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.
5.38 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
11.63 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
463 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.001
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
6.29 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.
11.71 s
Page Load Progression
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DJS BundlesAction20 scripts, 469 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://d3rse9xjbp8270.cloudfront.net/at.js | 270 KB | 195 KB (72%) | ✓ | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604170101/pubads_impl.js?cb=31097946 | 187 KB | 144 KB (77%) | ✓ | 3rd |
| https://www.nea.org/themes/custom/locker/storybook/dist/js/index-generated.js?tdlkp0 | 107 KB | 77 KB (72%) | ✓ | 3rd |
| https://monsido-consent.com/v1/assets/cookie-banner-modern.min.js | 69 KB | 28 KB (40%) | ✓ | 3rd |
| https://js.verygoodvault.com/vgs-collect/2.18.4/vgs-collect.js | 44 KB | 26 KB (61%) | ✓ | 3rd |
| https://www.nea.org/sites/default/files/js/js_CMeZx5zEt6gu-MZtR8quCn5YrBYHlWEvAmVUkUqFfCo.js?scope=footer&delta=4&language=en&theme=locker&include=eJx1ilEKgDAMxS4k7kijdg8ddq2sFTy-ogj--JUEgiOk6ppK3zeSEU8OYryip1lsInlrsYZBQbmZei2WPp75IjRyI6UZ_ffzoKgelf1eHNR5SQ8y7WFsbRMETl3MPSI | 0 KB | — | ✓ | 3rd |
| https://app-script.monsido.com/v2/monsido-script.js | 4 KB | — | ✓ | 3rd |
| https://www.nea.org/modules/custom/nea_suite/modules/nea_monsido/js/ga-and-ads-consent.js?tdlkp0 | 2 KB | — | ✓ | 3rd |
| https://monsido-consent.com/v1/mcm.js | 1 KB | — | ✓ | 3rd |
| https://securepubads.g.doubleclick.net/tag/js/gpt.js | 34 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 InventoryAction54 resources · 1.3 MB · 469 KB savings availableFIX
~469.5 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 54 resources | 1.3 MiB | ||||||
BPage Weight Budget1.3 MB transferred, 54 requestsREVIEW
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
CImage OptimizationAction7 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
CJS Execution CostAction1981ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.nea.org/ | 494ms | 3ms | 0ms | 3rd |
| https://d3rse9xjbp8270.cloudfront.net/at.js | 288ms | 204ms | 68ms | 3rd |
| https://www.nea.org/themes/custom/locker/storybook/dist/js/index-generated.js?tdlkp0 | 271ms | 107ms | 29ms | 3rd |
| Unattributable | 227ms | 7ms | 0ms | 3rd |
| https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516 | 172ms | 158ms | 2ms | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604170101/pubads_impl.js?cb=31097946 | 165ms | 107ms | 49ms | 3rd |
| https://monsido-consent.com/v1/assets/cookie-banner-modern.min.js | 154ms | 103ms | 24ms | 3rd |
| https://www.nea.org/sites/default/files/js/js_mamgJNq1w4QlPGcZE0FL7d6B_tu0pd7weUcRyNd7cOw.js?scope=footer&delta=0&language=en&theme=locker&include=eJx1ilEKgDAMxS4k7kijdg8ddq2sFTy-ogj--JUEgiOk6ppK3zeSEU8OYryip1lsInlrsYZBQbmZei2WPp75IjRyI6UZ_ffzoKgelf1eHNR5SQ8y7WFsbRMETl3MPSI | 81ms | 58ms | 11ms | 3rd |
| https://securepubads.g.doubleclick.net/tag/js/gpt.js | 76ms | 67ms | 9ms | 3rd |
| https://js.verygoodvault.com/vgs-collect/2.18.4/vgs-collect.js | 52ms | 39ms | 13ms | 3rd |
A+Text CompressionAll text resources are compressedPASS
A+Font Loading7 fonts (210 KB)PASS
Web fonts
7
210 KB total
Render-blocking
0
of 7
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 Hints2 hints, 0 missing preconnectsPASS
Current Resource Hints
2 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
AHTTP Cachingmax-age=31536000 (52 weeks)PASS
max-age=31536000
| Directive | Value | Meaning |
|---|---|---|
| max-age | 31536000 | Cache for 52 weeks |
Network Waterfall54 requests over 2722msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.nea.org www.nea.org | Other | 494ms | 23 KB | — | €5/mo | Costly |
d3rse9xjbp8270.cloudfront.net d3rse9xjbp8270.cloudfront.net | Other | 288ms | 270 KB | 72% | €3/mo | Costly |
www.nea.org www.nea.org | Other | 271ms | 107 KB | 72% | €3/mo | Costly |
Unattributable Unattributable | Other | 227ms | 0 KB | — | €2/mo | Costly |
static.cloudflareinsights.com static.cloudflareinsights.com | Other | 172ms | 11 KB | — | €2/mo | Optional |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 165ms | 187 KB | 77% | €2/mo | Optional |
monsido-consent.com monsido-consent.com | Other | 154ms | 69 KB | 40% | €2/mo | Optional |
www.nea.org www.nea.org | Other | 81ms | 34 KB | — | €1/mo | Optional |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 76ms | 34 KB | — | €1/mo | Optional |
js.verygoodvault.com js.verygoodvault.com | Other | 52ms | 44 KB | 61% | €1/mo | Optional |
These scripts may cost more than they're worth
- www.nea.org adds 494ms and costs ~€5/month
- d3rse9xjbp8270.cloudfront.net adds 288ms and costs ~€3/month
- www.nea.org adds 271ms and costs ~€3/month
- Unattributable adds 227ms 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.nea.org takes 494ms 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
d3rse9xjbp8270.cloudfront.net takes 288ms 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
72% of d3rse9xjbp8270.cloudfront.net'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.nea.org takes 271ms 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
72% of www.nea.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
Unattributable takes 227ms 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 securepubads.g.doubleclick.net'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
61% of js.verygoodvault.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