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.
7.32 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
39.49 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
625 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.756
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
9.48 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.
41.52 s
Page Load Progression
FPage Weight BudgetAction9.4 MB transferred, 91 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
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DJS Execution CostAction3499ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://code.jquery.com/jquery-3.2.1.min.js | 840ms | 389ms | 6ms | 3rd |
| Unattributable | 691ms | 92ms | 0ms | 3rd |
| https://www.cjr.org/ | 564ms | 78ms | 22ms | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604200101/pubads_impl.js?cb=31097964 | 439ms | 344ms | 51ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-8FET82CL2M | 232ms | 172ms | 57ms | 3rd |
| https://pagead2.googlesyndication.com/pagead/managed/js/activeview/current/ufs_web_display.js | 205ms | 155ms | 16ms | 3rd |
| https://sdk.mrf.io/statics/marfeel-sdk.js?id=7206 | 194ms | 110ms | 1ms | 3rd |
| https://www.cjr.org/cdn-cgi/challenge-platform/scripts/jsd/main.js | 161ms | 153ms | 2ms | 3rd |
| https://www.googletagservices.com/tag/js/gpt.js | 69ms | 59ms | 10ms | 3rd |
| https://www.cjr.org/wp-content/uploads/matomo/matomo.js | 53ms | 38ms | 10ms | 3rd |
Showing top 10 of 11 scripts
DJS BundlesAction20 scripts, 259 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604200101/pubads_impl.js?cb=31097964 | 188 KB | 103 KB (55%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-8FET82CL2M | 151 KB | 65 KB (43%) | ✓ | 3rd |
| https://www.cjr.org/wp-includes/js/jquery/jquery.js?ver=3.7.1 | 84 KB | 59 KB (71%) | ✗ | 3rd |
| https://pagead2.googlesyndication.com/pagead/managed/js/activeview/current/ufs_web_display.js | 73 KB | 32 KB (43%) | ✓ | 3rd |
| https://www.cjr.org/wp-content/themes/cjr2017/_resources2017/js/slick.min.js | 11 KB | — | ✓ | 3rd |
| https://s3-us-west-2.amazonaws.com/s.cdpn.io/3/jquery.fittext.js | 2 KB | — | ✓ | 3rd |
| https://www.googletagservices.com/tag/js/gpt.js | 34 KB | — | ✓ | 3rd |
| https://www.cjr.org/wp-content/uploads/matomo/matomo.js | 22 KB | — | ✓ | 3rd |
| https://ssl.geoplugin.net/extras/cookielaw.js?k=2f01c7e20292ea09 | 0 KB | — | ✓ | 3rd |
| https://cdn.jsdelivr.net/npm/bootstrap@5.2.2/dist/js/bootstrap.bundle.min.js | 24 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
DPage Weight InventoryAction91 resources · 9.4 MB · 259 KB savings availableFIX
~259.1 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 91 resources | 9.4 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction25 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.
Performance issues directly impact user engagement and conversion rates.
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
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
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
A+Text CompressionAll text resources are compressedPASS
A+Font Loading7 fonts (369 KB)PASS
Web fonts
7
369 KB total
Render-blocking
0
of 7
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Convert to woff2 for ~30% smaller file size
- 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 ~39 KB and ~78 ms
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
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Google Cloud
Network Waterfall91 requests over 2439msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
code.jquery.com code.jquery.com | Other | 840ms | 30 KB | — | €9/mo | Costly |
Unattributable Unattributable | Other | 691ms | 0 KB | — | €8/mo | Costly |
www.cjr.org www.cjr.org | Other | 564ms | 67 KB | — | €6/mo | Costly |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 439ms | 188 KB | 55% | €5/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 232ms | 151 KB | 43% | €3/mo | Costly |
pagead2.googlesyndication.com pagead2.googlesyndication.com | Other | 205ms | 73 KB | 43% | €2/mo | Costly |
sdk.mrf.io sdk.mrf.io | Other | 194ms | 42 KB | — | €2/mo | Optional |
www.cjr.org www.cjr.org | Other | 161ms | 0 KB | — | €2/mo | Optional |
www.googletagservices.com www.googletagservices.com | Other | 69ms | 34 KB | — | €1/mo | Optional |
www.cjr.org www.cjr.org | Other | 53ms | 22 KB | — | €1/mo | Optional |
www.cjr.org www.cjr.org | Other | 51ms | 84 KB | 71% | €1/mo | Optional |
These scripts may cost more than they're worth
- code.jquery.com adds 840ms and costs ~€9/month
- Unattributable adds 691ms and costs ~€8/month
- www.cjr.org adds 564ms and costs ~€6/month
- securepubads.g.doubleclick.net adds 439ms and costs ~€5/month
- Google Tag Manager adds 232ms and costs ~€3/month
- pagead2.googlesyndication.com adds 205ms 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
code.jquery.com takes 840ms 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 691ms 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.cjr.org takes 564ms 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
securepubads.g.doubleclick.net takes 439ms 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
55% 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
Google Tag Manager takes 232ms 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
pagead2.googlesyndication.com takes 205ms 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
71% of www.cjr.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