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https://popularmechanics.com

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
5
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
39
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.

3.57 s

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

7.21 s

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

1.50 s

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

0.009

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

5.38 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.

16.09 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
7 PASS 3 REVIEW 5 FIX
D
Page Weight Budget
Action
2.4 MB transferred, 126 requests
FIX
2.4 MB transferred, 126 requests
Info::
Page weighs 7.5 MB (2.4 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::
126 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.51 g CO2 per page load
2.4 MB / 2.4 MB budget
2.4 MB transferred
126 requests
0.51 g CO2 per page load
JavaScript 1.2 MiB 51%
Images 520.3 KiB 21%
Other 233.7 KiB 9%
Other 164.8 KiB 7%
Fonts 114.4 KiB 5%
HTML 110.0 KiB 4%
CSS 76.5 KiB 3%
Other 6.1 KiB 0%
Other 0 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

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 (2.4 MiB of 2.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
6158ms total JS execution
FIX
6158ms total JS execution
Warning::
Unattributable: 1453ms CPU time
Warning::
https://www.popularmechanics.com/_assets/fre/scope...: 1005ms CPU time
Warning::
https://www.popularmechanics.com/: 888ms CPU time
Warning::
https://www.popularmechanics.com/_assets/fre/scope...: 790ms CPU time
Info::
https://www.popularmechanics.com/_assets/fre/scope...: 210ms CPU time
Warning::
Third-party scripts: 6158ms (100% of total)

Main Thread Breakdown

Script Evaluation 62% Other 16% Style & Layout 11% Script Parsing & Compilation 6%
ScriptTotalScriptingParse/CompileParty
Unattributable1453ms581ms0ms3rd
https://www.popularmechanics.com/_assets/fre/scopes/hdm/_next/static/chunks/pages/_templates/feed-2ac9a8ad0d959ea6.js1005ms976ms5ms3rd
https://www.popularmechanics.com/888ms37ms5ms3rd
https://www.popularmechanics.com/_assets/fre/scopes/hdm/_next/static/chunks/framework-81603682134898a6.js790ms662ms3ms3rd
https://www.popularmechanics.com/_assets/fre/scopes/hdm/_next/static/chunks/74394.3f0caca7d935bb63.js210ms183ms2ms3rd
https://cdn.cookielaw.org/scripttemplates/202602.1.0/otBannerSdk.js197ms111ms58ms3rd
https://www.popularmechanics.com/_assets/fre/scopes/hdm/_next/static/chunks/32567.77c6be1206ee852f.js184ms182ms1ms3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js175ms125ms46ms3rd
https://www.popularmechanics.com/_assets/fre/scopes/hdm/_next/static/chunks/45689.b575763ebb590129.js132ms126ms1ms3rd
https://www.popularmechanics.com/_assets/moapt/2.437.0/moapt-bundle-hdm.js122ms97ms15ms3rd

Showing top 10 of 21 scripts

D
JS Bundles
Action
77 scripts, 493 KB unused
FIX
77 scripts, 493 KB unused
Warning::
https://securepubads.g.doubleclick.net/pagead/mana...: 142 KB unused (76%)
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 (90%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 493 KB
493 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js188 KB142 KB (76%)✓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 (90%)✓3rd
https://www.popularmechanics.com/_assets/moapt/2.437.0/moapt-bundle-hdm.js58 KB43 KB (76%)✓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/70150-067bd71e7388afdb.js15 KB—✓3rd
https://securepubads.g.doubleclick.net/tag/js/gpt.js34 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
126 resources · 2.4 MB · 493 KB savings available
FIX
126 resources · 2.4 MB · 493 KB savings available
Warning::
Page weight 1.4 MB over 1MB target
Got: 2.4 MB Expected: ≤ 1 MB
Info::
~493 KB of savings available
Warning::
125 third-party resources (100% of weight)
126 resources · 2.4 MiB · 125 third-party 1.4 MiB over 1MB target
JavaScript 52% · 1.3 MiB
Image 21% · 525.5 KiB
Other 10% · 255.4 KiB
Document 9% · 220.9 KiB
Font 5% · 114.4 KiB
CSS 3% · 81.2 KiB

~492.6 KiB of savings available

Remove unused JavaScript: 492.6 KiB
C
Image Optimization
Action
25 images, 0 KB saveable
REVIEW
25 images, 0 KB saveable
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/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/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/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/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/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/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/fbee59... 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/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/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/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/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/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/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/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/finger... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
25 images 520 KB
0 oversized -0 KB
4 legacy format
17 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

