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.
982 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.32 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
70 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.064
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
1.40 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.
2.76 s
Page Load Progression
FPage Weight BudgetAction4.7 MB transferred, 85 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
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DJS BundlesAction15 scripts, 378 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.usccb.org/sites/default/files/js/js_uBLq_NVQx9C-L6JMQXhuteU3FFLVjpw-V6mP41Nltso.js?scope=footer&delta=0&language=en&theme=ai&include=eJxtyUEOwjAMRNELpfhI0SSeVga3RkkKlNNTsYXNfOkNTBaPAp_6ONy2JcGk1xbuBS3VG9VGtNwIXaNRfiRxzzXiZjyz3t2wVco_TFHmvVcMZq4wF-WM3Ud6mDJOK9Q8G13F8T4mD-j58dnluxdc8foAHKJFSw | 140 KB | 71 KB (51%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-E6LL2ZREPE&cx=c>m=4e64k1h1 | 172 KB | 69 KB (40%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=G-LFL81Q76LQ&l=vnwDataLayer&cx=c>m=4e64k0 | 157 KB | 68 KB (43%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-5JHPTP | 139 KB | 64 KB (46%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-MFCLMDFF&l=vnwDataLayer | 117 KB | 62 KB (53%) | ✓ | 3rd |
| https://connect.facebook.net/en_US/fbevents.js | 97 KB | 44 KB (46%) | ✓ | 3rd |
| https://www.vaticannews.va/etc/designs/vatican-news/release/library/widget/js/widget.js | 4 KB | — | ✓ | 3rd |
| https://www.google-analytics.com/analytics.js | 21 KB | — | ✓ | 3rd |
| https://www.vaticannews.va/etc/designs/vatican-news/release/library/widget/js/bootstrap.bundle.min.js | 23 KB | — | ✓ | 3rd |
| https://static.ads-twitter.com/uwt.js | 13 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 InventoryAction85 resources · 4.7 MB · 378 KB savings availableFIX
~378.2 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 85 resources | 4.7 MiB | ||||||
CImage OptimizationAction47 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
CJS Execution CostAction1337ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.usccb.org/sites/default/files/js/js_uBLq_NVQx9C-L6JMQXhuteU3FFLVjpw-V6mP41Nltso.js?scope=footer&delta=0&language=en&theme=ai&include=eJxtyUEOwjAMRNELpfhI0SSeVga3RkkKlNNTsYXNfOkNTBaPAp_6ONy2JcGk1xbuBS3VG9VGtNwIXaNRfiRxzzXiZjyz3t2wVco_TFHmvVcMZq4wF-WM3Ud6mDJOK9Q8G13F8T4mD-j58dnluxdc8foAHKJFSw | 490ms | 251ms | 20ms | 3rd |
| https://www.usccb.org/ | 257ms | 15ms | 1ms | 3rd |
| Unattributable | 171ms | 4ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-E6LL2ZREPE&cx=c>m=4e64k1h1 | 117ms | 94ms | 21ms | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=G-LFL81Q76LQ&l=vnwDataLayer&cx=c>m=4e64k0 | 100ms | 80ms | 19ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-5JHPTP | 95ms | 76ms | 17ms | 3rd |
| https://connect.facebook.net/en_US/fbevents.js | 55ms | 39ms | 15ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-MFCLMDFF&l=vnwDataLayer | 51ms | 37ms | 13ms | 3rd |
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 Loading6 fonts (99 KB)PASS
Web fonts
6
99 KB total
Render-blocking
0
of 6
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Convert to woff2 for ~30% smaller file size
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 ~3 KB and ~6 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
AHTTP Cachingmax-age=86400 (1 day)PASS
public, max-age=86400
| Directive | Value | Meaning |
|---|---|---|
| public | — | Any cache may store this response |
| max-age | 86400 | Cache for 1 day |
Network Waterfall85 requests over 1534msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.usccb.org www.usccb.org | Other | 490ms | 140 KB | 51% | €5/mo | Costly |
www.usccb.org www.usccb.org | Other | 257ms | 19 KB | — | €3/mo | Costly |
Unattributable Unattributable | Other | 171ms | 0 KB | — | €2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 117ms | 172 KB | 40% | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 100ms | 157 KB | 43% | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 95ms | 139 KB | 46% | €1/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 55ms | 97 KB | 46% | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 51ms | 117 KB | 53% | €1/mo | Optional |
These scripts may cost more than they're worth
- www.usccb.org adds 490ms and costs ~€5/month
- www.usccb.org adds 257ms 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.usccb.org takes 490ms 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 www.usccb.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.usccb.org takes 257ms 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
53% 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