REVIEW
1.1 MB transferred, 123 requests
Info::
Page weighs 3.5 MB (1.1 MB transferred)
Warning::
JavaScript is 672 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 672 KB
Warning::
123 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.22 g CO2 per page load
1.1 MB / 2.4 MB budget
1.1 MB transferred
123 requests
0.22 g CO2 per page load
JavaScript 672.2 KiB 61%
Images 143.3 KiB 13%
CSS 65.2 KiB 6%
Other 63.7 KiB 6%
Fonts 52.8 KiB 5%
Other 43.0 KiB 4%
HTML 39.5 KiB 4%
Other 12.7 KiB 1%
Other 624 B 0%
Other 0 B 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

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

C
Image Optimization
Action
36 images, 0 KB saveable
REVIEW
36 images, 0 KB saveable
Warning::
https://supabase.com/images/logos/publicity/1passw... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://supabase.com/images/logos/publicity/langch... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://supabase.com/images/logos/publicity/betash... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://supabase.com/images/logos/publicity/chatba... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://supabase.com/images/logos/publicity/github... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://supabase.com/images/logos/publicity/mobbin... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://supabase.com/images/logos/publicity/submag... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://supabase.com/images/logos/publicity/loops.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
36 images 143 KB
0 oversized -0 KB
34 legacy format
8 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

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

B
HTTP Caching
public, max-age=0, must-revalidate
REVIEW
public, max-age=0, must-revalidate
Info::
Cache-Control header is set
Got: public, max-age=0, must-revalidate
Info::
ETag present — enables conditional (304) responses
Info::
Last-Modified header present
Cache-Control

public, max-age=0, must-revalidate

DirectiveValueMeaning
public—Any cache may store this response
max-age0Cache for 0 seconds
must-revalidate—Must recheck with server after expiry
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
2 fonts (53 KB)
PASS
2 fonts (53 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

53 KB total

Render-blocking

0

of 2

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 5.0 s 6.0 s 7.0 s 8.0 s FCP 2.7 s LCP 8.1 shttps://frontend-assets.supabase.com/www/b9e83b25e1ba/_next/static/media/CustomFont-Book.54303b32.woff2CustomFont-Book.54303b3... https://frontend-assets.supabase.com/www/b9e83b25e1ba/_next/static/media/CustomFont-Book.54303b32.woff2 — 24.9 KiB — 0 ms — font-display: swaphttps://frontend-assets.supabase.com/www/b9e83b25e1ba/_next/static/media/CustomFont-Medium.0cc7d245.woff2CustomFont-Medium.0cc7d... https://frontend-assets.supabase.com/www/b9e83b25e1ba/_next/static/media/CustomFont-Medium.0cc7d245.woff2 — 27.9 KiB — 0 ms — font-display: swap
CustomFont-Book.54303b3... woff2 swap
Size 25 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
CustomFont-Medium.0cc7d... woff2 swap
Size 28 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
7 hints, 0 missing preconnects
PASS
7 hints, 0 missing preconnects
Info::
Page uses 7 resource hint(s)

Current Resource Hints

preconnect
1
preload
6
dns-prefetch
—
prefetch
—

7 resource hints configured

Network Waterfall
123 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
73% of JavaScript execution is third-party
First-party Third-party 6131ms · 492KB · €67/mo
frontend-assets.supabase.com
Other
Costly
Execution 2038ms
Transfer 45 KB
Monthly Cost €22/mo
Unattributable
Other
Costly
Execution 1174ms
Transfer 0 KB
Monthly Cost €13/mo
frontend-assets.supabase.com
Other
Costly
Execution 619ms
Transfer 187 KB
Unused 58%
Monthly Cost €7/mo
frontend-assets.supabase.com
Other
Costly
Execution 499ms
Transfer 25 KB
Monthly Cost €5/mo
frontend-assets.supabase.com
Other
Costly
Execution 482ms
Transfer 2 KB
Monthly Cost €5/mo
frontend-assets.supabase.com
Other
Costly
Execution 316ms
Transfer 39 KB
Monthly Cost €3/mo
frontend-assets.supabase.com
Other
Costly
Execution 309ms
Transfer 40 KB
Unused 54%
Monthly Cost €3/mo
frontend-assets.supabase.com
Other
Costly
Execution 309ms
Transfer 6 KB
Monthly Cost €3/mo
frontend-assets.supabase.com
Other
Optional
Execution 185ms
Transfer 67 KB
Unused 56%
Monthly Cost €2/mo
frontend-assets.supabase.com
Other
Optional
Execution 92ms
Transfer 8 KB
Monthly Cost €1/mo
frontend-assets.supabase.com
Other
Optional
Execution 54ms
Transfer 36 KB
Unused 71%
Monthly Cost €1/mo
frontend-assets.supabase.com
Other
Optional
Execution 54ms
Transfer 38 KB
Unused 100%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • frontend-assets.supabase.com adds 2038ms and costs ~€22/month
  • Unattributable adds 1174ms and costs ~€13/month
  • frontend-assets.supabase.com adds 619ms and costs ~€7/month
  • frontend-assets.supabase.com adds 499ms and costs ~€5/month
  • frontend-assets.supabase.com adds 482ms and costs ~€5/month
  • frontend-assets.supabase.com adds 316ms and costs ~€3/month
  • frontend-assets.supabase.com adds 309ms and costs ~€3/month
  • frontend-assets.supabase.com adds 309ms and costs ~€3/month

73% 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

frontend-assets.supabase.com takes 2038ms 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 1174ms 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

frontend-assets.supabase.com takes 619ms 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

58% of frontend-assets.supabase.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

frontend-assets.supabase.com takes 499ms 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

frontend-assets.supabase.com takes 482ms 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

frontend-assets.supabase.com takes 316ms 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

frontend-assets.supabase.com takes 309ms 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 frontend-assets.supabase.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

frontend-assets.supabase.com takes 309ms 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

56% of frontend-assets.supabase.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 frontend-assets.supabase.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

100% of frontend-assets.supabase.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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