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.
1.33 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.94 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
0 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.
1.87 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.
3.03 s
Page Load Progression
FPage Weight BudgetAction17.8 MB transferred, 50 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
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
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DPage Weight InventoryAction50 resources · 17.8 MB · 112 KB savings availableFIX
~112.3 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 50 resources | 17.8 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization10 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
CJS Execution CostAction1094ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://global.sil.org/ | 491ms | 86ms | 4ms | 3rd |
| Unattributable | 345ms | 3ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-NP2NCPNH1G | 93ms | 71ms | 22ms | 3rd |
| https://global.sil.org/wp-includes/js/jquery/jquery.min.js?ver=3.7.1 | 86ms | 17ms | 3ms | 3rd |
| https://global.sil.org/cdn-cgi/challenge-platform/scripts/jsd/main.js | 78ms | 71ms | 1ms | 3rd |
BJS Bundles15 scripts, 112 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtag/js?id=G-NP2NCPNH1G | 144 KB | 60 KB (42%) | ✓ | 3rd |
| https://giving.classy.org/embedded/api/sdk/js/84192 | 80 KB | 53 KB (66%) | ✓ | 3rd |
| https://global.sil.org/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.4.1 | 5 KB | — | ✓ | 3rd |
| https://global.sil.org/wp-content/plugins/google-analytics-premium/pro/assets/js/privacy-guard.min.js | 1 KB | — | ✓ | 3rd |
| https://global.sil.org/wp-content/plugins/simple-banner/simple-banner.js?ver=3.2.1 | 2 KB | — | ✓ | 3rd |
| https://global.sil.org/wp-content/themes/blocksy/static/bundle/main.js?ver=2.1.38 | 10 KB | — | ✓ | 3rd |
| https://global.sil.org/wp-content/plugins/stackable-ultimate-gutenberg-blocks-premium/dist/frontend_block_tabs.js?ver=3.19.7 | 1 KB | — | ✓ | 3rd |
| https://global.sil.org/wp-content/plugins/stackable-ultimate-gutenberg-blocks-premium/dist/frontend_block_count_up.js?ver=3.19.7 | 1 KB | — | ✓ | 3rd |
| https://global.sil.org/wp-content/plugins/google-analytics-premium/assets/js/frontend-gtag.min.js?ver=10.0.2 | 3 KB | — | ✓ | 3rd |
| https://global.sil.org/wp-includes/js/jquery/jquery.min.js?ver=3.7.1 | 31 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
A+Text CompressionAll text resources are compressedPASS
A+Font Loading6 fonts (234 KB)PASS
Web fonts
6
234 KB total
Render-blocking
0
of 6
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+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
Network Waterfall50 requests over 1781msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
global.sil.org global.sil.org | Other | 491ms | 53 KB | — | $7/mo | Costly |
Unattributable Unattributable | Other | 345ms | 0 KB | — | $5/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 93ms | 144 KB | 42% | $1/mo | Optional |
global.sil.org global.sil.org | Other | 86ms | 31 KB | — | $1/mo | Optional |
global.sil.org global.sil.org | Other | 78ms | 0 KB | — | $1/mo | Optional |
These scripts may cost more than they're worth
- global.sil.org adds 491ms and costs ~$7/month
- Unattributable adds 345ms and costs ~$5/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
global.sil.org takes 491ms 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 345ms 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