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.
2.48 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
10.08 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
437 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.164
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
2.48 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.
11.31 s
Page Load Progression
FPage Weight BudgetAction2.7 MB transferred, 55 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
DPage Weight InventoryAction55 resources · 2.7 MB · 215 KB savings availableFIX
~215.4 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 55 resources | 2.7 MiB | ||||||
BImage Optimization26 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 CostAction1740ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtag/js?id=G-1YN7LB2WN8&cx=c>m=4e64k0 | 382ms | 303ms | 74ms | 3rd |
| Unattributable | 343ms | 18ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-PFGD5J2 | 299ms | 237ms | 59ms | 3rd |
| https://www.factcheck.org/ | 290ms | 11ms | 3ms | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=AW-1007263401&cx=c>m=4e64k0 | 247ms | 189ms | 56ms | 3rd |
| https://code.jquery.com/jquery-latest.min.js?ver=6.8.3 | 114ms | 61ms | 12ms | 3rd |
| https://www.google-analytics.com/analytics.js | 65ms | 55ms | 7ms | 3rd |
CJS BundlesAction8 scripts, 215 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtag/js?id=G-1YN7LB2WN8&cx=c>m=4e64k0 | 170 KB | 68 KB (40%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-PFGD5J2 | 156 KB | 66 KB (42%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=AW-1007263401&cx=c>m=4e64k0 | 137 KB | 61 KB (44%) | ✓ | 3rd |
| https://code.jquery.com/jquery-latest.min.js?ver=6.8.3 | 33 KB | 21 KB (64%) | ✓ | 3rd |
| https://www.factcheck.org/wp-content/plugins/duracelltomi-google-tag-manager/dist/js/analytics-talk-content-tracking.js?ver=1.22.2 | 1 KB | — | ✓ | 3rd |
| https://www.factcheck.org/wp-content/themes/understrap/js/popper.min.js?ver=6.8.3 | 7 KB | — | ✓ | 3rd |
| https://www.factcheck.org/wp-content/themes/factcheckstrap/js/child-theme.min.js?ver=1.2.3 | 20 KB | — | ✗ | 3rd |
| https://www.google-analytics.com/analytics.js | 21 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
A+Text CompressionAll text resources are compressedPASS
A+Font Loading3 fonts (184 KB)PASS
Web fonts
3
184 KB total
Render-blocking
0
of 3
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 Hints3 hints, 0 missing preconnectsPASS
Current Resource Hints
3 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: Google Cloud
AHTTP Cachingmax-age=601 (10 minutes)PASS
max-age=601
| Directive | Value | Meaning |
|---|---|---|
| max-age | 601 | Cache for 10 minutes |
Network Waterfall55 requests over 1516msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Google Tag Manager www.googletagmanager.com | Tag Manager | 382ms | 170 KB | 40% | $5/mo | Costly |
Unattributable Unattributable | Other | 343ms | 0 KB | — | $5/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 299ms | 156 KB | 42% | $4/mo | Costly |
www.factcheck.org www.factcheck.org | Other | 290ms | 14 KB | — | $4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 247ms | 137 KB | 44% | $3/mo | Costly |
code.jquery.com code.jquery.com | Other | 114ms | 33 KB | 64% | $2/mo | Optional |
Google Analytics www.google-analytics.com | Analytics | 65ms | 21 KB | — | $1/mo | Optional |
These scripts may cost more than they're worth
- Google Tag Manager adds 382ms and costs ~$5/month
- Unattributable adds 343ms and costs ~$5/month
- Google Tag Manager adds 299ms and costs ~$4/month
- www.factcheck.org adds 290ms and costs ~$4/month
- Google Tag Manager adds 247ms 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
Google Tag Manager takes 382ms 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 343ms 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 299ms 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.factcheck.org takes 290ms 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 247ms 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
64% of code.jquery.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