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https://popularmechanics.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
4
REVIEW
4
PASS
5
INFO
2

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

Mobile Desktop
84
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.

1.04 s

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

1.87 s

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

80 ms

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

0.089

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.

3.10 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
5 PASS 4 REVIEW 4 FIX
F
Page Weight Budget
Action
3.0 MB transferred, 137 requests
FIX
3.0 MB transferred, 137 requests
Warning::
Page weighs 8.0 MB (3.0 MB transferred)
Warning::
JavaScript is 1.2 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.2 MB
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::
137 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.63 g CO2 per page load
3.0 MB / 2.4 MB budget
3.0 MB transferred
137 requests
0.63 g CO2 per page load
JavaScript 1.2 MiB 41%
Images 1.1 MiB 36%
Other 233.6 KiB 8%
Other 164.2 KiB 5%
Fonts 114.3 KiB 4%
HTML 110.0 KiB 4%
CSS 76.3 KiB 2%
Other 6.1 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

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

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

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

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 (3.0 MiB of 3.0 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
75 scripts, 491 KB unused
FIX
75 scripts, 491 KB unused
Warning::
https://securepubads.g.doubleclick.net/pagead/mana...: 140 KB unused (75%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.popularmechanics.com/_assets/moapt/2.4...: 85 KB unused (79%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.cookielaw.org/scripttemplates/202602.1...: 74 KB unused (57%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://c.amazon-adsystem.com/aax2/apstag.js: 57 KB unused (63%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.popularmechanics.com/_assets/moapt/2.4...: 47 KB unused (89%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 491 KB
491 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js188 KB140 KB (75%)✓3rd
https://www.popularmechanics.com/_assets/moapt/2.437.0/moapt-bidder-pb-hdm.10.23.0.js108 KB85 KB (79%)✓3rd
https://cdn.cookielaw.org/scripttemplates/202602.1.0/otBannerSdk.js129 KB74 KB (57%)✓3rd
https://c.amazon-adsystem.com/aax2/apstag.js91 KB57 KB (63%)✓3rd
https://www.popularmechanics.com/_assets/moapt/2.437.0/moapt-data.js53 KB47 KB (89%)✓3rd
https://www.popularmechanics.com/_assets/moapt/2.437.0/moapt-bundle-hdm.js58 KB44 KB (77%)✓3rd
https://www.popularmechanics.com/_assets/fre/scopes/hdm/_next/static/chunks/main-d2f686aa31e32b32.js42 KB23 KB (56%)✓3rd
https://www.popularmechanics.com/_assets/fre/scopes/hdm/_next/static/chunks/74011-55fecbe15c571fd6.js43 KB21 KB (49%)✓3rd
https://www.popularmechanics.com/_assets/fre/scopes/hdm/_next/static/chunks/88526-206d599008f77ae1.js5 KB—✓3rd
https://www.popularmechanics.com/_assets/fre/scopes/hdm/_next/static/chunks/34666-eb5a01ab88167f97.js9 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

F
Page Weight Inventory
Action
137 resources · 3.0 MB · 491 KB savings available
FIX
137 resources · 3.0 MB · 491 KB savings available
Warning::
Page weight 2.0 MB over 1MB target
Got: 3.0 MB Expected: ≤ 1 MB
Info::
~491 KB of savings available
Warning::
136 third-party resources (100% of weight)
137 resources · 3.0 MiB · 136 third-party 2.0 MiB over 1MB target
JavaScript 42% · 1.2 MiB
Image 37% · 1.1 MiB
Other 8% · 255.3 KiB
Document 7% · 220.9 KiB
Font 4% · 114.3 KiB
CSS 3% · 81.0 KiB

