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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
83
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.
77
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.

634 ms

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

915 ms

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

350 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.

944 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

1.98 s

Page Load Progression

639 ms
1.3 s
1.9 s
2.6 s
3.2 s
3.8 s
4.5 s
5.1 s
Checks
14
5 PASS 4 REVIEW 3 FIX
D
Third-Party Impact
Action
81% third-party, 0 ms blocking
FIX
81% third-party, 0 ms blocking
Warning::
Third-party code accounts for 81% of page weight (886.9 KiB of 1.1 MiB)
Info::
Third-party blocking time is low (0 ms)
19%
81%
First-party Third-party
D
JS Execution Cost
Action
2814ms total JS execution
FIX
2814ms total JS execution
Warning::
https://supabase.com/: 1303ms CPU time
Warning::
https://frontend-assets.supabase.com/www/b9e83b25e...: 493ms CPU time
Warning::
Unattributable: 354ms CPU time
Info::
https://frontend-assets.supabase.com/www/b9e83b25e...: 174ms CPU time
Info::
https://frontend-assets.supabase.com/www/b9e83b25e...: 133ms CPU time
Warning::
Third-party scripts: 1511ms (54% of total)

Main Thread Breakdown

Other 35% Script Evaluation 33% Style & Layout 21% Rendering 4% Script Parsing & Compilation 3%
ScriptTotalScriptingParse/CompileParty
https://supabase.com/1303ms11ms1ms1st
https://frontend-assets.supabase.com/www/b9e83b25e1ba/_next/static/chunks/framework-9ae46c84f33751f1.js?dpl=dpl_FPE2NNDnhw7AfVqDWx12ZU3LavCf493ms427ms5ms3rd
Unattributable354ms26ms0ms3rd
https://frontend-assets.supabase.com/www/b9e83b25e1ba/_next/static/chunks/pages/_app-2d07652e5396a24f.js?dpl=dpl_FPE2NNDnhw7AfVqDWx12ZU3LavCf174ms139ms28ms3rd
https://frontend-assets.supabase.com/www/b9e83b25e1ba/_next/static/chunks/3864.80dc9df12fe3a3ea.js?dpl=dpl_FPE2NNDnhw7AfVqDWx12ZU3LavCf133ms109ms0ms3rd
https://frontend-assets.supabase.com/www/b9e83b25e1ba/_next/static/chunks/8763-daf7a2eb58789e9f.js?dpl=dpl_FPE2NNDnhw7AfVqDWx12ZU3LavCf124ms21ms3ms3rd
https://frontend-assets.supabase.com/www/b9e83b25e1ba/_next/static/chunks/pages/index-dc39e2e954c69d5f.js?dpl=dpl_FPE2NNDnhw7AfVqDWx12ZU3LavCf91ms90ms1ms3rd
https://frontend-assets.supabase.com/www/b9e83b25e1ba/_next/static/chunks/main-e3da317e4f576ba0.js?dpl=dpl_FPE2NNDnhw7AfVqDWx12ZU3LavCf75ms66ms5ms3rd
https://frontend-assets.supabase.com/www/b9e83b25e1ba/_next/static/chunks/1561-8f88934073143728.js?dpl=dpl_FPE2NNDnhw7AfVqDWx12ZU3LavCf66ms11ms5ms3rd
D
JS Bundles
Action
53 scripts, 412 KB unused
FIX
53 scripts, 412 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...: 38 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: 412 KB
412 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 KB38 KB (56%)✓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/edge-functions-f9feebb2bf6ca5af.js?dpl=dpl_FPE2NNDnhw7AfVqDWx12ZU3LavCf13 KB37 KB (94%)✓3rd
https://frontend-assets.supabase.com/www/b9e83b25e1ba/_next/static/chunks/pages/database-710f127a260a527f.js?dpl=dpl_FPE2NNDnhw7AfVqDWx12ZU3LavCf0 KB32 KB (80%)✓3rd
https://frontend-assets.supabase.com/www/b9e83b25e1ba/_next/static/chunks/pages/database-710f127a260a527f.js?dpl=dpl_FPE2NNDnhw7AfVqDWx12ZU3LavCf14 KB32 KB (80%)✓3rd
https://frontend-assets.supabase.com/www/b9e83b25e1ba/_next/static/chunks/5486-98c06dd7fb3a9218.js?dpl=dpl_FPE2NNDnhw7AfVqDWx12ZU3LavCf35 KB25 KB (70%)✓3rd
https://frontend-assets.supabase.com/www/b9e83b25e1ba/_next/static/chunks/1561-8f88934073143728.js?dpl=dpl_FPE2NNDnhw7AfVqDWx12ZU3LavCf40 KB22 KB (54%)✓3rd
https://frontend-assets.supabase.com/www/b9e83b25e1ba/_next/static/chunks/pages/auth-5d3542c39c64a05b.js?dpl=dpl_FPE2NNDnhw7AfVqDWx12ZU3LavCf0 KB21 KB (80%)✓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, 127 requests
REVIEW
1.1 MB transferred, 127 requests
Info::
Page weighs 3.6 MB (1.1 MB transferred)
Warning::
JavaScript is 665 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 665 KB
Warning::
127 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
127 requests
0.22 g CO2 per page load
JavaScript 664.7 KiB 61%
Images 151.6 KiB 14%
CSS 65.1 KiB 6%
Fonts 52.8 KiB 5%
Other 52.6 KiB 5%
Other 51.5 KiB 5%
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
42 images, 0 KB saveable
REVIEW
42 images, 0 KB saveable
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/submag... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
42 images 152 KB
0 oversized -0 KB
39 legacy format
2 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

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 500 ms 1.0 s FCP 634 ms LCP 915 mshttps://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 — 28.1 KiB — 0 ms — font-display: swaphttps://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 — 24.7 KiB — 0 ms — font-display: swap
CustomFont-Medium.0cc7d... woff2 swap
Size 28 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
CustomFont-Book.54303b3... woff2 swap
Size 25 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
127 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
54% of JavaScript execution is third-party
First-party Third-party 1511ms · 343KB · €16/mo
frontend-assets.supabase.com
Other
Costly
Execution 493ms
Transfer 45 KB
Monthly Cost €5/mo
Unattributable
Other
Costly
Execution 354ms
Transfer 0 KB
Monthly Cost €4/mo
frontend-assets.supabase.com
Other
Optional
Execution 174ms
Transfer 187 KB
Unused 58%
Monthly Cost €2/mo
frontend-assets.supabase.com
Other
Optional
Execution 133ms
Transfer 2 KB
Monthly Cost €1/mo
frontend-assets.supabase.com
Other
Optional
Execution 124ms
Transfer 25 KB
Monthly Cost €1/mo
frontend-assets.supabase.com
Other
Optional
Execution 91ms
Transfer 5 KB
Monthly Cost €1/mo
frontend-assets.supabase.com
Other
Optional
Execution 75ms
Transfer 39 KB
Monthly Cost €1/mo
frontend-assets.supabase.com
Other
Optional
Execution 66ms
Transfer 40 KB
Unused 54%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • frontend-assets.supabase.com adds 493ms and costs ~€5/month
  • Unattributable adds 354ms and costs ~€4/month

54% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

frontend-assets.supabase.com takes 493ms 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 354ms 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

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

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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