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.
10.35 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
15.84 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
294 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.155
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
10.35 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.
17.84 s
Page Load Progression
FPage Weight BudgetAction3.0 MB transferred, 49 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
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DJS Execution CostAction2126ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.aeaweb.org/ | 541ms | 87ms | 4ms | 3rd |
| Unattributable | 456ms | 89ms | 0ms | 3rd |
| https://www.aeaweb.org/assets/ce4791d1/jquery.min.js | 428ms | 226ms | 14ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-96K6S9DJLT&cx=c>m=4e64h1h1 | 242ms | 180ms | 61ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=UA-38835597-1 | 160ms | 95ms | 47ms | 3rd |
| https://www.aeaweb.org/assets/afc4f66/javascripts/aeaweb.min.js | 130ms | 65ms | 9ms | 3rd |
| https://www.google-analytics.com/analytics.js | 90ms | 83ms | 7ms | 3rd |
| https://www.aeaweb.org/assets/bd71bc65/jquery-ui.min.js | 78ms | 44ms | 34ms | 3rd |
DJS BundlesAction12 scripts, 484 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.aeaweb.org/assets/bd71bc65/jquery-ui.min.js | 250 KB | 218 KB (88%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-96K6S9DJLT&cx=c>m=4e64h1h1 | 153 KB | 65 KB (43%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=UA-38835597-1 | 117 KB | 63 KB (54%) | ✓ | 3rd |
| https://www.aeaweb.org/assets/afc4f66/javascripts/AeaWebPluginAsset-min.js | 65 KB | 56 KB (87%) | ✓ | 3rd |
| https://www.aeaweb.org/assets/afc4f66/javascripts/aeaweb.min.js | 68 KB | 46 KB (67%) | ✓ | 3rd |
| https://www.aeaweb.org/assets/ce4791d1/jquery.min.js | 86 KB | 37 KB (44%) | ✓ | 3rd |
| https://www.aeaweb.org/assets/2be257a9/yii.js | 21 KB | — | ✗ | 3rd |
| https://use.typekit.net/egr5vhm.js | 7 KB | — | ✓ | 3rd |
| https://www.aeaweb.org/assets/dc034874/js/SecureCsrfAsset-min.js | 3 KB | — | ✓ | 3rd |
| https://www.aeaweb.org/assets/83e11b2c/js/QueClientAsset-min.js | 9 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
FPage Weight InventoryAction49 resources · 3.0 MB · 484 KB savings availableFIX
~484.5 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 49 resources | 3.0 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction9 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
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 Loading18 fonts (529 KB)PASS
Web fonts
18
529 KB total
Render-blocking
0
of 18
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
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall49 requests over 2719msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.aeaweb.org www.aeaweb.org | Other | 541ms | 41 KB | — | $7/mo | Costly |
Unattributable Unattributable | Other | 456ms | 0 KB | — | $6/mo | Costly |
www.aeaweb.org www.aeaweb.org | Other | 428ms | 86 KB | 44% | $6/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 242ms | 153 KB | 43% | $3/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 160ms | 117 KB | 54% | $2/mo | Optional |
www.aeaweb.org www.aeaweb.org | Other | 130ms | 68 KB | 67% | $2/mo | Optional |
Google Analytics www.google-analytics.com | Analytics | 90ms | 21 KB | — | $1/mo | Optional |
www.aeaweb.org www.aeaweb.org | Other | 78ms | 250 KB | 88% | $1/mo | Optional |
These scripts may cost more than they're worth
- www.aeaweb.org adds 541ms and costs ~$7/month
- Unattributable adds 456ms and costs ~$6/month
- www.aeaweb.org adds 428ms and costs ~$6/month
- Google Tag Manager adds 242ms 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.aeaweb.org takes 541ms 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 456ms 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.aeaweb.org 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 242ms 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
54% 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
67% of www.aeaweb.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
88% of www.aeaweb.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