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.
842 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.45 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
102 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.065
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
895 ms
Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.
2.77 s
Page Load Progression
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DJS BundlesAction31 scripts, 325 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtm.js?id=GTM-P3K3QB | 170 KB | 67 KB (39%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-HVJ4FGFQTL&cx=c&_slc=1 | 149 KB | 61 KB (41%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=AW-699818781&cx=c>m=4e64k1h2 | 138 KB | 60 KB (43%) | ✓ | 3rd |
| https://themuse-renderer.vercel.app/_next/static/chunks/13-cdc5f09203cc5880.js?dpl=dpl_E8YCzWew3D3mWkgSDYwPuH6R55gf | 84 KB | 44 KB (53%) | ✓ | 3rd |
| https://themuse-renderer.vercel.app/_next/static/chunks/1985-9c33629eb11e616b.js?dpl=dpl_E8YCzWew3D3mWkgSDYwPuH6R55gf | 54 KB | 40 KB (75%) | ✓ | 3rd |
| https://themuse-renderer.vercel.app/_next/static/chunks/1409-e58039b54f182182.js?dpl=dpl_E8YCzWew3D3mWkgSDYwPuH6R55gf | 62 KB | 27 KB (43%) | ✓ | 3rd |
| https://themuse-renderer.vercel.app/_next/static/chunks/5144-1d4b3a21bb1ac71e.js?dpl=dpl_E8YCzWew3D3mWkgSDYwPuH6R55gf | 58 KB | 25 KB (44%) | ✓ | 3rd |
| https://themuse-renderer.vercel.app/_next/static/chunks/9362-6174298785229294.js?dpl=dpl_E8YCzWew3D3mWkgSDYwPuH6R55gf | 11 KB | — | ✓ | 3rd |
| https://themuse-renderer.vercel.app/_next/static/chunks/1060-b52eea41634e81a2.js?dpl=dpl_E8YCzWew3D3mWkgSDYwPuH6R55gf | 5 KB | — | ✓ | 3rd |
| https://themuse-renderer.vercel.app/_next/static/chunks/4103-0113b625b23f227c.js?dpl=dpl_E8YCzWew3D3mWkgSDYwPuH6R55gf | 4 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 InventoryAction94 resources · 1.4 MB · 325 KB savings availableFIX
~324.5 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 94 resources | 1.4 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BPage Weight Budget1.4 MB transferred, 94 requestsREVIEW
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
CJS Execution CostAction1868ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://themuse-renderer.vercel.app/_next/static/chunks/4079-f47e719e5c7c38a5.js?dpl=dpl_E8YCzWew3D3mWkgSDYwPuH6R55gf | 1062ms | 816ms | 8ms | 3rd |
| https://www.themuse.com/ | 168ms | 10ms | 5ms | 3rd |
| Unattributable | 168ms | 11ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-P3K3QB | 151ms | 124ms | 20ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-HVJ4FGFQTL&cx=c&_slc=1 | 98ms | 82ms | 15ms | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=AW-699818781&cx=c>m=4e64k1h2 | 74ms | 59ms | 15ms | 3rd |
| https://themuse-renderer.vercel.app/_next/static/chunks/5263-3fdbb4055a5f88fd.js?dpl=dpl_E8YCzWew3D3mWkgSDYwPuH6R55gf | 74ms | 73ms | 1ms | 3rd |
| https://themuse-renderer.vercel.app/_next/static/chunks/7eeef67d-82a5c25b638cfadd.js?dpl=dpl_E8YCzWew3D3mWkgSDYwPuH6R55gf | 72ms | 63ms | 6ms | 3rd |
A+Text CompressionAll text resources are compressedPASS
AImage Optimization25 images, 0 KB saveablePASS
A+Font Loading3 fonts (62 KB)PASS
Web fonts
3
62 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
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
Network Waterfall94 requests over 3113msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
themuse-renderer.vercel.app themuse-renderer.vercel.app | Other | 1062ms | 45 KB | — | €17/mo | Costly |
www.themuse.com www.themuse.com | Other | 168ms | 28 KB | — | €3/mo | Optional |
Unattributable Unattributable | Other | 168ms | 0 KB | — | €3/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 151ms | 170 KB | 39% | €2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 98ms | 149 KB | 41% | €2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 74ms | 138 KB | 43% | €1/mo | Optional |
themuse-renderer.vercel.app themuse-renderer.vercel.app | Other | 74ms | 9 KB | — | €1/mo | Optional |
themuse-renderer.vercel.app themuse-renderer.vercel.app | Other | 72ms | 54 KB | — | €1/mo | Optional |
These scripts may cost more than they're worth
- themuse-renderer.vercel.app adds 1062ms and costs ~€17/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
themuse-renderer.vercel.app takes 1062ms 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