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.
1.96 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
16.39 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
1.60 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.000
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
7.75 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.
16.79 s
Page Load Progression
FPage Weight BudgetAction2.7 MB transferred, 131 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
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
FJS Execution CostAction11273ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.headspace.com/web-marketing-ssr/_next/static/chunks/1a0bb58acbf0b64b.js | 3089ms | 2776ms | 17ms | 3rd |
| https://www.headspace.com/web-marketing-ssr/_next/static/chunks/c15c7cf7199d6fd1.js | 2906ms | 1036ms | 4ms | 3rd |
| https://www.headspace.com/web-marketing-ssr/_next/static/chunks/d775b5b016d581e0.js | 1532ms | 244ms | 8ms | 3rd |
| Unattributable | 717ms | 41ms | 0ms | 3rd |
| https://www.headspace.com/ | 672ms | 19ms | 1ms | 3rd |
| https://www.headspace.com/web-marketing-ssr/_next/static/chunks/e9bc471870d3795c.js | 553ms | 493ms | 3ms | 3rd |
| https://www.headspace.com/web-marketing-ssr/_next/static/chunks/3d2826b45ab622f0.js | 312ms | 280ms | 31ms | 3rd |
| https://www.headspace.com/web-marketing-ssr/_next/static/chunks/turbopack-40d0ce1de1ac4b2b.js | 305ms | 304ms | 1ms | 3rd |
| https://www.headspace.com/web-marketing-ssr/_next/static/chunks/turbopack-4e420115b144d01a.js | 298ms | 296ms | 1ms | 3rd |
| https://www.headspace.com/web-marketing-ssr/_next/static/chunks/1176527437f54d87.js | 194ms | 167ms | 1ms | 3rd |
Showing top 10 of 15 scripts
DPage Weight InventoryAction131 resources · 2.7 MB · 253 KB savings availableFIX
~253.4 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 131 resources | 2.7 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization37 images, 0 KB saveableREVIEW
CJS BundlesAction65 scripts, 253 KB unusedREVIEW
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 | 100 KB (78%) | ✓ | 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://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://www.headspace.com/web-marketing-ssr/_next/static/chunks/3d2826b45ab622f0.js | 63 KB | 26 KB (41%) | ✓ | 3rd |
| https://cdn.amplitude.com/libs/analytics-browser-2.25.1-min.js.gz | 50 KB | — | ✓ | 3rd |
| https://www.headspace.com/web-marketing-ssr/_next/static/chunks/f0f817ebe65e2173.js | 19 KB | — | ✓ | 3rd |
| https://www.headspace.com/web-marketing-ssr/_next/static/chunks/1bad072c0cb99c93.js | 6 KB | — | ✓ | 3rd |
| https://www.headspace.com/web-marketing-ssr/_next/static/chunks/19562eaf7eceffd3.js | 10 KB | — | ✓ | 3rd |
| https://www.headspace.com/web-marketing-ssr/_next/static/chunks/83280180f8d2eb99.js | 18 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
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 Hints17 hints, 0 missing preconnectsPASS
Current Resource Hints
17 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall131 requests over 3488msINFO
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 | 3089ms | 61 KB | — | €16/mo | Costly |
www.headspace.com www.headspace.com | Other | 2906ms | 19 KB | — | €15/mo | Costly |
www.headspace.com www.headspace.com | Other | 1532ms | 39 KB | — | €8/mo | Costly |
Unattributable Unattributable | Other | 717ms | 0 KB | — | €4/mo | Costly |
www.headspace.com www.headspace.com | Other | 672ms | 65 KB | — | €4/mo | Costly |
www.headspace.com www.headspace.com | Other | 553ms | 12 KB | — | €3/mo | Costly |
www.headspace.com www.headspace.com | Other | 312ms | 63 KB | 41% | €2/mo | Costly |
www.headspace.com www.headspace.com | Other | 305ms | 5 KB | — | €2/mo | Costly |
www.headspace.com www.headspace.com | Other | 298ms | 5 KB | — | €2/mo | Costly |
www.headspace.com www.headspace.com | Other | 194ms | 2 KB | — | €1/mo | Optional |
www.headspace.com www.headspace.com | Other | 176ms | 5 KB | — | €1/mo | Optional |
Amplitude cdn.amplitude.com | Analytics | 174ms | 131 KB | 78% | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 161ms | 142 KB | 47% | €1/mo | Optional |
www.headspace.com www.headspace.com | Other | 95ms | 4 KB | — | €0/mo | Optional |
www.headspace.com www.headspace.com | Other | 89ms | 70 KB | 49% | €0/mo | Optional |
These scripts may cost more than they're worth
- www.headspace.com adds 3089ms and costs ~€16/month
- www.headspace.com adds 2906ms and costs ~€15/month
- www.headspace.com adds 1532ms and costs ~€8/month
- Unattributable adds 717ms and costs ~€4/month
- www.headspace.com adds 672ms and costs ~€4/month
- www.headspace.com adds 553ms and costs ~€3/month
- www.headspace.com adds 312ms and costs ~€2/month
- www.headspace.com adds 305ms and costs ~€2/month
- www.headspace.com adds 298ms and costs ~€2/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 3089ms 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 2906ms 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 1532ms 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 717ms 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 672ms 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 553ms 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 312ms 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 305ms 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 298ms 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
78% of Amplitude'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