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https://stumbleupon.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
5
REVIEW
2
PASS
6
INFO
2

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

Mobile Desktop
99
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
89
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.
82
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.

476 ms

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

858 ms

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

0 ms

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

0.025

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

624 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

858 ms

Page Load Progression

510 ms
1.0 s
1.5 s
2.0 s
2.6 s
3.1 s
3.6 s
4.1 s
Checks
15
6 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
22.5 MB transferred, 42 requests
FIX
22.5 MB transferred, 42 requests
Critical::
Page weighs 20.1 MB (22.5 MB transferred)
Warning::
JavaScript is 1.1 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.1 MB
Info::
Fonts are 238 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 238 KB
Info::
42 HTTP requests
Info::
Estimated 4.7 g CO2 per page load
22.5 MB / 2.4 MB budget
22.5 MB transferred
42 requests
4.7 g CO2 per page load
Other 21.0 MiB 94%
JavaScript 1.1 MiB 5%
Fonts 238.2 KiB 1%
HTML 84.5 KiB 0%
CSS 47.6 KiB 0%
Images 9.7 KiB 0%
Other 3.4 KiB 0%
Other 764 B 0%
Other 558 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

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

D
Third-Party Impact
Action
99% third-party, 0 ms blocking
FIX
99% third-party, 0 ms blocking
Warning::
Third-party code accounts for 99% of page weight (22.2 MiB of 22.5 MiB)
Info::
Third-party blocking time is low (0 ms)
99%
First-party Third-party
F
JS Bundles
Action
16 scripts, 658 KB unused
FIX
16 scripts, 658 KB unused
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 177 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 177 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 177 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://accounts.google.com/gsi/client: 65 KB unused (68%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CZHC...: 61 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 658 KB
658 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js0 KB177 KB (49%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js362 KB177 KB (49%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js362 KB177 KB (49%)✓3rd
https://accounts.google.com/gsi/client96 KB65 KB (68%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-CZHCF49R69155 KB61 KB (40%)✓3rd
https://stumbleupon.com/_next/static/chunks/pages/_app-61b9c26c7e6cbfb3.js21 KB—✓1st
https://stumbleupon.com/_next/static/V9bWJWSlg6i9uqZ9inWcs/_buildManifest.js1 KB—✓1st
https://stumbleupon.com/_next/static/V9bWJWSlg6i9uqZ9inWcs/_ssgManifest.js0 KB—✓1st
https://stumbleupon.com/_next/static/chunks/pages/topic/%5Btopic%5D-c4ba61ade5f288ef.js3 KB—✓1st
https://www.google.com/recaptcha/enterprise.js?render=6LfobFMqAAAAAKTnW9p0QDKrpzZHN_77ZsuQ8Z861 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
42 resources · 22.5 MB · 658 KB savings available
FIX
42 resources · 22.5 MB · 658 KB savings available
Warning::
Page weight 21.5 MB over 1MB target
Got: 22.5 MB Expected: ≤ 1 MB
Info::
~658 KB of savings available
Warning::
18 third-party resources (99% of weight)
Info::
3 resources over 200KB
42 resources · 22.5 MiB · 18 third-party 21.5 MiB over 1MB target
Media 94% · 21.0 MiB
JavaScript 5% · 1.1 MiB
Font 1% · 238.2 KiB
Document 0% · 84.5 KiB
CSS 0% · 47.6 KiB
Image 0% · 12.0 KiB
Other 0% · 1.3 KiB

~658.1 KiB of savings available

Remove unused JavaScript: 658.1 KiB
D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: private, no-cache, no-store, max-age=0, must-revalidate
Info::
ETag present — enables conditional (304) responses
Cache-Control

private, no-cache, no-store, max-age=0, must-revalidate

DirectiveValueMeaning
private—Only browser cache, not CDN/proxy
no-cache—Cache but always revalidate first
no-store—Never cache this response
max-age0Cache for 0 seconds
must-revalidate—Must recheck with server after expiry
C
Image Optimization
Action
8 images, 0 KB saveable
REVIEW
8 images, 0 KB saveable
Warning::
https://stumbleupon.com/images/facebook.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://stumbleupon.com/images/twitter.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://stumbleupon.com/images/apple.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
8 images 10 KB
0 oversized -0 KB
8 legacy format
3 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

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+
JS Execution Cost
484ms total JS execution
PASS
484ms total JS execution
Info::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 188ms CPU time
Info::
Unattributable: 138ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-CZHC...: 87ms CPU time
Info::
https://stumbleupon.com/: 70ms CPU time
Warning::
Third-party scripts: 414ms (85% of total)

