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.
1.13 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.33 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
8 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.020
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
1.93 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.
2.38 s
Page Load Progression
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DPage Weight InventoryAction64 resources · 1.8 MB · 289 KB savings availableFIX
~288.9 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 64 resources | 1.8 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CPage Weight BudgetAction1.8 MB transferred, 64 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
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
BJS Execution Cost715ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.computerworld.com/ | 299ms | 46ms | 6ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-NN43QC7W | 142ms | 111ms | 26ms | 3rd |
| Unattributable | 103ms | 6ms | 0ms | 3rd |
| https://cmpv2.computerworld.com/Notice.8f529.js | 86ms | 71ms | 7ms | 3rd |
| https://cmpv2.computerworld.com/unified/wrapperMessagingWithoutDetection.js | 85ms | 72ms | 3ms | 3rd |
CJS BundlesAction21 scripts, 289 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://cmpv2.computerworld.com/Notice.8f529.js | 91 KB | 61 KB (67%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-BYS55606V0&cx=c>m=4e64h1 | 145 KB | 60 KB (41%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-NN43QC7W | 209 KB | 58 KB (28%) | ✓ | 3rd |
| https://www.computerworld.com/_static/??-eJydj90KwjAMRl/IrOqguxKfpT9hy2i72qSMvf2KOtArQQh8ED5OTtSawS1JMIlygVpArJBDHSmxIj+CTFQ8ZFNkU55YFLtCWVjNaw5mw9LNfFL/Y3JBSx6M5wNEyYXqsV1o86hYtnd0kdLPEkQaixH8LB9qMmHEl4+9WrCGEZ67byVXWZbYPghCjAGdNNA93i7DoHutz7qfd0B+dEY= | 63 KB | 37 KB (59%) | ✓ | 3rd |
| https://www.computerworld.com/_static/??-eJylkN0OgjAMRl/IOpVkXBmfpfsRhmMsawF5ewcXRBOJCV41+ZJz+rVijKC7wDaw0N7lAW0P0feVCyScqYBrlwxETDwJ44gF6eQik7inhTOgEgYTO2JQvtOPY0MH8abl2raWhB5BXRTo2nkDS/apwwafvkMDFbLNC7OPNlRzrdmlkOw3leqD8XYnvPb4p8EqsUOm9loGTBNo1PXWLT9/GuNOcokye2uv57KUhZQnWTQvxeTN6g== | 53 KB | 29 KB (56%) | ✓ | 3rd |
| https://macro.adnami.io/macro/gen/adsm.macro.rmb.js | 25 KB | 22 KB (88%) | ✓ | 3rd |
| https://www.computerworld.com/wp-content/client-mu-plugins/idg-third-party/dist/scripts/index.js?ver=1776366063 | 38 KB | 22 KB (57%) | ✓ | 3rd |
| https://cp.computerworld.com/now.js | 35 KB | — | ✓ | 3rd |
| https://cmpv2.computerworld.com/mms/v2/get_site_data?hasCsp=true&href=https%3A%2F%2Fwww.computerworld.com%2F&account_id=146 | 1 KB | — | ✓ | 3rd |
| https://www.computerworld.com/_static/??-eJylzzELwkAMBeA/5DW2gu0iDg5OXUTcc208U66XowmK/96i4K5dw3sfL/DIrpNklAzsRiMpcB+cr7zzqOTeN4jsQbuJsyl0MmZJc95dRYymYtAV/K5EVC2OZC0mDMuUE2HfykR/Gt9/Et45oLGkJWvOEkKkw6d5YWXPke05k/txV9b1tmw266oZXlaliqE= | 12 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
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
A+Image Optimization7 images, 0 KB saveablePASS
A+Font Loading11 fonts (568 KB)PASS
Web fonts
11
568 KB total
Render-blocking
0
of 11
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
Network Waterfall64 requests over 2501msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.computerworld.com www.computerworld.com | Other | 299ms | 66 KB | — | $5/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 142ms | 209 KB | 28% | $2/mo | Optional |
Unattributable Unattributable | Other | 103ms | 0 KB | — | $2/mo | Optional |
cmpv2.computerworld.com cmpv2.computerworld.com | Other | 86ms | 91 KB | 67% | $1/mo | Optional |
cmpv2.computerworld.com cmpv2.computerworld.com | Other | 85ms | 42 KB | — | $1/mo | Optional |
These scripts may cost more than they're worth
- www.computerworld.com adds 299ms 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
www.computerworld.com 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
67% of cmpv2.computerworld.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