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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 3.6 s LCP 7.2 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 — 23 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 — 12 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 — 12 ms — font-display: swap
RobotoMono.b9f4a81.woff2 woff2 swap
Size 33 KB
Load time 23 ms
Start 57 ms
Risk FOUT — text flashes from fallback to web font
inter-v3-latin-700.8b80... woff2 swap
Size 18 KB
Load time 12 ms
Start 211 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 211 ms
Risk FOUT — text flashes from fallback to web font
UnitedSansCdBk.cde089b.... woff2 swap
Size 42 KB
Load time 12 ms
Start 212 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
2 hints, 0 missing preconnects
PASS
2 hints, 0 missing preconnects
Info::
Page uses 2 resource hint(s)

Current Resource Hints

preconnect
—
preload
1
dns-prefetch
—
prefetch
1

2 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
Network Waterfall
126 requests over 1826ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 3.6 s LCP 7.2 shttps://popularmechanics.com// https://popularmechanics.com/ — 301 — 386 B — 12 ms — h2https://www.popularmechanics.com/www.popularmechanics.com/ https://www.popularmechanics.com/ — 200 — 110.0 KiB — 14 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 — 13.0 KiB — 11 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 — 13.7 KiB — 10 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 — 41.5 KiB — 17 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 — 14.7 KiB — 14 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 — 34.7 KiB — 16 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — 200 — 9.1 KiB — 122 ms — h2https://www.popularmechanics.com/_assets/moapt/2.437.0/moapt-data.jswww.popularmechanics.com/_assets/mo... https://www.popularmechanics.com/_assets/moapt/2.437.0/moapt-data.js — 200 — 53.4 KiB — 28 ms — h3https://www.popularmechanics.com/_assets/moapt/2.437.0/moapt-bundle-hdm.jswww.popularmechanics.com/_assets/mo... https://www.popularmechanics.com/_assets/moapt/2.437.0/moapt-bundle-hdm.js — 200 — 57.7 KiB — 23 ms — h3https://www.popularmechanics.com/_assets/design-tokens/popularmechanics/static/fonts/RobotoMono.b9f4a81.woff2www.popularmechanics.com/_assets/de... https://www.popularmechanics.com/_assets/design-tokens/popularmechanics/static/fonts/RobotoMono.b9f4a81.woff2 — 200 — 32.7 KiB — 23 ms — h3https://www.popularmechanics.com/_assets/design-tokens/popularmechanics/static/images/logos/logo.a957255.svg?primary=%25231c6a65www.popularmechanics.com/_assets/de... 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h3https://www.popularmechanics.com/_assets/fre/scopes/hdm/_next/static/chunks/78999.a21b4fe0557146d0.jswww.popularmechanics.com/_assets/fr... https://www.popularmechanics.com/_assets/fre/scopes/hdm/_next/static/chunks/78999.a21b4fe0557146d0.js — 200 — 5.6 KiB — 45 ms — h3https://www.popularmechanics.com/_assets/fre/scopes/hdm/_next/static/chunks/64788.07bc01df611beb78.jswww.popularmechanics.com/_assets/fr... https://www.popularmechanics.com/_assets/fre/scopes/hdm/_next/static/chunks/64788.07bc01df611beb78.js — 200 — 2.1 KiB — 27 ms — h3https://www.popularmechanics.com/_assets/fre/scopes/hdm/_next/static/chunks/30722.305d6f233abcb73d.jswww.popularmechanics.com/_assets/fr... https://www.popularmechanics.com/_assets/fre/scopes/hdm/_next/static/chunks/30722.305d6f233abcb73d.js — 200 — 2.8 KiB — 27 ms — h3https://www.popularmechanics.com/_assets/fre/scopes/hdm/_next/static/chunks/pages/_app-4f9afbaf363dcc46.jswww.popularmechanics.com/_assets/fr... 