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.
2.61 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
4.58 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
569 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.
3.30 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.
11.89 s
Page Load Progression
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DJS Execution CostAction2892ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.computer.org/ | 697ms | 55ms | 45ms | 3rd |
| https://www.computer.org/_next/static/chunks/7023-de08e90fe6034213.js | 600ms | 471ms | 23ms | 3rd |
| https://cmp.osano.com/AzyzptTmRlqVd2LRf/dc14b2c6-ae04-4497-98f0-2bdbdd2af415/osano.js | 403ms | 352ms | 10ms | 3rd |
| Unattributable | 337ms | 28ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-N7782B0VN4&cx=c>m=4e64h1 | 230ms | 192ms | 36ms | 3rd |
| https://www.computer.org/_next/static/chunks/fd9d1056-4895dfff47e87bd7.js | 204ms | 170ms | 12ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-PPQ37HW | 189ms | 149ms | 32ms | 3rd |
| https://cdn.feathr.co/js/boomerang.min.js | 125ms | 106ms | 9ms | 3rd |
| https://connect.facebook.net/en_US/fbevents.js | 107ms | 83ms | 24ms | 3rd |
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BPage Weight Budget1.4 MB transferred, 80 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
BImage Optimization17 images, 0 KB saveableREVIEW
CJS BundlesAction38 scripts, 180 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtag/js?id=G-N7782B0VN4&cx=c>m=4e64h1 | 172 KB | 73 KB (42%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-PPQ37HW | 136 KB | 63 KB (47%) | ✓ | 3rd |
| https://connect.facebook.net/en_US/fbevents.js | 97 KB | 44 KB (46%) | ✓ | 3rd |
| https://www.computer.org/_next/static/chunks/2333-5f3c5a6d88aaf67e.js | 16 KB | — | ✓ | 3rd |
| https://www.computer.org/_next/static/chunks/app/layout-3db7c002fe58c697.js | 14 KB | — | ✓ | 3rd |
| https://www.computer.org/_next/static/chunks/main-app-70fb7231193511ce.js | 1 KB | — | ✓ | 3rd |
| https://www.computer.org/_next/static/chunks/app/global-error-70363a7844e983ef.js | 3 KB | — | ✓ | 3rd |
| https://www.computer.org/_next/static/chunks/998-4bc3ad25ed52586d.js | 10 KB | — | ✓ | 3rd |
| https://www.computer.org/_next/static/chunks/6164-9f27c05a522a8294.js | 7 KB | — | ✓ | 3rd |
| https://www.computer.org/_next/static/chunks/231-5d380eb9d70f48bb.js | 7 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
CPage Weight InventoryAction80 resources · 1.4 MB · 180 KB savings availableREVIEW
~180.3 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 80 resources | 1.4 MiB | ||||||
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 Loading4 fonts (131 KB)PASS
Web fonts
4
131 KB total
Render-blocking
0
of 4
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+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall80 requests over 2002msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.computer.org www.computer.org | Other | 697ms | 121 KB | — | $9/mo | Costly |
www.computer.org www.computer.org | Other | 600ms | 31 KB | — | $8/mo | Costly |
cmp.osano.com cmp.osano.com | Other | 403ms | 39 KB | — | $5/mo | Costly |
Unattributable Unattributable | Other | 337ms | 0 KB | — | $4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 230ms | 172 KB | 42% | $3/mo | Costly |
www.computer.org www.computer.org | Other | 204ms | 53 KB | — | $3/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 189ms | 136 KB | 47% | $3/mo | Optional |
cdn.feathr.co cdn.feathr.co | Other | 125ms | 42 KB | — | $2/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 107ms | 97 KB | 46% | $1/mo | Optional |
These scripts may cost more than they're worth
- www.computer.org adds 697ms and costs ~$9/month
- www.computer.org adds 600ms and costs ~$8/month
- cmp.osano.com adds 403ms and costs ~$5/month
- Unattributable adds 337ms and costs ~$4/month
- Google Tag Manager adds 230ms and costs ~$3/month
- www.computer.org adds 204ms 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.computer.org takes 697ms 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.computer.org takes 600ms 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
cmp.osano.com takes 403ms 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 337ms 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 230ms 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.computer.org takes 204ms 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