Main Thread Breakdown

Script Evaluation 56% Other 24% Style & Layout 9% Script Parsing & Compilation 8%
ScriptTotalScriptingParse/CompileParty
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js188ms164ms19ms3rd
Unattributable138ms3ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CZHCF49R6987ms68ms19ms3rd
https://stumbleupon.com/70ms1ms0ms1st
A+
Font Loading
5 fonts (238 KB)
PASS
5 fonts (238 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

238 KB total

Render-blocking

0

of 5

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 476 ms LCP 858 mshttps://stumbleupon.com/_next/static/media/SharpSansDispNo1-Bold.a6fa5a21.woff2SharpSansDispNo1-Bold.a... https://stumbleupon.com/_next/static/media/SharpSansDispNo1-Bold.a6fa5a21.woff2 — 50.1 KiB — 355 ms — font-display: swaphttps://stumbleupon.com/_next/static/media/SharpSansDispNo1-Medium.c5a7fc78.woff2SharpSansDispNo1-Medium... https://stumbleupon.com/_next/static/media/SharpSansDispNo1-Medium.c5a7fc78.woff2 — 49.3 KiB — 353 ms — font-display: swaphttps://stumbleupon.com/_next/static/media/SharpSansDispNo1-Semibold.67b590ff.woff2SharpSansDispNo1-Semibo... https://stumbleupon.com/_next/static/media/SharpSansDispNo1-Semibold.67b590ff.woff2 — 51.0 KiB — 104 ms — font-display: swaphttps://fonts.gstatic.com/s/googlesans/v62/4UaRrENHsxJlGDuGo1OIlJfC6l_24rlCK1Yo_Iq2vgCIhM907w.woff24UaRrENHsxJlGDuGo1OIlJf... https://fonts.gstatic.com/s/googlesans/v62/4UaRrENHsxJlGDuGo1OIlJfC6l_24rlCK1Yo_Iq2vgCIhM907w.woff2 — 53.9 KiB — 76 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 27 ms — font-display: swap
SharpSansDispNo1-Bold.a... woff2 swap
Size 50 KB
Load time 355 ms
Start 466 ms
Risk FOUT — text flashes from fallback to web font
SharpSansDispNo1-Medium... woff2 swap
Size 49 KB
Load time 353 ms
Start 468 ms
Risk FOUT — text flashes from fallback to web font
SharpSansDispNo1-Semibo... woff2 swap
Size 51 KB
Load time 104 ms
Start 910 ms
Risk FOUT — text flashes from fallback to web font
4UaRrENHsxJlGDuGo1OIlJf... woff2 swap
Size 54 KB
Load time 76 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 27 ms
Start 1.6 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
42 requests over 1768ms
INFO
0 ms 500 ms 1.0 s 1.5 s FCP 476 ms LCP 858 mshttps://stumbleupon.com// https://stumbleupon.com/ — 200 — 2.2 KiB — 311 ms — h2https://www.googletagmanager.com/gtag/js?id=G-CZHCF49R69www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-CZHCF49R69 — 200 — 154.6 KiB — 144 ms — h2https://stumbleupon.com/_next/static/css/abcf906f70706906.css/_next/static/css/abcf906f70706906.... https://stumbleupon.com/_next/static/css/abcf906f70706906.css — 200 — 4.0 KiB — 104 ms — h2https://stumbleupon.com/_next/static/css/71970a0172162ed1.css/_next/static/css/71970a0172162ed1.... https://stumbleupon.com/_next/static/css/71970a0172162ed1.css — 200 — 876 B — 105 ms — h2https://stumbleupon.com/images/mix_logo_white.svg/images/mix_logo_white.svg https://stumbleupon.com/images/mix_logo_white.svg — 200 — 1.3 KiB — 106 ms — h2https://stumbleupon.com/_next/static/chunks/webpack-ee7e63bc15b31913.js/_next/static/chunks/webpack-ee7e63... https://stumbleupon.com/_next/static/chunks/webpack-ee7e63bc15b31913.js — 200 — 1.0 KiB — 104 ms — h2https://stumbleupon.com/_next/static/chunks/framework-ecc4130bc7a58a64.js/_next/static/chunks/framework-ecc4... https://stumbleupon.com/_next/static/chunks/framework-ecc4130bc7a58a64.js — 200 — 44.5 KiB — 296 ms — h2https://stumbleupon.com/_next/static/chunks/main-e48048216a5fdbc9.js/_next/static/chunks/main-e48048216... https://stumbleupon.com/_next/static/chunks/main-e48048216a5fdbc9.js — 200 — 