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.
9.08 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
16.36 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
932 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.
9.08 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.
30.01 s
Page Load Progression
FPage Weight BudgetAction5.3 MB transferred, 87 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 Execution CostAction5061ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.recreation.gov/navigation/react-C0oLPbys.js | 970ms | 671ms | 1ms | 3rd |
| Unattributable | 715ms | 13ms | 0ms | 3rd |
| https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js | 628ms | 540ms | 70ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-5PH9PJ3>m_auth=TTJSuH9rjmpxLfachGPS8g>m_preview=env-2>m_cookies_win=x | 538ms | 423ms | 59ms | 3rd |
| https://www.recreation.gov/navigation/vendor-C0aOdRmL.js | 501ms | 209ms | 5ms | 3rd |
| https://www.recreation.gov/ | 470ms | 8ms | 2ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-X10C0SX7L7&cx=c>m=4e64k1h1 | 278ms | 236ms | 39ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-9TNNMGP8WJ | 244ms | 200ms | 37ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-751332302&cx=c>m=4e64k1h1 | 219ms | 184ms | 34ms | 3rd |
| https://www.recreation.gov/shared/libraries/mapbox-gl-2.15.0/mapbox-gl.js | 155ms | 71ms | 82ms | 3rd |
Showing top 10 of 14 scripts
FJS BundlesAction22 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 | 430 KB | 274 KB (65%) | ✓ | 3rd |
| https://www.recreation.gov/shared/libraries/mapbox-gl-2.15.0/mapbox-gl.js | 326 KB | 255 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 | 122 KB (63%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-9TNNMGP8WJ&cx=c>m=4e64k1h1 | 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=4e64k1h1 | 176 KB | 67 KB (38%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-9TNNMGP8WJ | 155 KB | 64 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 InventoryAction87 resources · 5.3 MB · 1.7 MB savings availableFIX
~1.7 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 87 resources | 5.3 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction29 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
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 Loading3 fonts (126 KB)PASS
Web fonts
3
126 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 Hints1 hints, 0 missing preconnectsPASS
Current Resource Hints
1 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall87 requests over 3916msINFO
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 | 970ms | 57 KB | — | €11/mo | Costly |
Unattributable Unattributable | Other | 715ms | 0 KB | — | €8/mo | Costly |
www.gstatic.com www.gstatic.com | Other | 628ms | 0 KB | 49% | €7/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 538ms | 182 KB | 29% | €6/mo | Costly |
www.recreation.gov www.recreation.gov | Other | 501ms | 430 KB | 65% | €5/mo | Costly |
www.recreation.gov www.recreation.gov | Other | 470ms | 15 KB | — | €5/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 278ms | 176 KB | 38% | €3/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 244ms | 155 KB | 42% | €3/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 219ms | 145 KB | 42% | €2/mo | Costly |
www.recreation.gov www.recreation.gov | Other | 155ms | 326 KB | 79% | €2/mo | Optional |
Hotjar script.hotjar.com | Session Replay | 149ms | 57 KB | 65% | €2/mo | Optional |
resources.digital-cloud-gov.medallia.com resources.digital-cloud-gov.medallia.com | Other | 71ms | 72 KB | 64% | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 66ms | 155 KB | 69% | €1/mo | Optional |
dap.digitalgov.gov dap.digitalgov.gov | Other | 58ms | 4 KB | — | €1/mo | Optional |
These scripts may cost more than they're worth
- www.recreation.gov adds 970ms and costs ~€11/month
- Unattributable adds 715ms and costs ~€8/month
- www.gstatic.com adds 628ms and costs ~€7/month
- Google Tag Manager adds 538ms and costs ~€6/month
- www.recreation.gov adds 501ms and costs ~€5/month
- www.recreation.gov adds 470ms and costs ~€5/month
- Google Tag Manager adds 278ms and costs ~€3/month
- Google Tag Manager adds 244ms and costs ~€3/month
- Google Tag Manager adds 219ms 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 970ms 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 715ms 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.gstatic.com takes 628ms 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
Google Tag Manager takes 538ms 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 501ms 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
www.recreation.gov takes 470ms 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
Google Tag Manager takes 278ms 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
Google Tag Manager takes 244ms 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
Google Tag Manager takes 219ms 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
79% 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
65% of Hotjar'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
64% of resources.digital-cloud-gov.medallia.com'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
69% of Google Tag Manager'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