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.
1.54 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
18.45 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
912 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.019
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
4.55 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.
18.45 s
Page Load Progression
572 ms
1.1 s
1.7 s
2.3 s 2.9 s
3.4 s
4.0 s
4.6 sFPage Weight BudgetAction24.0 MB transferred, 133 requestsFIX
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
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
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
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
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
DJS Execution CostAction2871ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.nationalgeographic.org/wp-content/plugins/fundor-core/assets/js/libs/TweenMax.min.js?ver=1.0.8 | 1029ms | 21ms | 9ms | 3rd |
| https://www.nationalgeographic.org/society/ | 681ms | 14ms | 4ms | 3rd |
| Unattributable | 385ms | 3ms | 0ms | 3rd |
| https://www.nationalgeographic.org/wp-includes/js/jquery/jquery.min.js?ver=3.7.1 | 274ms | 188ms | 2ms | 3rd |
| https://cmp.osano.com/16CTtkTpkevwz37Ll/2d76ede4-75b8-4f8a-9115-6a8e911ef782/osano.js | 197ms | 178ms | 9ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-5GDQ9F | 165ms | 114ms | 14ms | 3rd |
| https://www.nationalgeographic.org/wp-content/plugins/revslider/public/assets/js/rbtools.min.js?ver=6.5.3 | 83ms | 15ms | 3ms | 3rd |
| https://www.nationalgeographic.org/wp-content/plugins/superfly-menu/js/public.min.js?ver=5.0.22 | 59ms | 47ms | 2ms | 3rd |
DJS BundlesAction57 scripts, 377 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.nationalgeographic.org/wp-content/plugins/revslider/public/assets/js/rs6.min.js?ver=6.5.3 | 96 KB | 93 KB (97%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-5GDQ9F | 181 KB | 79 KB (44%) | ✓ | 3rd |
| https://cdn.jsdelivr.net/npm/instantsearch.js@4.69.0/dist/instantsearch.production.min.js?ver=0.1.0 | 81 KB | 74 KB (92%) | ✓ | 3rd |
| https://www.nationalgeographic.org/wp-content/plugins/revslider/public/assets/js/rbtools.min.js?ver=6.5.3 | 48 KB | 31 KB (65%) | ✓ | 3rd |
| https://www.nationalgeographic.org/wp-content/plugins/fundor-core/assets/js/libs/TweenMax.min.js?ver=1.0.8 | 39 KB | 30 KB (77%) | ✓ | 3rd |
| https://cmp.osano.com/16CTtkTpkevwz37Ll/2d76ede4-75b8-4f8a-9115-6a8e911ef782/osano.js | 80 KB | 24 KB (30%) | ✓ | 3rd |
| https://cdp.nationalgeographic.org/script.js | 41 KB | 23 KB (57%) | ✓ | 3rd |
| https://www.nationalgeographic.org/wp-content/plugins/elementor-pro/assets/js/preloaded-elements-handlers.min.js?ver=3.4.1 | 28 KB | 23 KB (83%) | ✓ | 3rd |
| https://www.nationalgeographic.org/wp-content/plugins/elementor/assets/lib/jquery-numerator/jquery-numerator.min.js?ver=0.2.1 | 1 KB | — | ✓ | 3rd |
| https://www.nationalgeographic.org/wp-content/plugins/ngs-search-with-algolia/js/algolia-stats.js?ver=0.1.0 | 1 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 InventoryAction133 resources · 24.0 MB · 377 KB savings availableFIX
~376.7 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 133 resources | 24.0 MiB | ||||||
CImage OptimizationAction28 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 Loading11 fonts (604 KB)PASS
Web fonts
11
604 KB total
Render-blocking
0
of 11
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Convert to woff2 for ~30% smaller file size
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
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)
Fixing the unchecked items could save ~113 KB and ~226 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
AHTTP Cachingmax-age=600 (10 minutes)PASS
max-age=600, must-revalidate
| Directive | Value | Meaning |
|---|---|---|
| max-age | 600 | Cache for 10 minutes |
| must-revalidate | — | Must recheck with server after expiry |
Network Waterfall133 requests over 4032msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.nationalgeographic.org www.nationalgeographic.org | Other | 1029ms | 39 KB | 77% | €11/mo | Costly |
www.nationalgeographic.org www.nationalgeographic.org | Other | 681ms | 105 KB | — | €7/mo | Costly |
Unattributable Unattributable | Other | 385ms | 0 KB | — | €4/mo | Costly |
www.nationalgeographic.org www.nationalgeographic.org | Other | 274ms | 31 KB | — | €3/mo | Costly |
cmp.osano.com cmp.osano.com | Other | 197ms | 80 KB | 30% | €2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 165ms | 181 KB | 44% | €2/mo | Optional |
www.nationalgeographic.org www.nationalgeographic.org | Other | 83ms | 48 KB | 65% | €1/mo | Optional |
www.nationalgeographic.org www.nationalgeographic.org | Other | 59ms | 23 KB | — | €1/mo | Optional |
These scripts may cost more than they're worth
- www.nationalgeographic.org adds 1029ms and costs ~€11/month
- www.nationalgeographic.org adds 681ms and costs ~€7/month
- Unattributable adds 385ms and costs ~€4/month
- www.nationalgeographic.org adds 274ms and costs ~€3/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.nationalgeographic.org takes 1029ms 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
77% of www.nationalgeographic.org'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.nationalgeographic.org takes 681ms 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 385ms 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.nationalgeographic.org takes 274ms 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.nationalgeographic.org'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