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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
76
GRADE
C
FIX
6
REVIEW
1
PASS
8
INFO
2

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

Mobile Desktop
19
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
95
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
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.

6.24 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

17.17 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

1.06 s

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.330

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

7.10 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.

17.20 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
17
8 PASS 1 REVIEW 6 FIX
D
Page Weight Budget
Action
2.2 MB transferred, 80 requests
FIX
2.2 MB transferred, 80 requests
Info::
Page weighs 5.4 MB (2.2 MB transferred)
Warning::
Images are 1.1 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.1 MB
Warning::
JavaScript is 1013 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1013 KB
Info::
80 HTTP requests
Info::
Estimated 0.47 g CO2 per page load
2.2 MB / 2.4 MB budget
2.2 MB transferred
80 requests
0.47 g CO2 per page load
Images 1.1 MiB 47%
JavaScript 1013.3 KiB 44%
CSS 85.4 KiB 4%
Fonts 53.4 KiB 2%
HTML 46.5 KiB 2%
Other 12.4 KiB 1%
Other 5.1 KiB 0%
Other 932 B 0%
0 2.4 MB 4.9 MB
Approaching limit

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

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.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

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 (2.2 MiB of 2.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
3044ms total JS execution
FIX
3044ms total JS execution
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-WMR...: 545ms CPU time
Warning::
Unattributable: 471ms CPU time
Warning::
https://www.pcworld.com/: 415ms CPU time
Warning::
https://cmpv2.pcworld.com/unified/wrapperMessaging...: 399ms CPU time
Warning::
https://cmpv2.pcworld.com/Notice.8f529.js: 398ms CPU time
Warning::
Third-party scripts: 3044ms (100% of total)

Main Thread Breakdown

Script Evaluation 58% Other 15% Script Parsing & Compilation 11% Style & Layout 10% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://www.googletagmanager.com/gtm.js?id=GTM-WMR8FDR6545ms425ms72ms3rd
Unattributable471ms21ms0ms3rd
https://www.pcworld.com/415ms109ms22ms3rd
https://cmpv2.pcworld.com/unified/wrapperMessagingWithoutDetection.js399ms329ms11ms3rd
https://cmpv2.pcworld.com/Notice.8f529.js398ms315ms38ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-17470842806&cx=c&gtm=4e64h1169ms133ms35ms3rd
https://www.googletagmanager.com/gtag/js?id=G-7PTFLSG8N9&cx=c&gtm=4e64h1157ms115ms41ms3rd
https://www.pcworld.com/wp-content/themes/idg-base-theme/dist/scripts/bundle.js?ver=1776782167138ms71ms19ms3rd
https://cmpv2.pcworld.com/unified/4.40.1/usnat.f12613136193900e32e2.bundle.js130ms99ms31ms3rd
https://www.pcworld.com/_static/??-eJydjUEKAyEMRS/UTJguxm5Kz2JVbEStTSKDtx8X03Wh8OFtHu/j3sC9q4aq6DJNQOnQco9UBclH0Bexh2ZZB3oSRXFMTQXT3rIdgZckF/w/0zg8yYP18g1Rdbn7MB/mPj3wOLEUqj8lKBTZajjlR7mvxmzmdl03kw6FZ1jZ91ms60ms18ms3rd

Showing top 10 of 12 scripts

D
JS Bundles
Action
28 scripts, 393 KB unused
FIX
28 scripts, 393 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-174...: 63 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cmpv2.pcworld.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-7PTF...: 60 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-WMR...: 54 KB unused (28%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.pcworld.com/_static/??-eJydjUEKAyEMRS/...: 45 KB unused (62%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 393 KB
393 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=AW-17470842806&cx=c&gtm=4e64h1144 KB63 KB (44%)✓3rd
https://cmpv2.pcworld.com/Notice.8f529.js91 KB61 KB (67%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-7PTFLSG8N9&cx=c&gtm=4e64h1145 KB60 KB (41%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WMR8FDR6192 KB54 KB (28%)✓3rd
https://www.pcworld.com/_static/??-eJydjUEKAyEMRS/UTJguxm5Kz2JVbEStTSKDtx8X03Wh8OFtHu/j3sC9q4aq6DJNQOnQco9UBclH0Bexh2ZZB3oSRXFMTQXT3rIdgZckF/w/0zg8yYP18g1Rdbn7MB/mPj3wOLEUqj8lKBTZajjlR7mvxmzmdl03kw6FZ1jZ72 KB45 KB (62%)✓3rd
https://www.pcworld.com/wp-content/themes/idg-base-theme/dist/scripts/bundle.js?ver=177678216766 KB42 KB (63%)✓3rd
https://www.pcworld.com/wp-content/client-mu-plugins/idg-third-party/dist/scripts/index.js?ver=177678216744 KB24 KB (55%)✓3rd
https://macro.adnami.io/macro/gen/adsm.macro.rmb.js25 KB22 KB (88%)✓3rd
https://cmpv2.pcworld.com/unified/4.40.1/usnat.f12613136193900e32e2.bundle.js42 KB22 KB (52%)✓3rd
https://cmpv2.pcworld.com/unified/wrapperMessagingWithoutDetection.js42 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

D
Page Weight Inventory
Action
80 resources · 2.2 MB · 393 KB savings available
FIX
80 resources · 2.2 MB · 393 KB savings available
Warning::
Page weight 1.2 MB over 1MB target
Got: 2.2 MB Expected: ≤ 1 MB
Info::
~393 KB of savings available
Warning::
79 third-party resources (100% of weight)
Info::
1 resources over 200KB
80 resources · 2.2 MiB · 79 third-party 1.2 MiB over 1MB target
Image 47% · 1.1 MiB
JavaScript 44% · 1013.9 KiB
CSS 4% · 85.4 KiB
Font 2% · 53.4 KiB
Document 2% · 47.3 KiB
Other 1% · 16.5 KiB

~393.0 KiB of savings available

Remove unused JavaScript: 393.0 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.

B
Image Optimization
26 images, 0 KB saveable
REVIEW
26 images, 0 KB saveable
Warning::
https://www.pcworld.com/wp-content/uploads/2026/04... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.pcworld.com/wp-content/uploads/2026/04... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.pcworld.com/wp-content/uploads/2026/04... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.pcworld.com/wp-content/uploads/2026/04... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.pcworld.com/wp-content/uploads/2026/04... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.pcworld.com/wp-content/uploads/2026/04... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.pcworld.com/wp-content/uploads/2026/04... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.pcworld.com/wp-content/uploads/2026/04... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.pcworld.com/wp-content/uploads/2026/04... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.pcworld.com/wp-content/uploads/2026/04... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.pcworld.com/wp-content/uploads/2026/04... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.pcworld.com/wp-content/uploads/2026/04... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.pcworld.com/wp-content/uploads/2026/04... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.pcworld.com/wp-content/uploads/2026/04... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.pcworld.com/wp-content/uploads/2026/04... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.pcworld.com/wp-content/uploads/2026/04... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.pcworld.com/wp-content/uploads/2026/04... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.pcworld.com/wp-content/uploads/2026/04... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.pcworld.com/wp-content/uploads/2026/04... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.pcworld.com/wp-content/uploads/2026/04... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
26 images 1.1 MB
0 oversized -0 KB
1 legacy format
20 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

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+
Font Loading
2 fonts (53 KB)
PASS
2 fonts (53 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

53 KB total

Render-blocking

0

of 2

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s FCP 6.2 s LCP 17.2 shttps://use.typekit.net/af/b00ba4/00000000000000007759afd3/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3l https://use.typekit.net/af/b00ba4/00000000000000007759afd3/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3 — 26.8 KiB — 14 ms — font-display: swaphttps://use.typekit.net/af/ce8cbe/0000000000000000775a92b0/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n6&v=3l https://use.typekit.net/af/ce8cbe/0000000000000000775a92b0/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n6&v=3 — 26.6 KiB — 10 ms — font-display: swap
l woff2 swap
Size 27 KB
Load time 14 ms
Start 435 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 27 KB
Load time 10 ms
Start 436 ms
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
4 hints, 0 missing preconnects
PASS
4 hints, 0 missing preconnects
Info::
Page uses 4 resource hint(s)