~491.2 KiB of savings available

Remove unused JavaScript: 491.2 KiB
C
Image Optimization
Action
40 images, 0 KB saveable
REVIEW
40 images, 0 KB saveable
Warning::
https://hips.hearstapps.com/hmg-prod/images/ancien... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://hips.hearstapps.com/hmg-prod/images/heart-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://hips.hearstapps.com/hmg-prod/images/photo-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://hips.hearstapps.com/hmg-prod/images/7ba8b6... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://hips.hearstapps.com/hmg-prod/images/e93b8b... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://hips.hearstapps.com/hmg-prod/images/e6c4ae... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://hips.hearstapps.com/hmg-prod/images/pop-ki... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://hips.hearstapps.com/hmg-prod/images/1e6465... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://hips.hearstapps.com/hmg-prod/images/555ea0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://hips.hearstapps.com/hmg-prod/images/televi... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://hips.hearstapps.com/hmg-prod/images/1c28b4... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://hips.hearstapps.com/hmg-prod/images/fkt240... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.popularmechanics.com/_assets/design-to... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://hips.hearstapps.com/hmg-prod/images/7652cb... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://hips.hearstapps.com/hmg-prod/images/mayan-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://hips.hearstapps.com/hmg-prod/images/5ead17... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://hips.hearstapps.com/hmg-prod/images/608016... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://hips.hearstapps.com/hmg-prod/images/b8a2ca... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://hips.hearstapps.com/hmg-prod/images/5134ef... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://hips.hearstapps.com/hmg-prod/images/91193a... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://hips.hearstapps.com/hmg-prod/images/finger... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://hips.hearstapps.com/hmg-prod/images/895800... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://hips.hearstapps.com/hmg-prod/images/cc4253... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://hips.hearstapps.com/hmg-prod/images/sparse... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://hips.hearstapps.com/hmg-prod/images/c7a8ce... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://hips.hearstapps.com/hmg-prod/images/d73cd8... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://hips.hearstapps.com/hmg-prod/images/fbee59... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://hips.hearstapps.com/hmg-prod/images/1b3231... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://hips.hearstapps.com/hmg-prod/images/roman-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
40 images 1.1 MB
0 oversized -0 KB
5 legacy format
30 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

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

Performance issues directly impact user engagement and conversion rates.

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

C
JS Execution Cost
Action
1180ms total JS execution
REVIEW
1180ms total JS execution
Warning::
Unattributable: 379ms CPU time
Info::
https://www.popularmechanics.com/_assets/fre/scope...: 218ms CPU time
Info::
https://www.popularmechanics.com/: 217ms CPU time
Info::
https://www.popularmechanics.com/_assets/fre/scope...: 177ms CPU time
Info::
https://www.popularmechanics.com/_assets/fre/scope...: 68ms CPU time
Warning::
Third-party scripts: 1180ms (100% of total)

Main Thread Breakdown

Script Evaluation 58% Other 18% Style & Layout 11% Script Parsing & Compilation 7%
ScriptTotalScriptingParse/CompileParty
Unattributable379ms131ms0ms3rd
https://www.popularmechanics.com/_assets/fre/scopes/hdm/_next/static/chunks/pages/_templates/feed-2ac9a8ad0d959ea6.js218ms210ms6ms3rd
https://www.popularmechanics.com/217ms7ms1ms3rd
https://www.popularmechanics.com/_assets/fre/scopes/hdm/_next/static/chunks/framework-81603682134898a6.js177ms135ms1ms3rd
https://www.popularmechanics.com/_assets/fre/scopes/hdm/_next/static/chunks/74394.3f0caca7d935bb63.js68ms59ms1ms3rd
https://www.popularmechanics.com/_assets/moapt/2.437.0/moapt-bidder-pb-hdm.10.23.0.js65ms53ms11ms3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js57ms38ms11ms3rd
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

B
HTTP Caching
max-age=0, must-revalidate, private
REVIEW
max-age=0, must-revalidate, private
Info::
Cache-Control header is set
Got: max-age=0, must-revalidate, private
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=0, must-revalidate, private

DirectiveValueMeaning
max-age0Cache for 0 seconds
must-revalidate—Must recheck with server after expiry
private—Only browser cache, not CDN/proxy
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
4 fonts (114 KB)
PASS
4 fonts (114 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

114 KB total

Render-blocking

0

of 4

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 1.0 s LCP 1.9 shttps://www.popularmechanics.com/_assets/design-tokens/popularmechanics/static/fonts/RobotoMono.b9f4a81.woff2RobotoMono.b9f4a81.woff2 https://www.popularmechanics.com/_assets/design-tokens/popularmechanics/static/fonts/RobotoMono.b9f4a81.woff2 — 32.7 KiB — 50 ms — font-display: swaphttps://www.popularmechanics.com/_assets/design-tokens/fre/static/fonts/inter-v3-latin-700.8b8011b.woff2inter-v3-latin-700.8b80... https://www.popularmechanics.com/_assets/design-tokens/fre/static/fonts/inter-v3-latin-700.8b8011b.woff2 — 18.2 KiB — 7 ms — font-display: swaphttps://www.popularmechanics.com/_assets/design-tokens/popularmechanics/static/fonts/work-sans-latin-600.62f942d.woff2work-sans-latin-600.62f... https://www.popularmechanics.com/_assets/design-tokens/popularmechanics/static/fonts/work-sans-latin-600.62f942d.woff2 — 21.2 KiB — 8 ms — font-display: swaphttps://www.popularmechanics.com/_assets/design-tokens/popularmechanics/static/fonts/UnitedSansCdBk.cde089b.woff2UnitedSansCdBk.cde089b.... https://www.popularmechanics.com/_assets/design-tokens/popularmechanics/static/fonts/UnitedSansCdBk.cde089b.woff2 — 42.2 KiB — 19 ms — font-display: swap
RobotoMono.b9f4a81.woff2 woff2 swap
Size 33 KB
Load time 50 ms
Start 145 ms
Risk FOUT — text flashes from fallback to web font
inter-v3-latin-700.8b80... woff2 swap
Size 18 KB
Load time 7 ms
Start 318 ms
Risk FOUT — text flashes from fallback to web font
work-sans-latin-600.62f... woff2 swap
Size 21 KB
Load time 8 ms
Start 319 ms
Risk FOUT — text flashes from fallback to web font
UnitedSansCdBk.cde089b.... woff2 swap
Size 42 KB
Load time 19 ms
Start 319 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
137 requests over 1816ms
INFO
0 ms 500 ms 1.0 s 1.5 s FCP 1.0 s LCP 1.9 shttps://popularmechanics.com// https://popularmechanics.com/ — 301 — 385 B — 8 ms — h2https://www.popularmechanics.com/www.popularmechanics.com/ https://www.popularmechanics.com/ — 200 — 110.0 KiB — 116 ms — h2https://www.popularmechanics.com/_assets/fre/scopes/hdm/_next/static/chunks/webpack-6a36650e379a6b61.jswww.popularmechanics.com/_assets/fr... https://www.popularmechanics.com/_assets/fre/scopes/hdm/_next/static/chunks/webpack-6a36650e379a6b61.js — 200 — 12.5 KiB — 14 ms — h2https://www.popularmechanics.com/_assets/fre/scopes/hdm/_next/static/chunks/framework-81603682134898a6.jswww.popularmechanics.com/_assets/fr... https://www.popularmechanics.com/_assets/fre/scopes/hdm/_next/static/chunks/framework-81603682134898a6.js — 200 — 13.9 KiB — 8 ms — h2https://www.popularmechanics.com/_assets/fre/scopes/hdm/_next/static/chunks/main-d2f686aa31e32b32.jswww.popularmechanics.com/_assets/fr... https://www.popularmechanics.com/_assets/fre/scopes/hdm/_next/static/chunks/main-d2f686aa31e32b32.js — 200 — 41.8 KiB — 24 ms — h2https://www.popularmechanics.com/_assets/fre/scopes/hdm/_next/static/chunks/pages/_templates/feed-2ac9a8ad0d959ea6.jswww.popularmechanics.com/_assets/fr... https://www.popularmechanics.com/_assets/fre/scopes/hdm/_next/static/chunks/pages/_templates/feed-2ac9a8ad0d959ea6.js — 200 — 14.9 KiB — 8 ms — h2https://www.popularmechanics.com/api/styles.css?id=b90dc2c0-9798-4080-af18-08c125fbc8da&type=section&source=section%3Acustomwww.popularmechanics.com/api/styles... https://www.popularmechanics.com/api/styles.css?id=b90dc2c0-9798-4080-af18-08c125fbc8da&type=section&source=section%3Acustom — 200 — 34.6 KiB — 27 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — 200 — 9.1 KiB — 100 ms — 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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 1180ms · 442KB · $22/mo
Unattributable
Other
Costly
Execution 379ms
Transfer 0 KB
Monthly Cost $7/mo
www.popularmechanics.com
Other
Costly
Execution 218ms
Transfer 15 KB
Monthly Cost $4/mo
www.popularmechanics.com
Other
Costly
Execution 217ms
Transfer 110 KB
Monthly Cost $4/mo
www.popularmechanics.com
Other
Optional
Execution 177ms
Transfer 14 KB
Monthly Cost $3/mo
www.popularmechanics.com
Other
Optional
Execution 68ms
Transfer 7 KB
Monthly Cost $1/mo
www.popularmechanics.com
Other
Optional
Execution 65ms
Transfer 108 KB
Unused 79%
Monthly Cost $1/mo
securepubads.g.doubleclick.net
Other
Optional
Execution 57ms
Transfer 188 KB
Unused 75%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 379ms and costs ~$7/month
  • www.popularmechanics.com adds 218ms and costs ~$4/month
  • www.popularmechanics.com adds 217ms and costs ~$4/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

Unattributable takes 379ms 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.popularmechanics.com takes 218ms 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.popularmechanics.com takes 217ms 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

79% of www.popularmechanics.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

75% of securepubads.g.doubleclick.net'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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