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.
544 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
3.34 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
249 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.099
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
2.15 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.
3.36 s
Page Load Progression
FPage Weight BudgetAction3.3 MB transferred, 149 requestsFIX
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
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
Subset fonts to include only used characters, or switch to system font stacks.
Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).
Source: web.dev font loading
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
DJS Execution CostAction2716ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.headspace.com/web-marketing-ssr/_next/static/chunks/1a0bb58acbf0b64b.js | 742ms | 650ms | 4ms | 3rd |
| https://www.headspace.com/web-marketing-ssr/_next/static/chunks/c15c7cf7199d6fd1.js | 686ms | 256ms | 1ms | 3rd |
| https://www.headspace.com/web-marketing-ssr/_next/static/chunks/d775b5b016d581e0.js | 394ms | 65ms | 3ms | 3rd |
| Unattributable | 260ms | 34ms | 0ms | 3rd |
| https://www.headspace.com/ | 254ms | 4ms | 0ms | 3rd |
| https://www.headspace.com/web-marketing-ssr/_next/static/chunks/e9bc471870d3795c.js | 115ms | 103ms | 1ms | 3rd |
| https://www.headspace.com/web-marketing-ssr/_next/static/chunks/3d2826b45ab622f0.js | 104ms | 94ms | 5ms | 3rd |
| https://www.headspace.com/web-marketing-ssr/_next/static/chunks/turbopack-4e420115b144d01a.js | 83ms | 83ms | 0ms | 3rd |
| https://www.headspace.com/web-marketing-ssr/_next/static/chunks/turbopack-40d0ce1de1ac4b2b.js | 78ms | 77ms | 0ms | 3rd |
DJS BundlesAction66 scripts, 339 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://cdn.amplitude.com/libs/plugin-session-replay-browser-1.25.0-min.js.gz | 131 KB | 102 KB (79%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-M92JXMV>m_auth=16iCHRn1z7748mckvKDXyw>m_preview=env-2>m_cookies_win=x | 142 KB | 67 KB (47%) | ✓ | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202405.1.0/otBannerSdk.js | 109 KB | 59 KB (54%) | ✓ | 3rd |
| https://www.headspace.com/web-marketing-ssr/_next/static/chunks/c00d49f0c10b04ae.js | 70 KB | 34 KB (49%) | ✓ | 3rd |
| https://www.headspace.com/web-marketing-ssr/_next/static/chunks/92df9b1810b1aa1b.js | 81 KB | 27 KB (34%) | ✓ | 3rd |
| https://cdn.amplitude.com/libs/analytics-browser-2.25.1-min.js.gz | 50 KB | 26 KB (53%) | ✓ | 3rd |
| https://www.headspace.com/web-marketing-ssr/_next/static/chunks/3d2826b45ab622f0.js | 63 KB | 25 KB (40%) | ✓ | 3rd |
| https://www.headspace.com/web-marketing-ssr/_next/static/chunks/966bd6c3c7d71065.js | 9 KB | — | ✓ | 3rd |
| https://www.headspace.com/web-marketing-ssr/_next/static/chunks/c9f8e538fdb0d61d.js | 9 KB | — | ✓ | 3rd |
| https://www.headspace.com/web-marketing-ssr/_next/static/chunks/19562eaf7eceffd3.js | 10 KB | — | ✓ | 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
DPage Weight InventoryAction149 resources · 3.3 MB · 339 KB savings availableFIX
~339.3 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 149 resources | 3.3 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization45 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 Loading12 fonts (255 KB)PASS
Web fonts
12
255 KB total
Render-blocking
0
of 12
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 Waterfall149 requests over 3744msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.headspace.com www.headspace.com | Other | 742ms | 61 KB | — | €4/mo | Costly |
www.headspace.com www.headspace.com | Other | 686ms | 19 KB | — | €4/mo | Costly |
www.headspace.com www.headspace.com | Other | 394ms | 39 KB | — | €2/mo | Costly |
Unattributable Unattributable | Other | 260ms | 0 KB | — | €1/mo | Costly |
www.headspace.com www.headspace.com | Other | 254ms | 64 KB | — | €1/mo | Costly |
www.headspace.com www.headspace.com | Other | 115ms | 12 KB | — | €1/mo | Optional |
www.headspace.com www.headspace.com | Other | 104ms | 63 KB | 40% | €1/mo | Optional |
www.headspace.com www.headspace.com | Other | 83ms | 5 KB | — | €0/mo | Optional |
www.headspace.com www.headspace.com | Other | 78ms | 5 KB | — | €0/mo | Optional |
These scripts may cost more than they're worth
- www.headspace.com adds 742ms and costs ~€4/month
- www.headspace.com adds 686ms and costs ~€4/month
- www.headspace.com adds 394ms and costs ~€2/month
- Unattributable adds 260ms and costs ~€1/month
- www.headspace.com adds 254ms and costs ~€1/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.headspace.com takes 742ms 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.headspace.com takes 686ms 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.headspace.com takes 394ms 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 260ms 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.headspace.com takes 254ms 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