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https://heimdall.hearstapps.com/voltron — 200 — 72 B — 130 ms — h2https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.jssecurepubads.g.doubleclick.net/page... https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js — 200 — 187.7 KiB — 72 ms — h3https://cdn.cookielaw.org/consent/4a26cfdb-2c0c-40f8-972f-558d4bebc170/01965dc6-7616-7f64-a40f-9614ab143e38/en.jsoncdn.cookielaw.org/consent/4a26cfdb-... https://cdn.cookielaw.org/consent/4a26cfdb-2c0c-40f8-972f-558d4bebc170/01965dc6-7616-7f64-a40f-9614ab143e38/en.json — 200 — 56.1 KiB — 69 ms — h2https://cdn.cookielaw.org/vendorlist/iab2V2Data.jsoncdn.cookielaw.org/vendorlist/iab2V2... https://cdn.cookielaw.org/vendorlist/iab2V2Data.json — 200 — 86.8 KiB — 54 ms — h2https://cdn.cookielaw.org/vendorlist/googleData.jsoncdn.cookielaw.org/vendorlist/google... https://cdn.cookielaw.org/vendorlist/googleData.json — 200 — 19.4 KiB — 54 ms — h2https://cdn.cookielaw.org/scripttemplates/202602.1.0/otTCF.jscdn.cookielaw.org/scripttemplates/2... https://cdn.cookielaw.org/scripttemplates/202602.1.0/otTCF.js — 200 — 17.7 KiB — 29 ms — h2https://securepubads.g.doubleclick.net/pagead/managed/dict/m202604210101/gptsecurepubads.g.doubleclick.net/page... https://securepubads.g.doubleclick.net/pagead/managed/dict/m202604210101/gpt — 200 — 23.0 KiB — 38 ms — h3https://cdn.cookielaw.org/scripttemplates/202602.1.0/assets/otCenterRounded.jsoncdn.cookielaw.org/scripttemplates/2... https://cdn.cookielaw.org/scripttemplates/202602.1.0/assets/otCenterRounded.json — 200 — 3.0 KiB — 31 ms — h2https://cdn.cookielaw.org/scripttemplates/202602.1.0/assets/otCommonStyles.csscdn.cookielaw.org/scripttemplates/2... https://cdn.cookielaw.org/scripttemplates/202602.1.0/assets/otCommonStyles.css — 200 — 4.7 KiB — 32 ms — h2https://c.amazon-adsystem.com/aax2/apstag.jsc.amazon-adsystem.com/aax2/apstag.j... https://c.amazon-adsystem.com/aax2/apstag.js — 200 — 91.0 KiB — 112 ms — h2https://www.popularmechanics.com/_assets/design-tokens/popularmechanics/static/images/logos/logo.a957255.svgwww.popularmechanics.com/_assets/de... https://www.popularmechanics.com/_assets/design-tokens/popularmechanics/static/images/logos/logo.a957255.svg — 200 — 2.7 KiB — 6 ms — h3https://c.amazon-adsystem.com/bao-csm/aps-comm/aps_csm.jsc.amazon-adsystem.com/bao-csm/aps-c... https://c.amazon-adsystem.com/bao-csm/aps-comm/aps_csm.js — 200 — 3.1 KiB — 56 ms — h2https://www.popularmechanics.com/_assets/fre/scopes/hdm/_next/static/media/tag-manager.script.96237b8b.jswww.popularmechanics.com/_assets/fr... https://www.popularmechanics.com/_assets/fre/scopes/hdm/_next/static/media/tag-manager.script.96237b8b.js — 200 — 1.0 KiB — 4 ms — h3https://www.popularmechanics.com/_assets/design-tokens/popularmechanics/static/images/favicon.ee0d102.icowww.popularmechanics.com/_assets/de... https://www.popularmechanics.com/_assets/design-tokens/popularmechanics/static/images/favicon.ee0d102.ico — 200 — 4.5 KiB — 4 ms — h3https://nexus.ensighten.com/hearst/mag/Bootstrap.jsnexus.ensighten.com/hearst/mag/Boot... https://nexus.ensighten.com/hearst/mag/Bootstrap.js — 200 — 18.7 KiB — 97 ms — h2https://nexus.ensighten.com/hearst/mag/serverComponent.php?namespace=Bootstrapper&staticJsPath=nexus.ensighten.com/hearst/mag/code/&ClientID=109&PageID=https%3A%2F%2Fwww.popularmechanics.com%2F%3Fgdpr%3Dtrue%26selfhostedads%3Don%26template%3DHomepage%26brand%3Dpopularmechanics%26locale%3Den-usnexus.ensighten.com/hearst/mag/serv... https://nexus.ensighten.com/hearst/mag/serverComponent.php?namespace=Bootstrapper&staticJsPath=nexus.ensighten.com/hearst/mag/code/&ClientID=109&PageID=https%3A%2F%2Fwww.popularmechanics.com%2F%3Fgdpr%3Dtrue%26selfhostedads%3Don%26template%3DHomepage%26brand%3Dpopularmechanics%26locale%3Den-us — 200 — 621 B — 72 ms — h3https://nexus.ensighten.com/hearst/mag/code/8a68658ae16f17a83a49d4d4959ebbbf.js?conditionId0=256210nexus.ensighten.com/hearst/mag/code... https://nexus.ensighten.com/hearst/mag/code/8a68658ae16f17a83a49d4d4959ebbbf.js?conditionId0=256210 — 200 — 1.3 KiB — 21 ms — h2https://nexus.ensighten.com/hearst/mag/code/d093f738bcba5116482bc651285bf168.js?conditionId0=4954687nexus.ensighten.com/hearst/mag/code... https://nexus.ensighten.com/hearst/mag/code/d093f738bcba5116482bc651285bf168.js?conditionId0=4954687 — 200 — 1.9 KiB — 21 ms — h2https://nexus.ensighten.com/hearst/mag/code/2f971b00a5adab2f667ff4fe2e3f9d3e.js?conditionId0=422740nexus.ensighten.com/hearst/mag/code... https://nexus.ensighten.com/hearst/mag/code/2f971b00a5adab2f667ff4fe2e3f9d3e.js?conditionId0=422740 — 200 — 1.1 KiB — 22 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 6158ms · 936KB · $115/mo
Unattributable
Other
Costly
Execution 1453ms
Transfer 0 KB
Monthly Cost $27/mo
www.popularmechanics.com
Other
Costly
Execution 1005ms
Transfer 15 KB
Monthly Cost $19/mo
www.popularmechanics.com
Other
Costly
Execution 888ms
Transfer 110 KB
Monthly Cost $17/mo
www.popularmechanics.com
Other
Costly
Execution 790ms
Transfer 14 KB
Monthly Cost $15/mo
www.popularmechanics.com
Other
Costly
Execution 210ms
Transfer 7 KB
Monthly Cost $4/mo
OneTrust
Consent
Essential
Execution 197ms
Transfer 129 KB
Unused 57%
Monthly Cost $4/mo
www.popularmechanics.com
Other
Optional
Execution 184ms
Transfer 4 KB
Monthly Cost $3/mo
securepubads.g.doubleclick.net
Other
Optional
Execution 175ms
Transfer 188 KB
Unused 76%
Monthly Cost $3/mo
www.popularmechanics.com
Other
Optional
Execution 132ms
Transfer 4 KB
Monthly Cost $2/mo
www.popularmechanics.com
Other
Optional
Execution 122ms
Transfer 58 KB
Unused 76%
Monthly Cost $2/mo
www.popularmechanics.com
Other
Optional
Execution 117ms
Transfer 108 KB
Unused 79%
Monthly Cost $2/mo
www.popularmechanics.com
Other
Optional
Execution 117ms
Transfer 7 KB
Monthly Cost $2/mo
www.popularmechanics.com
Other
Optional
Execution 115ms
Transfer 5 KB
Monthly Cost $2/mo
c.amazon-adsystem.com
Other
Optional
Execution 113ms
Transfer 91 KB
Unused 63%
Monthly Cost $2/mo
OneTrust
Consent
Essential
Execution 96ms
Transfer 9 KB
Monthly Cost $2/mo
www.popularmechanics.com
Other
Optional
Execution 96ms
Transfer 2 KB
Monthly Cost $2/mo
www.popularmechanics.com
Other
Optional
Execution 83ms
Transfer 43 KB
Unused 49%
Monthly Cost $2/mo
www.popularmechanics.com
Other
Optional
Execution 79ms
Transfer 42 KB
Unused 56%
Monthly Cost $1/mo
securepubads.g.doubleclick.net
Other
Optional
Execution 74ms
Transfer 34 KB
Monthly Cost $1/mo
www.popularmechanics.com
Other
Optional
Execution 59ms
Transfer 13 KB
Monthly Cost $1/mo
www.popularmechanics.com
Other
Optional
Execution 52ms
Transfer 53 KB
Unused 90%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 1453ms and costs ~$27/month
  • www.popularmechanics.com adds 1005ms and costs ~$19/month
  • www.popularmechanics.com adds 888ms and costs ~$17/month
  • www.popularmechanics.com adds 790ms and costs ~$15/month
  • www.popularmechanics.com adds 210ms 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 1453ms 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 1005ms 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 888ms 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 790ms 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 210ms 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

57% of OneTrust'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

76% 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

76% 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

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

63% of c.amazon-adsystem.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

56% 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

90% 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

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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