Current Resource Hints

preconnect
—
preload
4
dns-prefetch
—
prefetch
—

4 resource hints configured

A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
80 requests over 1493ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s FCP 6.2 s LCP 17.2 shttps://pcworld.com// https://pcworld.com/ — 301 — 405 B — 175 ms — h2https://www.pcworld.com/www.pcworld.com/ https://www.pcworld.com/ — 200 — 44.3 KiB — 43 ms — h2https://www.pcworld.com/wp-includes/css/dist/block-library/style.min.css?ver=6.8.5www.pcworld.com/wp-includes/css/dis... https://www.pcworld.com/wp-includes/css/dist/block-library/style.min.css?ver=6.8.5 — 200 — 15.4 KiB — 35 ms — h2https://www.pcworld.com/wp-content/client-mu-plugins/idg-sponsored-price-comparison/dist/styles/main.css?ver=1776782167www.pcworld.com/wp-content/client-m... https://www.pcworld.com/wp-content/client-mu-plugins/idg-sponsored-price-comparison/dist/styles/main.css?ver=1776782167 — 200 — 642 B — 32 ms — h2https://www.pcworld.com/wp-content/client-mu-plugins/idg-third-party/dist/styles/index.css?ver=1776782167www.pcworld.com/wp-content/client-m... https://www.pcworld.com/wp-content/client-mu-plugins/idg-third-party/dist/styles/index.css?ver=1776782167 — 200 — 1.2 KiB — 47 ms — h2https://www.pcworld.com/wp-content/themes/idg-base-theme/dist/styles/jwplayer.css?ver=1776782167www.pcworld.com/wp-content/themes/i... https://www.pcworld.com/wp-content/themes/idg-base-theme/dist/styles/jwplayer.css?ver=1776782167 — 200 — 995 B — 48 ms — h2https://www.pcworld.com/wp-content/themes/idg-base-theme/dist/styles/shared.css?ver=1776782167www.pcworld.com/wp-content/themes/i... https://www.pcworld.com/wp-content/themes/idg-base-theme/dist/styles/shared.css?ver=1776782167 — 200 — 14.1 KiB — 34 ms — h2https://www.pcworld.com/wp-content/themes/idg-base-theme/dist/styles/bundle.css?ver=1776782167www.pcworld.com/wp-content/themes/i... https://www.pcworld.com/wp-content/themes/idg-base-theme/dist/styles/bundle.css?ver=1776782167 — 200 — 41.9 KiB — 44 ms — 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https://www.pcworld.com/wp-content/uploads/2026/04/Innocn-49-inch-1440p-Ultrawide-Gaming-Monitor-49Q1R.jpg?quality=50&strip=all&w=300&h=200&crop=1 — 200 — 8.6 KiB — 25 ms — h2https://www.pcworld.com/wp-content/uploads/2026/04/Microsoft-Defender-Antivirus-on-Windows-11-dark-background.jpg?quality=50&strip=all&w=300&h=200&crop=1www.pcworld.com/wp-content/uploads/... https://www.pcworld.com/wp-content/uploads/2026/04/Microsoft-Defender-Antivirus-on-Windows-11-dark-background.jpg?quality=50&strip=all&w=300&h=200&crop=1 — 200 — 3.9 KiB — 26 ms — h2https://www.pcworld.com/wp-content/uploads/2026/04/solarseven-Shutterstock.com_-1.jpg?quality=50&strip=all&w=300&h=200&crop=1www.pcworld.com/wp-content/uploads/... https://www.pcworld.com/wp-content/uploads/2026/04/solarseven-Shutterstock.com_-1.jpg?quality=50&strip=all&w=300&h=200&crop=1 — 200 — 11.4 KiB — 27 ms — 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h2https://www.pcworld.com/wp-content/uploads/2026/04/Acemagic-AM06-Pro-mini-PC.jpg?quality=50&strip=all&w=300&h=200&crop=1www.pcworld.com/wp-content/uploads/... https://www.pcworld.com/wp-content/uploads/2026/04/Acemagic-AM06-Pro-mini-PC.jpg?quality=50&strip=all&w=300&h=200&crop=1 — 200 — 5.7 KiB — 31 ms — h2https://www.pcworld.com/wp-content/uploads/2026/04/bf-laptop-deals-pcw-14.jpg?quality=50&strip=all&w=300&h=200&crop=1www.pcworld.com/wp-content/uploads/... https://www.pcworld.com/wp-content/uploads/2026/04/bf-laptop-deals-pcw-14.jpg?quality=50&strip=all&w=300&h=200&crop=1 — 200 — 4.6 KiB — 25 ms — h2https://www.pcworld.com/wp-content/uploads/2026/04/Google-AI-slop-on-screen-2.jpg?quality=50&strip=all&w=300&h=200&crop=1www.pcworld.com/wp-content/uploads/... https://www.pcworld.com/wp-content/uploads/2026/04/Google-AI-slop-on-screen-2.jpg?quality=50&strip=all&w=300&h=200&crop=1 — 200 — 2.2 KiB — 27 ms — h2https://www.pcworld.com/wp-content/uploads/2026/04/Starlink-logo-on-a-screen-with-planet-and-satellites-in-background.jpg?quality=50&strip=all&w=300&h=200&crop=1www.pcworld.com/wp-content/uploads/... https://www.pcworld.com/wp-content/uploads/2026/04/Starlink-logo-on-a-screen-with-planet-and-satellites-in-background.jpg?quality=50&strip=all&w=300&h=200&crop=1 — 200 — 7.6 KiB — 28 ms — h2https://www.pcworld.com/wp-content/uploads/2026/04/pcw-desktoppc-prime-1-3.jpg?quality=50&strip=all&w=300&h=200&crop=1www.pcworld.com/wp-content/uploads/... https://www.pcworld.com/wp-content/uploads/2026/04/pcw-desktoppc-prime-1-3.jpg?quality=50&strip=all&w=300&h=200&crop=1 — 200 — 7.5 KiB — 28 ms — h2https://www.pcworld.com/wp-content/uploads/2026/04/Siri-working-with-ChatGPT-on-iOS-2.jpeg?quality=50&strip=all&w=300&h=200&crop=1www.pcworld.com/wp-content/uploads/... https://www.pcworld.com/wp-content/uploads/2026/04/Siri-working-with-ChatGPT-on-iOS-2.jpeg?quality=50&strip=all&w=300&h=200&crop=1 — 200 — 4.8 KiB — 24 ms — h2https://www.pcworld.com/wp-content/uploads/2026/04/Emoji-new-feature-within-Windows.png?w=300&h=200&crop=1www.pcworld.com/wp-content/uploads/... https://www.pcworld.com/wp-content/uploads/2026/04/Emoji-new-feature-within-Windows.png?w=300&h=200&crop=1 — 200 — 22.7 KiB — 32 ms — h2https://www.pcworld.com/wp-content/uploads/2026/04/corsair-mp600-pro-xt.jpg?quality=50&strip=all&w=300&h=200&crop=1www.pcworld.com/wp-content/uploads/... https://www.pcworld.com/wp-content/uploads/2026/04/corsair-mp600-pro-xt.jpg?quality=50&strip=all&w=300&h=200&crop=1 — 200 — 7.2 KiB — 26 ms — h2
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 3044ms · 913KB · €49/mo
Google Tag Manager
Tag Manager
Costly
Execution 545ms
Transfer 192 KB
Unused 28%
Monthly Cost €9/mo
Unattributable
Other
Costly
Execution 471ms
Transfer 0 KB
Monthly Cost €8/mo
www.pcworld.com
Other
Costly
Execution 415ms
Transfer 44 KB
Monthly Cost €7/mo
cmpv2.pcworld.com
Other
Costly
Execution 399ms
Transfer 42 KB
Monthly Cost €6/mo
cmpv2.pcworld.com
Other
Costly
Execution 398ms
Transfer 91 KB
Unused 67%
Monthly Cost €6/mo
Google Tag Manager
Tag Manager
Optional
Execution 169ms
Transfer 144 KB
Unused 44%
Monthly Cost €3/mo
Google Tag Manager
Tag Manager
Optional
Execution 157ms
Transfer 145 KB
Unused 41%
Monthly Cost €3/mo
www.pcworld.com
Other
Optional
Execution 138ms
Transfer 66 KB
Unused 63%
Monthly Cost €2/mo
cmpv2.pcworld.com
Other
Optional
Execution 130ms
Transfer 42 KB
Unused 52%
Monthly Cost €2/mo
www.pcworld.com
Other
Optional
Execution 91ms
Transfer 72 KB
Unused 62%
Monthly Cost €1/mo
cmpv2.pcworld.com
Other
Optional
Execution 66ms
Transfer 29 KB
Monthly Cost €1/mo
www.pcworld.com
Other
Optional
Execution 64ms
Transfer 44 KB
Unused 55%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Google Tag Manager adds 545ms and costs ~€9/month
  • Unattributable adds 471ms and costs ~€8/month
  • www.pcworld.com adds 415ms and costs ~€7/month
  • cmpv2.pcworld.com adds 399ms and costs ~€6/month
  • cmpv2.pcworld.com adds 398ms and costs ~€6/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

Google Tag Manager takes 545ms 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

Unattributable takes 471ms 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

www.pcworld.com takes 415ms 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

cmpv2.pcworld.com takes 399ms 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

cmpv2.pcworld.com takes 398ms 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.pcworld.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

63% of www.pcworld.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

52% of cmpv2.pcworld.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

62% of www.pcworld.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

55% of www.pcworld.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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