Performance
· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
3.57 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
8.35 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
1.37 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.
5.50 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.
18.43 s
Page Load Progression
FPage Weight BudgetAction3.4 MB transferred, 193 requestsFIX
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
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.
High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.
Source: web.dev
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction15167ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.notion.com/ | 5098ms | 71ms | 4ms | 3rd |
| https://www.notion.com/_next/static/chunks/sentry.next.7b192361210a9bb0.js | 3302ms | 515ms | 101ms | 3rd |
| https://www.notion.com/_next/static/chunks/framework-d8039d8c774492db.js | 3116ms | 2590ms | 12ms | 3rd |
| Unattributable | 1293ms | 184ms | 0ms | 3rd |
| https://adora-cdn.com/adora-start.js | 1035ms | 1018ms | 11ms | 3rd |
| https://www.notion.com/_next/static/chunks/pages/_app-c7fee42076fc862b.js | 345ms | 239ms | 104ms | 3rd |
| https://www.notion.com/_next/static/chunks/pages/contact-sales-5c5b15ca2b798a72.js | 252ms | 249ms | 2ms | 3rd |
| https://transcend-cdn.com/cm/a36a42ad-3a71-444f-9e8a-b19950129dc6/airgap.js | 232ms | 176ms | 11ms | 3rd |
| https://transcend-cdn.com/cm/a36a42ad-3a71-444f-9e8a-b19950129dc6/ui.js | 167ms | 127ms | 39ms | 3rd |
| https://www.notion.com/_next/static/chunks/main-477889fa8a461a1b.js | 133ms | 114ms | 9ms | 3rd |
Showing top 10 of 13 scripts
FJS BundlesAction89 scripts, 1.9 MB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.notion.com/_next/static/chunks/sentry.next.7b192361210a9bb0.js | 192 KB | 171 KB (89%) | ✓ | 3rd |
| https://www.notion.com/_next/static/chunks/e96d881e-a2a503c1cb8af6df.js | 0 KB | 129 KB (60%) | ✓ | 3rd |
| https://www.notion.com/_next/static/chunks/e96d881e-a2a503c1cb8af6df.js | 68 KB | 129 KB (60%) | ✓ | 3rd |
| https://www.notion.com/_next/static/chunks/pages/product/%5Bslug%5D-1e3424a9b3bbb166.js | 45 KB | 116 KB (84%) | ✓ | 3rd |
| https://www.notion.com/_next/static/chunks/pages/product/%5Bslug%5D-1e3424a9b3bbb166.js | 0 KB | 116 KB (84%) | ✓ | 3rd |
| https://www.notion.com/_next/static/chunks/17270-15a2f22526fcd0ed.js | 41 KB | 113 KB (99%) | ✓ | 3rd |
| https://www.notion.com/_next/static/chunks/17270-15a2f22526fcd0ed.js | 0 KB | 113 KB (99%) | ✓ | 3rd |
| https://www.notion.com/_next/static/chunks/95503-1aa967ee7bce5b4e.js | 0 KB | 99 KB (57%) | ✓ | 3rd |
| https://www.notion.com/_next/static/chunks/95503-1aa967ee7bce5b4e.js | 67 KB | 99 KB (57%) | ✓ | 3rd |
| https://www.notion.com/_next/static/chunks/57222-d37bafd0bb80a046.js | 0 KB | 84 KB (74%) | ✓ | 3rd |
Consider code splitting or tree shaking to reduce unused code.
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.
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.
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.
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.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
FPage Weight InventoryAction193 resources · 3.4 MB · 1.9 MB savings availableFIX
~1.9 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 193 resources | 3.4 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization49 images, 0 KB saveableREVIEW
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
A+Font Loading6 fonts (163 KB)PASS
Web fonts
6
163 KB total
Render-blocking
0
of 6
Dominant font-display
swap
Most common across fonts
Font loading timeline
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 CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource Hints46 hints, 0 missing preconnectsPASS
Current Resource Hints
46 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall193 requests over 5209msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.notion.com www.notion.com | Other | 5098ms | 57 KB | — | $68/mo | Costly |
www.notion.com www.notion.com | Other | 3302ms | 192 KB | 89% | $44/mo | Costly |
www.notion.com www.notion.com | Other | 3116ms | 46 KB | — | $41/mo | Costly |
Unattributable Unattributable | Other | 1293ms | 0 KB | — | $17/mo | Costly |
adora-cdn.com adora-cdn.com | Other | 1035ms | 47 KB | — | $14/mo | Costly |
www.notion.com www.notion.com | Other | 345ms | 258 KB | 32% | $5/mo | Costly |
www.notion.com www.notion.com | Other | 252ms | 0 KB | — | $3/mo | Costly |
transcend-cdn.com transcend-cdn.com | Other | 232ms | 54 KB | — | $3/mo | Costly |
transcend-cdn.com transcend-cdn.com | Other | 167ms | 99 KB | 39% | $2/mo | Optional |
www.notion.com www.notion.com | Other | 133ms | 41 KB | — | $2/mo | Optional |
www.notion.com www.notion.com | Other | 73ms | 1 KB | — | $1/mo | Optional |
www.notion.com www.notion.com | Other | 61ms | 23 KB | — | $1/mo | Optional |
www.notion.com www.notion.com | Other | 59ms | 36 KB | 80% | $1/mo | Optional |
These scripts may cost more than they're worth
- www.notion.com adds 5098ms and costs ~$68/month
- www.notion.com adds 3302ms and costs ~$44/month
- www.notion.com adds 3116ms and costs ~$41/month
- Unattributable adds 1293ms and costs ~$17/month
- adora-cdn.com adds 1035ms and costs ~$14/month
- www.notion.com adds 345ms and costs ~$5/month
- www.notion.com adds 252ms and costs ~$3/month
- transcend-cdn.com adds 232ms and costs ~$3/month
100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.
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 5098ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
www.notion.com takes 3302ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
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.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
www.notion.com takes 3116ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Unattributable takes 1293ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
adora-cdn.com takes 1035ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
www.notion.com takes 345ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
www.notion.com takes 252ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
transcend-cdn.com takes 232ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
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.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev