Skip to content
https://www.notion.so

Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
5
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
41
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
97
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
73
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
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.

2.81 s

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

6.02 s

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

2.88 s

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

0.013

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

5.19 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.

26.00 s

Page Load Progression

1.1 s
2.1 s
3.2 s
4.2 s
5.3 s
6.3 s
7.4 s
8.4 s
Checks
16
7 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
3.3 MB transferred, 231 requests
FIX
3.3 MB transferred, 231 requests
Warning::
Page weighs 11.1 MB (3.3 MB transferred)
Warning::
JavaScript is 2.0 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.0 MB
Warning::
231 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.69 g CO2 per page load
3.3 MB / 2.4 MB budget
3.3 MB transferred
231 requests
0.69 g CO2 per page load
JavaScript 2.0 MiB 60%
Other 490.7 KiB 14%
Images 352.5 KiB 10%
Other 194.6 KiB 6%
Fonts 162.6 KiB 5%
CSS 113.3 KiB 3%
HTML 57.6 KiB 2%
Other 788 B 0%
Other 772 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

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 (3.3 MiB of 3.3 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
17076ms total JS execution
FIX
17076ms total JS execution
Warning::
https://www.notion.com/_next/static/chunks/sentry....: 7517ms CPU time
Warning::
https://www.notion.com/: 1987ms CPU time
Warning::
https://www.notion.com/_next/static/chunks/framewo...: 1921ms CPU time
Warning::
Unattributable: 1815ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-MTW...: 555ms CPU time
Warning::
Third-party scripts: 17076ms (100% of total)

Main Thread Breakdown

Script Evaluation 31% Style & Layout 29% Other 25% Rendering 7% Script Parsing & Compilation 6%
ScriptTotalScriptingParse/CompileParty
https://www.notion.com/_next/static/chunks/sentry.next.be9c9dd35e340856.js7517ms597ms130ms3rd
https://www.notion.com/1987ms120ms3ms3rd
https://www.notion.com/_next/static/chunks/framework-23933e8b27fffebb.js1921ms1462ms17ms3rd
Unattributable1815ms225ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MTWKTL4555ms463ms69ms3rd
https://www.notion.com/_next/static/chunks/pages/_app-1ba900149c08adf4.js508ms346ms159ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-10930095205&cx=c&gtm=4e6411430ms371ms54ms3rd
https://www.googletagmanager.com/gtag/js?id=G-9ZJ8CB186L&cx=c&gtm=4e6411420ms343ms65ms3rd
https://www.notion.com/_next/static/chunks/pages/contact-sales-9d6bf5ff4d42d9f4.js235ms231ms3ms3rd
https://transcend-cdn.com/cm/a36a42ad-3a71-444f-9e8a-b19950129dc6/ui.js224ms174ms48ms3rd

Showing top 10 of 23 scripts

F
JS Bundles
Action
105 scripts, 2.2 MB unused
FIX
105 scripts, 2.2 MB unused
Warning::
https://www.notion.com/_next/static/chunks/sentry....: 170 KB unused (89%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.notion.com/_next/static/chunks/e96d881...: 129 KB unused (60%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.notion.com/_next/static/chunks/e96d881...: 129 KB unused (60%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.notion.com/_next/static/chunks/17270-b...: 113 KB unused (99%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.notion.com/_next/static/chunks/17270-b...: 113 KB unused (99%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 2.2 MB
2236 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.notion.com/_next/static/chunks/sentry.next.be9c9dd35e340856.js192 KB170 KB (89%)✓3rd
https://www.notion.com/_next/static/chunks/e96d881e-a2a503c1cb8af6df.js68 KB129 KB (60%)✓3rd
https://www.notion.com/_next/static/chunks/e96d881e-a2a503c1cb8af6df.js0 KB129 KB (60%)✓3rd
https://www.notion.com/_next/static/chunks/17270-bf2dfc8416258a85.js41 KB113 KB (99%)✓3rd
https://www.notion.com/_next/static/chunks/17270-bf2dfc8416258a85.js0 KB113 KB (99%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-695511889&cx=c&gtm=4e6411145 KB104 KB (72%)✓3rd
https://www.notion.com/_next/static/chunks/95503-1aa967ee7bce5b4e.js67 KB99 KB (57%)✓3rd
https://www.notion.com/_next/static/chunks/95503-1aa967ee7bce5b4e.js0 KB99 KB (57%)✓3rd
https://www.notion.com/_next/static/chunks/pages/_app-1ba900149c08adf4.js252 KB80 KB (32%)✓3rd
https://www.notion.com/_next/static/chunks/pages/product/%5Bslug%5D-ff524b0bb483a545.js0 KB69 KB (76%)✓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: no-store
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-store

DirectiveValueMeaning
no-store—Never cache this response
B
Image Optimization
62 images, 0 KB saveable
REVIEW
62 images, 0 KB saveable
Info::
All images are well-optimized
62 images 353 KB
0 oversized -0 KB
38 legacy format
0 missing dimensions CLS risk
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
6 fonts (163 KB)
PASS
6 fonts (163 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

163 KB total

Render-blocking

0

of 6

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 FCP 2.8 s LCP 6.0 shttps://www.notion.com/front-static/fonts/NotionInter-Regular.woff2NotionInter-Regular.woff2 https://www.notion.com/front-static/fonts/NotionInter-Regular.woff2 — 22.2 KiB — 0 ms — font-display: swaphttps://www.notion.com/front-static/fonts/NotionInter-Medium.woff2NotionInter-Medium.woff2 https://www.notion.com/front-static/fonts/NotionInter-Medium.woff2 — 23.0 KiB — 0 ms — font-display: swaphttps://www.notion.com/front-static/fonts/NotionInter-SemiBold.woff2NotionInter-SemiBold.woff2 https://www.notion.com/front-static/fonts/NotionInter-SemiBold.woff2 — 23.3 KiB — 0 ms — font-display: swaphttps://www.notion.com/front-static/fonts/NotionInter-Bold.woff2NotionInter-Bold.woff2 https://www.notion.com/front-static/fonts/NotionInter-Bold.woff2 — 23.1 KiB — 0 ms — font-display: swaphttps://www.notion.com/_next/static/media/LyonText-Regular-Web.d7bfb4be.woff2LyonText-Regular-Web.d7... https://www.notion.com/_next/static/media/LyonText-Regular-Web.d7bfb4be.woff2 — 52.7 KiB — 0 ms — font-display: swaphttps://www.notion.com/_next/static/media/NotionInter-Regular-i18n.4c3206e4.woff2NotionInter-Regular-i18... https://www.notion.com/_next/static/media/NotionInter-Regular-i18n.4c3206e4.woff2 — 18.3 KiB — 0 ms — font-display: swap
NotionInter-Regular.woff2 woff2 swap
Size 22 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
NotionInter-Medium.woff2 woff2 swap
Size 23 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
NotionInter-SemiBold.woff2 woff2 swap
Size 23 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
NotionInter-Bold.woff2 woff2 swap
Size 23 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
LyonText-Regular-Web.d7... woff2 swap
Size 53 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
NotionInter-Regular-i18... woff2 swap
Size 18 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
54 hints, 0 missing preconnects
PASS
54 hints, 0 missing preconnects
Info::
Page uses 54 resource hint(s)

Current Resource Hints

preconnect
3
preload
+20
30
dns-prefetch
—
prefetch
+11
21

54 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
231 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 17076ms · 1670KB · $227/mo
www.notion.com
Other
Costly
Execution 7517ms
Transfer 192 KB
Unused 89%
Monthly Cost $100/mo
www.notion.com
Other
Costly
Execution 1987ms
Transfer 58 KB
Monthly Cost $26/mo
www.notion.com
Other
Costly
Execution 1921ms
Transfer 46 KB
Monthly Cost $26/mo
Unattributable
Other
Costly
Execution 1815ms
Transfer 0 KB
Monthly Cost $24/mo
Google Tag Manager
Tag Manager
Costly
Execution 555ms
Transfer 165 KB
Unused 36%
Monthly Cost $7/mo
www.notion.com
Other
Costly
Execution 508ms
Transfer 252 KB
Unused 32%
Monthly Cost $7/mo
Google Tag Manager
Tag Manager
Costly
Execution 430ms
Transfer 145 KB
Unused 37%
Monthly Cost $6/mo
Google Tag Manager
Tag Manager
Costly
Execution 420ms
Transfer 170 KB
Unused 38%
Monthly Cost $6/mo
www.notion.com
Other
Costly
Execution 235ms
Transfer 0 KB
Monthly Cost $3/mo
transcend-cdn.com
Other
Costly
Execution 224ms
Transfer 98 KB
Unused 46%
Monthly Cost $3/mo
www.notion.com
Other
Costly
Execution 210ms
Transfer 15 KB
Monthly Cost $3/mo
Facebook Pixel
Advertising
Optional
Execution 181ms
Transfer 95 KB
Unused 39%
Monthly Cost $2/mo
www.notion.com
Other
Optional
Execution 164ms
Transfer 41 KB
Monthly Cost $2/mo
www.notion.com
Other
Optional
Execution 141ms
Transfer 1 KB
Monthly Cost $2/mo
www.notion.com
Other
Optional
Execution 120ms
Transfer 24 KB
Monthly Cost $2/mo
transcend-cdn.com
Other
Optional
Execution 108ms
Transfer 54 KB
Monthly Cost $1/mo
Facebook Pixel
Advertising
Optional
Execution 106ms
Transfer 37 KB
Monthly Cost $1/mo
www.notion.com
Other
Optional
Execution 99ms
Transfer 36 KB
Unused 80%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 87ms
Transfer 145 KB
Unused 72%
Monthly Cost $1/mo
LinkedIn Insight
Advertising
Optional
Execution 81ms
Transfer 19 KB
Monthly Cost $1/mo
Twitter/X Pixel
Advertising
Optional
Execution 62ms
Transfer 13 KB
Monthly Cost $1/mo
ssl.pstatic.net
Other
Optional
Execution 53ms
Transfer 18 KB
Monthly Cost $1/mo
adora-cdn.com
Other
Optional
Execution 51ms
Transfer 47 KB
Unused 79%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.notion.com adds 7517ms and costs ~$100/month
  • www.notion.com adds 1987ms and costs ~$26/month
  • www.notion.com adds 1921ms and costs ~$26/month
  • Unattributable adds 1815ms and costs ~$24/month
  • Google Tag Manager adds 555ms and costs ~$7/month
  • www.notion.com adds 508ms and costs ~$7/month
  • Google Tag Manager adds 430ms and costs ~$6/month
  • Google Tag Manager adds 420ms and costs ~$6/month
  • www.notion.com adds 235ms and costs ~$3/month
  • transcend-cdn.com adds 224ms and costs ~$3/month
  • www.notion.com adds 210ms 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

www.notion.com takes 7517ms 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

89% of www.notion.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

www.notion.com takes 1987ms 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

www.notion.com takes 1921ms 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 1815ms 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 555ms 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

www.notion.com takes 508ms 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 430ms 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 420ms 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

www.notion.com takes 235ms 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

transcend-cdn.com takes 224ms 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

www.notion.com takes 210ms 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

80% of www.notion.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

72% 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

79% of adora-cdn.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.

Send Feedback