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https://www.notion.com

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
79
GRADE
C
FIX
3
REVIEW
3
PASS
6
INFO
2

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

Mobile Desktop
67
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.
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.

786 ms

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

2.37 s

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

360 ms

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

0.024

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

2.14 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.

4.59 s

Page Load Progression

950 ms
1.9 s
2.9 s
3.8 s
4.7 s
5.7 s
6.6 s
7.6 s
Checks
14
6 PASS 3 REVIEW 3 FIX
F
Page Weight Budget
Action
3.6 MB transferred, 191 requests
FIX
3.6 MB transferred, 191 requests
Warning::
Page weighs 9.7 MB (3.6 MB transferred)
Warning::
JavaScript is 1.2 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.2 MB
Warning::
191 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.75 g CO2 per page load
3.6 MB / 2.4 MB budget
3.6 MB transferred
191 requests
0.75 g CO2 per page load
JavaScript 1.2 MiB 35%
Other 943.4 KiB 26%
Images 500.6 KiB 14%
Other 453.2 KiB 12%
Other 172.6 KiB 5%
Fonts 163.1 KiB 4%
CSS 109.3 KiB 3%
HTML 58.2 KiB 2%
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
JS Execution Cost
Action
3167ms total JS execution
FIX
3167ms total JS execution
Warning::
https://www.notion.com/_next/static/chunks/framewo...: 848ms CPU time
Warning::
https://www.notion.com/_next/static/chunks/sentry....: 642ms CPU time
Warning::
https://www.notion.com/: 587ms CPU time
Warning::
Unattributable: 563ms CPU time
Info::
https://www.notion.com/_next/static/chunks/pages/_...: 151ms CPU time
Info::
Third-party scripts: 732ms (23% of total)

Main Thread Breakdown

Script Evaluation 41% Other 29% Style & Layout 17% Script Parsing & Compilation 8%
ScriptTotalScriptingParse/CompileParty
https://www.notion.com/_next/static/chunks/framework-23933e8b27fffebb.js848ms647ms5ms1st
https://www.notion.com/_next/static/chunks/sentry.next.b86bbc7e3c4c69d4.js642ms151ms47ms1st
https://www.notion.com/587ms39ms1ms1st
Unattributable563ms66ms0ms3rd
https://www.notion.com/_next/static/chunks/pages/_app-cc3cb09fde2cc575.js151ms104ms46ms1st
https://transcend-cdn.com/cm/a36a42ad-3a71-444f-9e8a-b19950129dc6/ui.js105ms65ms18ms3rd
https://www.notion.com/_next/static/chunks/72678-7ff9da2b70602702.js95ms84ms10ms1st
https://transcend-cdn.com/cm/a36a42ad-3a71-444f-9e8a-b19950129dc6/airgap.js65ms56ms7ms3rd
https://www.notion.com/_next/static/chunks/main-9070ba6adf5df692.js59ms46ms5ms1st
https://www.notion.com/_next/static/chunks/28247.34de659cc7185b53.js53ms2ms2ms1st
F
JS Bundles
Action
85 scripts, 1.8 MB unused
FIX
85 scripts, 1.8 MB unused
Warning::
https://www.notion.com/_next/static/chunks/sentry....: 171 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: 1.8 MB
1818 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.notion.com/_next/static/chunks/sentry.next.b86bbc7e3c4c69d4.js192 KB171 KB (89%)✓1st
https://www.notion.com/_next/static/chunks/e96d881e-a2a503c1cb8af6df.js0 KB129 KB (60%)✓1st
https://www.notion.com/_next/static/chunks/e96d881e-a2a503c1cb8af6df.js68 KB129 KB (60%)✓1st
https://www.notion.com/_next/static/chunks/17270-bf2dfc8416258a85.js0 KB113 KB (99%)✓1st
https://www.notion.com/_next/static/chunks/17270-bf2dfc8416258a85.js41 KB113 KB (99%)✓1st
https://www.notion.com/_next/static/chunks/95503-1aa967ee7bce5b4e.js67 KB99 KB (57%)✓1st
https://www.notion.com/_next/static/chunks/95503-1aa967ee7bce5b4e.js0 KB99 KB (57%)✓1st
https://www.notion.com/_next/static/chunks/57222-df217cf4a9967285.js0 KB84 KB (75%)✓1st
https://www.notion.com/_next/static/chunks/57222-df217cf4a9967285.js39 KB84 KB (75%)✓1st
https://www.notion.com/_next/static/chunks/pages/_app-cc3cb09fde2cc575.js252 KB80 KB (32%)✓1st

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
Image Optimization
54 images, 0 KB saveable
REVIEW
54 images, 0 KB saveable
Info::
All images are well-optimized
54 images 501 KB
0 oversized -0 KB
24 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

B
HTTP Caching
public, max-age=0
REVIEW
public, max-age=0
Info::
Cache-Control header is set
Got: public, max-age=0
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

public, max-age=0

DirectiveValueMeaning
public—Any cache may store this response
max-age0Cache for 0 seconds
A
Third-Party Impact
38% third-party, 0 ms blocking
PASS
38% third-party, 0 ms blocking
Info::
Third-party code accounts for 38% of page weight (1.4 MiB of 3.6 MiB)
Info::
Third-party blocking time is low (0 ms)
62%
38%
First-party Third-party
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 500 ms 1.0 s 1.5 s 2.0 s FCP 786 ms LCP 2.4 shttps://www.notion.com/front-static/fonts/NotionInter-Regular.woff2NotionInter-Regular.woff2 https://www.notion.com/front-static/fonts/NotionInter-Regular.woff2 — 22.3 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 — 23.1 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 — 23.5 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 — 23.3 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
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
23% of JavaScript execution is third-party
First-party Third-party 732ms · 152KB · $10/mo
Unattributable
Other
Costly
Execution 563ms
Transfer 0 KB
Monthly Cost $7/mo
transcend-cdn.com
Other
Optional
Execution 105ms
Transfer 99 KB
Unused 39%
Monthly Cost $1/mo
transcend-cdn.com
Other
Optional
Execution 65ms
Transfer 54 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 563ms and costs ~$7/month

Unattributable takes 563ms 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

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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