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.
1.14 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
3.03 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
210 ms
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.
1.14 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.
4.79 s
Page Load Progression
DJS BundlesAction28 scripts, 482 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://nodejs.org/_next/static/chunks/e9d0cfeb00640e51.js?dpl=dpl_5arqrKXBryHXqnLyRCqHzniv24Bf | 171 KB | 170 KB (100%) | ✓ | 1st |
| https://nodejs.org/_next/static/chunks/2d10c11186cd6f39.js?dpl=dpl_5arqrKXBryHXqnLyRCqHzniv24Bf | 170 KB | 166 KB (98%) | ✓ | 1st |
| https://nodejs.org/_next/static/chunks/faccbf520c4f877e.js?dpl=dpl_5arqrKXBryHXqnLyRCqHzniv24Bf | 37 KB | 34 KB (93%) | ✓ | 1st |
| https://nodejs.org/_next/static/chunks/629d1346574f1489.js?dpl=dpl_5arqrKXBryHXqnLyRCqHzniv24Bf | 23 KB | 23 KB (100%) | ✓ | 1st |
| https://nodejs.org/_next/static/chunks/4384b6854bb936e5.js?dpl=dpl_5arqrKXBryHXqnLyRCqHzniv24Bf | 23 KB | 23 KB (100%) | ✓ | 1st |
| https://nodejs.org/_next/static/chunks/03c3407ab62e8680.js?dpl=dpl_5arqrKXBryHXqnLyRCqHzniv24Bf | 23 KB | 22 KB (99%) | ✓ | 1st |
| https://nodejs.org/_next/static/chunks/b4210bbee67e980d.js?dpl=dpl_5arqrKXBryHXqnLyRCqHzniv24Bf | 23 KB | 22 KB (99%) | ✓ | 1st |
| https://nodejs.org/_next/static/chunks/398a835afce89113.js?dpl=dpl_5arqrKXBryHXqnLyRCqHzniv24Bf | 70 KB | 22 KB (32%) | ✓ | 1st |
| https://nodejs.org/_next/static/chunks/104afa8e47369cad.js?dpl=dpl_5arqrKXBryHXqnLyRCqHzniv24Bf | 5 KB | — | ✓ | 1st |
| https://nodejs.org/_next/static/chunks/0f864c1755afa2c5.js?dpl=dpl_5arqrKXBryHXqnLyRCqHzniv24Bf | 9 KB | — | ✓ | 1st |
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
CJS Execution CostAction1386ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://nodejs.org/_next/static/chunks/398a835afce89113.js?dpl=dpl_5arqrKXBryHXqnLyRCqHzniv24Bf | 564ms | 535ms | 19ms | 1st |
| https://nodejs.org/en | 340ms | 49ms | 81ms | 1st |
| Unattributable | 215ms | 14ms | 0ms | 3rd |
| https://nodejs.org/_next/static/chunks/042b2aa205b303f5.js?dpl=dpl_5arqrKXBryHXqnLyRCqHzniv24Bf | 159ms | 72ms | 13ms | 1st |
| https://nodejs.org/_next/static/chunks/2d10c11186cd6f39.js?dpl=dpl_5arqrKXBryHXqnLyRCqHzniv24Bf | 55ms | 2ms | 50ms | 1st |
| https://nodejs.org/_next/static/chunks/e9d0cfeb00640e51.js?dpl=dpl_5arqrKXBryHXqnLyRCqHzniv24Bf | 54ms | 1ms | 52ms | 1st |
BHTTP Cachingpublic, max-age=0, must-revalidateREVIEW
public, max-age=0, must-revalidate
| Directive | Value | Meaning |
|---|---|---|
| public | — | Any cache may store this response |
| max-age | 0 | Cache for 0 seconds |
| must-revalidate | — | Must recheck with server after expiry |
APage Weight Budget1023 KB transferred, 47 requestsPASS
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
A+Third-Party ImpactNo third-party resourcesPASS
A+Text CompressionAll text resources are compressedPASS
A+Image OptimizationNo images on this pagePASS
A+Font Loading2 fonts (33 KB)PASS
Web fonts
2
33 KB total
Render-blocking
0
of 2
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 Hints3 hints, 0 missing preconnectsPASS
Current Resource Hints
3 resource hints configured
APage Weight Inventory47 resources · 1023 KB · 482 KB savings availablePASS
~482.3 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 47 resources | 1023.3 KiB | ||||||
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
Network Waterfall47 requests over 606msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 215ms | 0 KB | — | £2/mo | Costly |
These scripts may cost more than they're worth
- Unattributable adds 215ms and costs ~£2/month
Unattributable takes 215ms 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