Performance
· 15 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.
960 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.45 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
154 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.304
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
1.98 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.
4.94 s
Page Load Progression
FPage Weight BudgetAction3.5 MB transferred, 100 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
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.
Source: web.dev
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DJS Execution CostAction2020ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.calm.com/_next/static/chunks/9a0d6000a621abbf.js | 855ms | 670ms | 6ms | 3rd |
| https://www.calm.com/ | 331ms | 4ms | 19ms | 3rd |
| Unattributable | 241ms | 15ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-55DFT24 | 139ms | 116ms | 15ms | 3rd |
| https://www.calm.com/api/12Xk43jk/init.js | 124ms | 114ms | 7ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-782291623&cx=c>m=4e64h1 | 96ms | 83ms | 10ms | 3rd |
| https://www.calm.com/_next/static/chunks/86d1d098e04915b6.js | 94ms | 57ms | 5ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-N4F47DEEC3&cx=c&_slc=1 | 90ms | 74ms | 14ms | 3rd |
| https://connect.facebook.net/en_US/fbevents.js | 52ms | 35ms | 16ms | 3rd |
DJS BundlesAction40 scripts, 465 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.calm.com/_next/static/chunks/6bcc3924f73ddcb7.js | 179 KB | 70 KB (39%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-N4F47DEEC3&cx=c&_slc=1 | 166 KB | 70 KB (42%) | ✓ | 3rd |
| https://www.calm.com/_next/static/chunks/9f12a3de7607ad3c.js | 132 KB | 65 KB (49%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-55DFT24 | 169 KB | 63 KB (37%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-782291623&cx=c>m=4e64h1 | 140 KB | 51 KB (36%) | ✓ | 3rd |
| https://www.calm.com/api/12Xk43jk/init.js | 105 KB | 41 KB (39%) | ✓ | 3rd |
| https://connect.facebook.net/en_US/fbevents.js | 97 KB | 36 KB (37%) | ✓ | 3rd |
| https://www.calm.com/_next/static/chunks/86d1d098e04915b6.js | 50 KB | 27 KB (54%) | ✓ | 3rd |
| https://www.calm.com/_next/static/chunks/9a0d6000a621abbf.js | 66 KB | 24 KB (36%) | ✓ | 3rd |
| https://connect.facebook.net/signals/config/1716780165218419?v=2.9.303&r=stable&domain=www.calm.com&hme=97937018cefade17726f0472876fc101316b2ce9008a35a6a5a7977d7436151a&ex_m=104%2C205%2C154%2C22%2C72%2C73%2C145%2C68%2C67%2C11%2C162%2C90%2C16%2C138%2C127%2C39%2C75%2C78%2C134%2C159%2C164%2C8%2C4%2C5%2C7%2C6%2C3%2C91%2C101%2C165%2C170%2C219%2C62%2C186%2C187%2C55%2C276%2C30%2C74%2C231%2C230%2C229%2C23%2C33%2C103%2C61%2C10%2C63%2C97%2C98%2C99%2C105%2C130%2C31%2C29%2C132%2C133%2C129%2C128%2C155%2C76%2C158%2C156%2C157%2C50%2C60%2C123%2C15%2C161%2C45%2C263%2C264%2C262%2C26%2C27%2C28%2C48%2C146%2C77%2C112%2C18%2C20%2C44%2C40%2C42%2C41%2C83%2C92%2C96%2C110%2C144%2C147%2C46%2C111%2C24%2C21%2C119%2C69%2C36%2C149%2C148%2C150%2C141%2C139%2C25%2C35%2C59%2C109%2C160%2C70%2C17%2C152%2C114%2C81%2C66%2C19%2C85%2C86%2C116%2C84%2C136%2C135%2C34%2C278%2C293%2C212%2C201%2C202%2C200%2C296%2C288%2C52%2C213%2C107%2C131%2C80%2C121%2C54%2C47%2C49%2C113%2C120%2C126%2C58%2C64%2C151%2C115%2C37%2C32%2C53%2C56%2C100%2C163%2C1%2C124%2C14%2C122%2C12%2C2%2C57%2C93%2C65%2C118%2C89%2C88%2C166%2C167%2C94%2C95%2C9%2C125%2C102%2C51%2C142%2C87%2C79%2C71%2C117%2C106%2C43%2C143%2C0%2C82%2C137%2C140%2C153%2C38%2C108%2C13%2C168 | 47 KB | 20 KB (43%) | ✓ | 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 InventoryAction100 resources · 3.5 MB · 465 KB savings availableFIX
~465.1 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 100 resources | 3.5 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization14 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 Loading3 fonts (70 KB)PASS
Web fonts
3
70 KB total
Render-blocking
0
of 3
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 HintsNo optimization neededPASS
Network Waterfall100 requests over 3427msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.calm.com www.calm.com | Other | 855ms | 66 KB | 36% | $11/mo | Costly |
www.calm.com www.calm.com | Other | 331ms | 127 KB | — | $4/mo | Costly |
Unattributable Unattributable | Other | 241ms | 0 KB | — | $3/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 139ms | 169 KB | 37% | $2/mo | Optional |
www.calm.com www.calm.com | Other | 124ms | 105 KB | 39% | $2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 96ms | 140 KB | 36% | $1/mo | Optional |
www.calm.com www.calm.com | Other | 94ms | 50 KB | 54% | $1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 90ms | 166 KB | 42% | $1/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 52ms | 97 KB | 37% | $1/mo | Optional |
These scripts may cost more than they're worth
- www.calm.com adds 855ms and costs ~$11/month
- www.calm.com adds 331ms and costs ~$4/month
- Unattributable adds 241ms 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.calm.com takes 855ms 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.calm.com takes 331ms 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 241ms 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
54% of www.calm.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