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.
2.31 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
9.83 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
1.15 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.007
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
3.12 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.
24.47 s
Page Load Progression
FPage Weight BudgetAction6.2 MB transferred, 121 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
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 ImpactAction75% third-party, 0 ms blockingFIX
FJS Execution CostAction4241ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://carnegieendowment.org/_next/static/chunks/01_.lpw29n_h0.js | 849ms | 787ms | 27ms | 1st |
| https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js | 722ms | 601ms | 97ms | 3rd |
| https://carnegieendowment.org/ | 537ms | 27ms | 26ms | 1st |
| Unattributable | 459ms | 26ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-D7D6JHFTGH&cx=c>m=4e64h1 | 428ms | 315ms | 41ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-6VNRN5Y458&cx=c>m=4e64h1 | 341ms | 286ms | 51ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-5ZQP7QS | 280ms | 215ms | 50ms | 3rd |
| https://carnegieendowment.org/_next/static/chunks/0w67m.cv0j35l.js | 274ms | 149ms | 24ms | 1st |
| https://www.googletagmanager.com/gtag/destination?id=AW-1052530778&cx=c>m=4e64h1 | 204ms | 170ms | 32ms | 3rd |
| https://carnegieendowment.org/_next/static/chunks/0ju65q5daolwk.js | 147ms | 142ms | 5ms | 1st |
FJS BundlesAction39 scripts, 1.2 MB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://carnegieendowment.org/_next/static/chunks/0.-thvecb5ueo.js | 229 KB | 188 KB (82%) | ✓ | 1st |
| 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://carnegieendowment.org/_next/static/chunks/09zb.x9m.qzvs.js | 82 KB | 81 KB (100%) | ✓ | 1st |
| https://www.googletagmanager.com/gtm.js?id=GTM-5ZQP7QS | 157 KB | 79 KB (51%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-6VNRN5Y458&cx=c>m=4e64h1 | 176 KB | 69 KB (39%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=AW-1052530778&cx=c>m=4e64h1 | 137 KB | 61 KB (45%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-D7D6JHFTGH&cx=c>m=4e64h1 | 170 KB | 59 KB (35%) | ✓ | 3rd |
| https://carnegieendowment.org/_next/static/chunks/10-yu1u9v0.w_.js | 61 KB | 59 KB (97%) | ✓ | 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
FPage Weight InventoryAction121 resources · 6.2 MB · 1.2 MB savings availableFIX
~1.2 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 121 resources | 6.2 MiB | ||||||
BImage Optimization22 images, 0 KB saveableREVIEW
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
BHTTP Cachings-maxage=300, stale-while-revalidate=31535700REVIEW
s-maxage=300, stale-while-revalidate=31535700
| Directive | Value | Meaning |
|---|---|---|
| s-maxage | 300 | CDN caches for 5 minutes |
| stale-while-revalidate | 31535700 | Serve stale for 52 weeks while fetching fresh |
A+Text CompressionAll text resources are compressedPASS
A+Font Loading16 fonts (523 KB)PASS
Web fonts
16
523 KB total
Render-blocking
0
of 16
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 Hints13 hints, 0 missing preconnectsPASS
Current Resource Hints
13 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall121 requests over 1788msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.gstatic.com www.gstatic.com | Other | 722ms | 0 KB | 49% | €8/mo | Costly |
Unattributable Unattributable | Other | 459ms | 0 KB | — | €5/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 428ms | 170 KB | 35% | €5/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 341ms | 176 KB | 39% | €4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 280ms | 157 KB | 51% | €3/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 204ms | 137 KB | 45% | €2/mo | Costly |
These scripts may cost more than they're worth
- www.gstatic.com adds 722ms and costs ~€8/month
- Unattributable adds 459ms and costs ~€5/month
- Google Tag Manager adds 428ms and costs ~€5/month
- Google Tag Manager adds 341ms and costs ~€4/month
- Google Tag Manager adds 280ms and costs ~€3/month
- Google Tag Manager adds 204ms and costs ~€2/month
57% of JavaScript execution time comes from third-party scripts.
Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.
Learn more ▾ ▴
Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.
Source: web.dev / HTTP Archive Web Almanac
www.gstatic.com takes 722ms 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 459ms 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 428ms 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 341ms 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 280ms 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
51% 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
Google Tag Manager takes 204ms 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