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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
80
GRADE
B
FIX
3
REVIEW
4
PASS
6
INFO
2

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
91
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
96
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

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

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
15
6 PASS 4 REVIEW 3 FIX
D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (1.8 MiB of 1.8 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
64 resources · 1.8 MB · 289 KB savings available
FIX
64 resources · 1.8 MB · 289 KB savings available
Warning::
Page weight 789 KB over 1MB target
Got: 1.8 MB Expected: ≤ 1 MB
Info::
~289 KB of savings available
Warning::
63 third-party resources (100% of weight)
Info::
1 resources over 200KB
64 resources · 1.8 MiB · 63 third-party 789.3 KiB over 1MB target
JavaScript 44% · 798.8 KiB
Font 31% · 568.0 KiB
Image 14% · 259.1 KiB
CSS 6% · 101.3 KiB
Document 4% · 68.8 KiB
Other 1% · 17.2 KiB

~288.9 KiB of savings available

Remove unused JavaScript: 288.9 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

C
Page Weight Budget
Action
1.8 MB transferred, 64 requests
REVIEW
1.8 MB transferred, 64 requests
Info::
Page weighs 5.2 MB (1.8 MB transferred)
Warning::
JavaScript is 798 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 798 KB
Info::
Fonts are 568 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 568 KB
Info::
64 HTTP requests
Info::
Estimated 0.37 g CO2 per page load
1.8 MB / 2.4 MB budget
1.8 MB transferred
64 requests
0.37 g CO2 per page load
JavaScript 798.2 KiB 44%
Fonts 568.0 KiB 31%
Images 256.2 KiB 14%
CSS 101.3 KiB 6%
HTML 68.6 KiB 4%
Other 12.1 KiB 1%
Other 5.1 KiB 0%
Other 3.1 KiB 0%
Other 669 B 0%
0 2.4 MB 4.9 MB
Approaching limit

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

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.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

B
JS Execution Cost
715ms total JS execution
REVIEW
715ms total JS execution
Warning::
https://www.computerworld.com/: 299ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-NN4...: 142ms CPU time
Info::
Unattributable: 103ms CPU time
Info::
https://cmpv2.computerworld.com/Notice.8f529.js: 86ms CPU time
Info::
https://cmpv2.computerworld.com/unified/wrapperMes...: 85ms CPU time
Warning::
Third-party scripts: 715ms (100% of total)

Main Thread Breakdown

Script Evaluation 47% Style & Layout 20% Other 15% Script Parsing & Compilation 9% Parse HTML & CSS 6% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://www.computerworld.com/299ms46ms6ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NN43QC7W142ms111ms26ms3rd
Unattributable103ms6ms0ms3rd
https://cmpv2.computerworld.com/Notice.8f529.js86ms71ms7ms3rd
https://cmpv2.computerworld.com/unified/wrapperMessagingWithoutDetection.js85ms72ms3ms3rd
C
JS Bundles
Action
21 scripts, 289 KB unused
REVIEW
21 scripts, 289 KB unused
Warning::
https://cmpv2.computerworld.com/Notice.8f529.js: 61 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-BYS5...: 60 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-NN4...: 58 KB unused (28%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.computerworld.com/_static/??-eJydj90Kw...: 37 KB unused (59%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.computerworld.com/_static/??-eJylkN0Og...: 29 KB unused (56%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 289 KB
289 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://cmpv2.computerworld.com/Notice.8f529.js91 KB61 KB (67%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-BYS55606V0&cx=c&gtm=4e64h1145 KB60 KB (41%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NN43QC7W209 KB58 KB (28%)✓3rd
https://www.computerworld.com/_static/??-eJydj90KwjAMRl/IrOqguxKfpT9hy2i72qSMvf2KOtArQQh8ED5OTtSawS1JMIlygVpArJBDHSmxIj+CTFQ8ZFNkU55YFLtCWVjNaw5mw9LNfFL/Y3JBSx6M5wNEyYXqsV1o86hYtnd0kdLPEkQaixH8LB9qMmHEl4+9WrCGEZ67byVXWZbYPghCjAGdNNA93i7DoHutz7qfd0B+dEY=63 KB37 KB (59%)✓3rd
https://www.computerworld.com/_static/??-eJylkN0OgjAMRl/IOpVkXBmfpfsRhmMsawF5ewcXRBOJCV41+ZJz+rVijKC7wDaw0N7lAW0P0feVCyScqYBrlwxETDwJ44gF6eQik7inhTOgEgYTO2JQvtOPY0MH8abl2raWhB5BXRTo2nkDS/apwwafvkMDFbLNC7OPNlRzrdmlkOw3leqD8XYnvPb4p8EqsUOm9loGTBNo1PXWLT9/GuNOcokye2uv57KUhZQnWTQvxeTN6g==53 KB29 KB (56%)✓3rd
https://macro.adnami.io/macro/gen/adsm.macro.rmb.js25 KB22 KB (88%)✓3rd
https://www.computerworld.com/wp-content/client-mu-plugins/idg-third-party/dist/scripts/index.js?ver=177636606338 KB22 KB (57%)✓3rd
https://cp.computerworld.com/now.js35 KB—✓3rd
https://cmpv2.computerworld.com/mms/v2/get_site_data?hasCsp=true&href=https%3A%2F%2Fwww.computerworld.com%2F&account_id=1461 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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Image Optimization
7 images, 0 KB saveable
PASS
7 images, 0 KB saveable
Info::
All images are well-optimized
7 images 256 KB
0 oversized -0 KB
0 legacy format
0 missing dimensions CLS risk
A+
Font Loading
11 fonts (568 KB)
PASS
11 fonts (568 KB)
Info::
11 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

11

568 KB total

Render-blocking

0

of 11

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s FCP 1.1 s LCP 1.3 shttps://www.computerworld.com/wp-content/themes/idg-b2b-base-theme/dist/static/assets/fonts/cio/graphik-500.woff2graphik-500.woff2 https://www.computerworld.com/wp-content/themes/idg-b2b-base-theme/dist/static/assets/fonts/cio/graphik-500.woff2 — 42.2 KiB — 12 ms — font-display: swaphttps://www.computerworld.com/wp-content/themes/idg-b2b-base-theme/dist/static/assets/fonts/cio/graphik-400.woff2graphik-400.woff2 https://www.computerworld.com/wp-content/themes/idg-b2b-base-theme/dist/static/assets/fonts/cio/graphik-400.woff2 — 38.2 KiB — 13 ms — font-display: swaphttps://use.typekit.net/af/92b869/00000000000000007735e7d3/30/l?fvd=n5&primer=7fa3915bdafdf03041871920a205bef951d72bf64dd4c4460fb992e3ecc3a862&v=3l https://use.typekit.net/af/92b869/00000000000000007735e7d3/30/l?fvd=n5&primer=7fa3915bdafdf03041871920a205bef951d72bf64dd4c4460fb992e3ecc3a862&v=3 — 19.4 KiB — 30 ms — font-display: swaphttps://use.typekit.net/af/334c28/00000000000000007735e7dc/30/l?fvd=n5&primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&v=3l https://use.typekit.net/af/334c28/00000000000000007735e7dc/30/l?fvd=n5&primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&v=3 — 29.5 KiB — 34 ms — font-display: swaphttps://use.typekit.net/af/b75561/00000000000000007735e7d9/30/l?fvd=n5&primer=7fa3915bdafdf03041871920a205bef951d72bf64dd4c4460fb992e3ecc3a862&v=3l https://use.typekit.net/af/b75561/00000000000000007735e7d9/30/l?fvd=n5&primer=7fa3915bdafdf03041871920a205bef951d72bf64dd4c4460fb992e3ecc3a862&v=3 — 19.3 KiB — 32 ms — font-display: swaphttps://use.typekit.net/af/5eb48e/00000000000000007735e7d8/30/l?fvd=n4&primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&v=3l https://use.typekit.net/af/5eb48e/00000000000000007735e7d8/30/l?fvd=n4&primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&v=3 — 28.8 KiB — 5 ms — font-display: swaphttps://use.typekit.net/af/f28e6a/00000000000000007735e7dc/31/l?primer=f592e0a4b9356877842506ce344308576437e4f677d7c9b78ca2162e6cad991a&fvd=n5&v=3l https://use.typekit.net/af/f28e6a/00000000000000007735e7dc/31/l?primer=f592e0a4b9356877842506ce344308576437e4f677d7c9b78ca2162e6cad991a&fvd=n5&v=3 — 82.2 KiB — 23 ms — font-display: swaphttps://use.typekit.net/af/2dd387/00000000000000007735e7d3/31/l?primer=f592e0a4b9356877842506ce344308576437e4f677d7c9b78ca2162e6cad991a&fvd=n5&v=3l https://use.typekit.net/af/2dd387/00000000000000007735e7d3/31/l?primer=f592e0a4b9356877842506ce344308576437e4f677d7c9b78ca2162e6cad991a&fvd=n5&v=3 — 83.6 KiB — 30 ms — font-display: swaphttps://use.typekit.net/af/cb23cc/00000000000000007735e7d9/31/l?primer=f592e0a4b9356877842506ce344308576437e4f677d7c9b78ca2162e6cad991a&fvd=n5&v=3l https://use.typekit.net/af/cb23cc/00000000000000007735e7d9/31/l?primer=f592e0a4b9356877842506ce344308576437e4f677d7c9b78ca2162e6cad991a&fvd=n5&v=3 — 82.3 KiB — 23 ms — font-display: swaphttps://use.typekit.net/af/8fd457/00000000000000007735e7d8/31/l?primer=f592e0a4b9356877842506ce344308576437e4f677d7c9b78ca2162e6cad991a&fvd=n4&v=3l https://use.typekit.net/af/8fd457/00000000000000007735e7d8/31/l?primer=f592e0a4b9356877842506ce344308576437e4f677d7c9b78ca2162e6cad991a&fvd=n4&v=3 — 80.4 KiB — 28 ms — font-display: swaphttps://use.typekit.net/af/e34097/00000000000000007735bc72/31/l?primer=f592e0a4b9356877842506ce344308576437e4f677d7c9b78ca2162e6cad991a&fvd=n4&v=3l https://use.typekit.net/af/e34097/00000000000000007735bc72/31/l?primer=f592e0a4b9356877842506ce344308576437e4f677d7c9b78ca2162e6cad991a&fvd=n4&v=3 — 62.0 KiB — 29 ms — font-display: swap
graphik-500.woff2 woff2 swap
Size 42 KB
Load time 12 ms
Start 1.4 s
Risk FOUT — text flashes from fallback to web font
graphik-400.woff2 woff2 swap
Size 38 KB
Load time 13 ms
Start 1.4 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 19 KB
Load time 30 ms
Start 1.4 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 29 KB
Load time 34 ms
Start 1.4 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 19 KB
Load time 32 ms
Start 1.4 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 29 KB
Load time 5 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 82 KB
Load time 23 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 84 KB
Load time 30 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 82 KB
Load time 23 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 80 KB
Load time 28 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 62 KB
Load time 29 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
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 Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
64 requests over 2501ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.1 s LCP 1.3 shttps://computerworld.com// https://computerworld.com/ — 301 — 153 B — 125 ms — h2https://www.computerworld.com/www.computerworld.com/ https://www.computerworld.com/ — 200 — 66.4 KiB — 1.1 s — h2https://www.computerworld.com/wp-includes/css/dist/block-library/style.min.css?ver=6.8.5www.computerworld.com/wp-includes/c... https://www.computerworld.com/wp-includes/css/dist/block-library/style.min.css?ver=6.8.5 — 200 — 15.5 KiB — 22 ms — h2https://www.computerworld.com/wp-content/mu-plugins/search/elasticpress/dist/css/related-posts-block-styles.min.css?ver=4.2.2www.computerworld.com/wp-content/mu... https://www.computerworld.com/wp-content/mu-plugins/search/elasticpress/dist/css/related-posts-block-styles.min.css?ver=4.2.2 — 200 — 498 B — 37 ms — h2https://www.computerworld.com/wp-content/client-mu-plugins/idg-editions/dist/styles/main.css?ver=0.1.0www.computerworld.com/wp-content/cl... https://www.computerworld.com/wp-content/client-mu-plugins/idg-editions/dist/styles/main.css?ver=0.1.0 — 200 — 1.2 KiB — 31 ms — h2https://www.computerworld.com/wp-content/client-mu-plugins/idg-third-party/dist/styles/index.css?ver=1776366063www.computerworld.com/wp-content/cl... https://www.computerworld.com/wp-content/client-mu-plugins/idg-third-party/dist/styles/index.css?ver=1776366063 — 200 — 1.5 KiB — 17 ms — h2https://www.computerworld.com/wp-content/themes/idg-b2b-base-theme/dist/styles/jwplayer.css?ver=1776366063www.computerworld.com/wp-content/th... https://www.computerworld.com/wp-content/themes/idg-b2b-base-theme/dist/styles/jwplayer.css?ver=1776366063 — 200 — 1.1 KiB — 18 ms — h2https://www.computerworld.com/wp-content/themes/idg-b2b-base-theme/dist/styles/shared.css?ver=1776366063www.computerworld.com/wp-content/th... https://www.computerworld.com/wp-content/themes/idg-b2b-base-theme/dist/styles/shared.css?ver=1776366063 — 200 — 2.0 KiB — 20 ms — h2https://www.computerworld.com/wp-content/themes/idg-b2b-base-theme/dist/styles/bundle.css?ver=1776366063www.computerworld.com/wp-content/th... https://www.computerworld.com/wp-content/themes/idg-b2b-base-theme/dist/styles/bundle.css?ver=1776366063 — 200 — 59.3 KiB — 33 ms — h2https://www.computerworld.com/wp-content/themes/cw-b2b-child-theme/dist/styles/amp.css?ver=1776366063www.computerworld.com/wp-content/th... https://www.computerworld.com/wp-content/themes/cw-b2b-child-theme/dist/styles/amp.css?ver=1776366063 — 200 — 9.9 KiB — 27 ms — h2https://www.computerworld.com/wp-includes/js/dist/hooks.min.js?m=1774626878gwww.computerworld.com/wp-includes/j... https://www.computerworld.com/wp-includes/js/dist/hooks.min.js?m=1774626878g — 200 — 1.9 KiB — 25 ms — h2https://www.computerworld.com/wp-includes/js/dist/i18n.min.js?ver=5e580eb46a90c2b997e6www.computerworld.com/wp-includes/j... https://www.computerworld.com/wp-includes/js/dist/i18n.min.js?ver=5e580eb46a90c2b997e6 — 200 — 3.9 KiB — 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 715ms · 409KB · $12/mo
www.computerworld.com
Other
Costly
Execution 299ms
Transfer 66 KB
Monthly Cost $5/mo
Google Tag Manager
Tag Manager
Optional
Execution 142ms
Transfer 209 KB
Unused 28%
Monthly Cost $2/mo
Unattributable
Other
Optional
Execution 103ms
Transfer 0 KB
Monthly Cost $2/mo
cmpv2.computerworld.com
Other
Optional
Execution 86ms
Transfer 91 KB
Unused 67%
Monthly Cost $1/mo
cmpv2.computerworld.com
Other
Optional
Execution 85ms
Transfer 42 KB
Monthly Cost $1/mo

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.

Why this matters

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.

Why this matters

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.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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