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.
2.07 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
4.09 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
68 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.
2.47 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.
4.85 s
Page Load Progression
FPage Weight BudgetAction5.4 MB transferred, 97 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
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.
Source: web.dev
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS BundlesAction27 scripts, 1.7 MB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.recreation.gov/navigation/vendor-C0aOdRmL.js | 429 KB | 274 KB (65%) | ✓ | 3rd |
| https://www.recreation.gov/shared/libraries/mapbox-gl-2.15.0/mapbox-gl.js | 326 KB | 254 KB (79%) | ✓ | 3rd |
| https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js | 0 KB | 177 KB (49%) | ✓ | 3rd |
| https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js | 362 KB | 177 KB (49%) | ✓ | 3rd |
| https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js | 362 KB | 177 KB (49%) | ✓ | 3rd |
| https://www.recreation.gov/navigation/index-DiropKY0.js | 196 KB | 121 KB (63%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-9TNNMGP8WJ&cx=c>m=4e64k1 | 155 KB | 107 KB (69%) | ✓ | 3rd |
| https://www.recreation.gov/navigation/sarsaparilla-CtTkDZqa.js | 151 KB | 96 KB (65%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-X10C0SX7L7&cx=c>m=4e64k1 | 176 KB | 67 KB (38%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-9TNNMGP8WJ | 155 KB | 65 KB (42%) | ✓ | 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 InventoryAction97 resources · 5.4 MB · 1.7 MB savings availableFIX
~1.7 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 97 resources | 5.4 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction30 images, 0 KB saveableREVIEW
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
CJS Execution CostAction1391ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.recreation.gov/navigation/react-C0oLPbys.js | 309ms | 222ms | 0ms | 3rd |
| Unattributable | 240ms | 8ms | 0ms | 3rd |
| https://www.recreation.gov/ | 209ms | 2ms | 1ms | 3rd |
| https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js | 178ms | 157ms | 16ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-5PH9PJ3>m_auth=TTJSuH9rjmpxLfachGPS8g>m_preview=env-2>m_cookies_win=x | 131ms | 114ms | 14ms | 3rd |
| https://www.recreation.gov/navigation/vendor-C0aOdRmL.js | 115ms | 56ms | 1ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-X10C0SX7L7&cx=c>m=4e64k1 | 100ms | 88ms | 11ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-751332302&cx=c>m=4e64k1 | 57ms | 48ms | 8ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-9TNNMGP8WJ | 52ms | 43ms | 8ms | 3rd |
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 Loading4 fonts (139 KB)PASS
Web fonts
4
139 KB total
Render-blocking
0
of 4
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 Waterfall97 requests over 4087msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.recreation.gov www.recreation.gov | Other | 309ms | 57 KB | — | €3/mo | Costly |
Unattributable Unattributable | Other | 240ms | 0 KB | — | €3/mo | Costly |
www.recreation.gov www.recreation.gov | Other | 209ms | 15 KB | — | €2/mo | Costly |
www.gstatic.com www.gstatic.com | Other | 178ms | 0 KB | 49% | €2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 131ms | 182 KB | 28% | €1/mo | Optional |
www.recreation.gov www.recreation.gov | Other | 115ms | 429 KB | 65% | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 100ms | 176 KB | 38% | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 57ms | 145 KB | 42% | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 52ms | 155 KB | 42% | €1/mo | Optional |
These scripts may cost more than they're worth
- www.recreation.gov adds 309ms and costs ~€3/month
- Unattributable adds 240ms and costs ~€3/month
- www.recreation.gov adds 209ms 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.recreation.gov takes 309ms 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 240ms 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.recreation.gov takes 209ms 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
65% of www.recreation.gov'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