36.1 KiB — 494 ms — h2https://stumbleupon.com/_next/static/chunks/pages/_app-61b9c26c7e6cbfb3.js/_next/static/chunks/pages/_app-61b... https://stumbleupon.com/_next/static/chunks/pages/_app-61b9c26c7e6cbfb3.js — 200 — 20.9 KiB — 299 ms — h2https://stumbleupon.com/_next/static/chunks/pages/topic/%5Btopic%5D-c4ba61ade5f288ef.js/_next/static/chunks/pages/topic/%5... https://stumbleupon.com/_next/static/chunks/pages/topic/%5Btopic%5D-c4ba61ade5f288ef.js — 200 — 2.6 KiB — 494 ms — h2https://stumbleupon.com/_next/static/V9bWJWSlg6i9uqZ9inWcs/_buildManifest.js/_next/static/V9bWJWSlg6i9uqZ9inWcs... https://stumbleupon.com/_next/static/V9bWJWSlg6i9uqZ9inWcs/_buildManifest.js — 200 — 679 B — 298 ms — h2https://stumbleupon.com/_next/static/V9bWJWSlg6i9uqZ9inWcs/_ssgManifest.js/_next/static/V9bWJWSlg6i9uqZ9inWcs... https://stumbleupon.com/_next/static/V9bWJWSlg6i9uqZ9inWcs/_ssgManifest.js — 200 — 318 B — 494 ms — h2https://stumbleupon.com/images/logo.png/images/logo.png https://stumbleupon.com/images/logo.png — 200 — 2.2 KiB — 196 ms — h2https://assets.mix.com/static/onboarding/5.8_version_11_1.mp4assets.mix.com/static/onboarding/5.... https://assets.mix.com/static/onboarding/5.8_version_11_1.mp4 — 206 — 21.0 MiB — 58 ms — h2https://stumbleupon.com/_next/static/media/SharpSansDispNo1-Bold.a6fa5a21.woff2/_next/static/media/SharpSansDispNo... https://stumbleupon.com/_next/static/media/SharpSansDispNo1-Bold.a6fa5a21.woff2 — 200 — 50.1 KiB — 355 ms — h2https://stumbleupon.com/_next/static/media/SharpSansDispNo1-Medium.c5a7fc78.woff2/_next/static/media/SharpSansDispNo... https://stumbleupon.com/_next/static/media/SharpSansDispNo1-Medium.c5a7fc78.woff2 — 200 — 49.3 KiB — 353 ms — h2https://region1.analytics.google.com/g/collect?v=2&tid=G-CZHCF49R69&gtm=45je64h1v868420704za200zd868420704&_p=1776799112792&_gaz=1&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&_eu=AAAAAGA&are=1&cid=1297259430.1776799113&frm=0&pscdl=noapi&rcb=19&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&gaf=2&_s=1&tag_exp=0~115938466~115938469~117266400&dp=%2F&sid=1776799113&sct=1&seg=0&dl=https%3A%2F%2Fstumbleupon.com%2F&dt=StumbleUpon&en=page_view&_fv=1&_nsi=1&_ss=1&_ee=1&tfd=564region1.analytics.google.com/g/coll... https://region1.analytics.google.com/g/collect?v=2&tid=G-CZHCF49R69&gtm=45je64h1v868420704za200zd868420704&_p=1776799112792&_gaz=1&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&_eu=AAAAAGA&are=1&cid=1297259430.1776799113&frm=0&pscdl=noapi&rcb=19&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&gaf=2&_s=1&tag_exp=0~115938466~115938469~117266400&dp=%2F&sid=1776799113&sct=1&seg=0&dl=https%3A%2F%2Fstumbleupon.com%2F&dt=StumbleUpon&en=page_view&_fv=1&_nsi=1&_ss=1&_ee=1&tfd=564 — 204 — 549 B — 71 ms — h2https://stats.g.doubleclick.net/g/collect?v=2&tid=G-CZHCF49R69&cid=1297259430.1776799113&gtm=45je64h1v868420704za200zd868420704&rcb=19&aip=1&dma=1&dma_cps=a&gcd=13l3l3l2l1l1&npa=1&frm=0&tag_exp=0~115938466~115938469~117266400stats.g.doubleclick.net/g/collect?v... https://stats.g.doubleclick.net/g/collect?v=2&tid=G-CZHCF49R69&cid=1297259430.1776799113&gtm=45je64h1v868420704za200zd868420704&rcb=19&aip=1&dma=1&dma_cps=a&gcd=13l3l3l2l1l1&npa=1&frm=0&tag_exp=0~115938466~115938469~117266400 — 204 — 558 B — 75 ms — h2https://www.google.es/ads/ga-audiences?v=1&t=sr&slf_rd=1&_r=4&tid=G-CZHCF49R69&cid=1297259430.1776799113&gtm=45je64h1v868420704za200zd868420704&rcb=19&aip=1&dma=1&dma_cps=a&gcd=13l3l3l2l1l1&npa=1&frm=0&tag_exp=0~115938466~115938469~117266400&z=928902844www.google.es/ads/ga-audiences?v=1&... https://www.google.es/ads/ga-audiences?v=1&t=sr&slf_rd=1&_r=4&tid=G-CZHCF49R69&cid=1297259430.1776799113&gtm=45je64h1v868420704za200zd868420704&rcb=19&aip=1&dma=1&dma_cps=a&gcd=13l3l3l2l1l1&npa=1&frm=0&tag_exp=0~115938466~115938469~117266400&z=928902844 — 200 — 408 B — 80 ms — h2https://accounts.google.com/gsi/clientaccounts.google.com/gsi/client https://accounts.google.com/gsi/client — 200 — 96.4 KiB — 125 ms — h2https://www.google.com/recaptcha/enterprise.js?render=6LfobFMqAAAAAKTnW9p0QDKrpzZHN_77ZsuQ8Z86www.google.com/recaptcha/enterprise... https://www.google.com/recaptcha/enterprise.js?render=6LfobFMqAAAAAKTnW9p0QDKrpzZHN_77ZsuQ8Z86 — 200 — 1.1 KiB — 65 ms — h3https://stumbleupon.com/images/facebook.svg/images/facebook.svg https://stumbleupon.com/images/facebook.svg — 200 — 629 B — 109 ms — h2https://stumbleupon.com/images/twitter.svg/images/twitter.svg https://stumbleupon.com/images/twitter.svg — 200 — 960 B — 110 ms — h2https://stumbleupon.com/images/apple.svg/images/apple.svg https://stumbleupon.com/images/apple.svg — 200 — 793 B — 122 ms — h2https://stumbleupon.com/images/qr.svg/images/qr.svg https://stumbleupon.com/images/qr.svg — 200 — 1.2 KiB — 122 ms — h2https://stumbleupon.com/favicon.ico/favicon.ico https://stumbleupon.com/favicon.ico — 200 — 2.3 KiB — 105 ms — h2https://stumbleupon.com/_next/data/V9bWJWSlg6i9uqZ9inWcs/about.json/_next/data/V9bWJWSlg6i9uqZ9inWcs/a... https://stumbleupon.com/_next/data/V9bWJWSlg6i9uqZ9inWcs/about.json — 200 — 215 B — 114 ms — h2https://stumbleupon.com/_next/static/chunks/pages/about-3b5a9744436afaf3.js/_next/static/chunks/pages/about-3b... https://stumbleupon.com/_next/static/chunks/pages/about-3b5a9744436afaf3.js — 200 — 1.2 KiB — 103 ms — h2https://stumbleupon.com/_next/static/media/SharpSansDispNo1-Semibold.67b590ff.woff2/_next/static/media/SharpSansDispNo... https://stumbleupon.com/_next/static/media/SharpSansDispNo1-Semibold.67b590ff.woff2 — 200 — 51.0 KiB — 104 ms — h2https://stumbleupon.com/_next/static/css/71970a0172162ed1.css/_next/static/css/71970a0172162ed1.... https://stumbleupon.com/_next/static/css/71970a0172162ed1.css — 200 — 0 B — 3 ms — h2
0 ms 500 ms 1.0 s 1.5 s FCP 476 ms LCP 858 mshttps://stumbleupon.com// https://stumbleupon.com/ — 200 — 2.2 KiB — 311 ms — h2https://www.googletagmanager.com/gtag/js?id=G-CZHCF49R69www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-CZHCF49R69 — 200 — 154.6 KiB — 144 ms — h2https://stumbleupon.com/_next/static/css/abcf906f70706906.css/_next/static/css/abcf906f70706906.... https://stumbleupon.com/_next/static/css/abcf906f70706906.css — 200 — 4.0 KiB — 104 ms — h2https://stumbleupon.com/_next/static/css/71970a0172162ed1.css/_next/static/css/71970a0172162ed1.... https://stumbleupon.com/_next/static/css/71970a0172162ed1.css — 200 — 876 B — 105 ms — h2https://stumbleupon.com/images/mix_logo_white.svg/images/mix_logo_white.svg https://stumbleupon.com/images/mix_logo_white.svg — 200 — 1.3 KiB — 106 ms — h2https://stumbleupon.com/_next/static/chunks/webpack-ee7e63bc15b31913.js/_next/static/chunks/webpack-ee7e63... 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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
85% of JavaScript execution is third-party
First-party Third-party 414ms · 155KB · $6/mo
www.gstatic.com
Other
Optional
Execution 188ms
Transfer 0 KB
Unused 49%
Monthly Cost $2/mo
Unattributable
Other
Optional
Execution 138ms
Transfer 0 KB
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 87ms
Transfer 155 KB
Unused 40%
Monthly Cost $1/mo

85% 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

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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