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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
69
GRADE
D
FIX
5
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
85
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
85
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.

927 ms

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

2.13 s

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

74 ms

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

0.001

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

1.89 s

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

2.15 s

Page Load Progression

525 ms
1.1 s
1.6 s
2.1 s
2.6 s
3.2 s
3.7 s
4.2 s
Checks
15
5 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
4.7 MB transferred, 63 requests
FIX
4.7 MB transferred, 63 requests
Critical::
Page weighs 7.6 MB (4.7 MB transferred)
Warning::
Images are 2.0 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.0 MB
Warning::
JavaScript is 887 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 887 KB
Info::
63 HTTP requests
Info::
Estimated 0.99 g CO2 per page load
4.7 MB / 2.4 MB budget
4.7 MB transferred
63 requests
0.99 g CO2 per page load
Images 2.0 MiB 42%
Other 1.8 MiB 37%
JavaScript 886.7 KiB 18%
CSS 37.4 KiB 1%
Fonts 32.4 KiB 1%
Other 26.2 KiB 1%
HTML 7.4 KiB 0%
Other 7.2 KiB 0%
0 2.4 MB 4.9 MB
Over budget

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 (4.7 MiB of 4.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
9 scripts, 410 KB unused
FIX
9 scripts, 410 KB unused
Warning::
https://fast.wistia.com/assets/external/engines/hl...: 87 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://fast.wistia.com/assets/external/E-v1.js: 79 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-MNM...: 75 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.cookielaw.org/scripttemplates/202508.1...: 74 KB unused (62%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.outbrain.com/script.js?version=4d2133b...: 73 KB unused (71%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 410 KB
410 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://fast.wistia.com/assets/external/engines/hls_video.js@4a7b909604c9049f14b616b11446fa0e8efdec42159 KB87 KB (55%)✓3rd
https://fast.wistia.com/assets/external/E-v1.js162 KB79 KB (49%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MNMBTC182 KB75 KB (41%)✓3rd
https://cdn.cookielaw.org/scripttemplates/202508.1.0/otBannerSdk.js120 KB74 KB (62%)✓3rd
https://www.outbrain.com/script.js?version=4d2133b27bf2105 KB73 KB (71%)✓3rd
https://browser.sentry-cdn.com/9.6.1/bundle.min.js25 KB21 KB (86%)✓3rd
https://www.outbrain.com/script.js105 KB—✓3rd
https://cdn.cookielaw.org/scripttemplates/otSDKStub.js?did=aa0c1c56-98fd-43ad-a88c-e158ec6af71c9 KB—✓3rd
https://fast.wistia.com/assets/external/playPauseLoadingControl.js@4a7b909604c9049f14b616b11446fa0e8efdec4220 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
63 resources · 4.7 MB · 410 KB savings available
FIX
63 resources · 4.7 MB · 410 KB savings available
Warning::
Page weight 3.7 MB over 1MB target
Got: 4.7 MB Expected: ≤ 1 MB
Info::
~410 KB of savings available
Warning::
62 third-party resources (100% of weight)
Info::
8 resources over 200KB
63 resources · 4.7 MiB · 62 third-party 3.7 MiB over 1MB target
Image 42% · 2.0 MiB
Media 37% · 1.8 MiB
JavaScript 18% · 886.7 KiB
CSS 1% · 41.9 KiB
Font 1% · 32.4 KiB
Other 1% · 28.4 KiB
Document 0% · 7.4 KiB

~409.8 KiB of savings available

Remove unused JavaScript: 409.8 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

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

C
Image Optimization
Action
26 images, 0 KB saveable
REVIEW
26 images, 0 KB saveable
Warning::
https://www.outbrain.com/images/logo-ob-direct.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.outbrain.com/images/pages/home/perform... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.outbrain.com/images/pages/home/perform... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.outbrain.com/images/pages/home/perform... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.outbrain.com/images/pages/home/perform... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.outbrain.com/images/pages/home/bottom-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
26 images 2.0 MB
0 oversized -0 KB
24 legacy format
6 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

C
JS Execution Cost
Action
1078ms total JS execution
REVIEW
1078ms total JS execution
Warning::
https://fast.wistia.com/assets/external/E-v1.js: 373ms CPU time
Info::
https://fast.wistia.com/assets/external/engines/hl...: 181ms CPU time
Info::
Unattributable: 158ms CPU time
Info::
https://www.outbrain.com/: 119ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-MNM...: 104ms CPU time
Warning::
Third-party scripts: 1078ms (100% of total)

Main Thread Breakdown

Script Evaluation 59% Other 19% Style & Layout 11% Script Parsing & Compilation 8%
ScriptTotalScriptingParse/CompileParty
https://fast.wistia.com/assets/external/E-v1.js373ms298ms32ms3rd
https://fast.wistia.com/assets/external/engines/hls_video.js@4a7b909604c9049f14b616b11446fa0e8efdec42181ms149ms1ms3rd
Unattributable158ms29ms0ms3rd
https://www.outbrain.com/119ms2ms1ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MNMBTC104ms82ms20ms3rd
https://www.outbrain.com/script.js?version=4d2133b27bf290ms54ms11ms3rd
https://cdn.cookielaw.org/scripttemplates/202508.1.0/otBannerSdk.js53ms21ms18ms3rd
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+
Font Loading
2 fonts (32 KB)
PASS
2 fonts (32 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

32 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 500 ms 1.0 s 1.5 s 2.0 s FCP 927 ms LCP 2.1 shttps://www.outbrain.com/fonts/icomoon/icomoon.woff2icomoon.woff2 https://www.outbrain.com/fonts/icomoon/icomoon.woff2 — 5.7 KiB — 28 ms — font-display: swaphttps://fonts.gstatic.com/s/plusjakartasans/v12/LDIoaomQNQcsA88c7O9yZ4KMCoOg4Ko20yygg_vb.woff2LDIoaomQNQcsA88c7O9yZ4K... https://fonts.gstatic.com/s/plusjakartasans/v12/LDIoaomQNQcsA88c7O9yZ4KMCoOg4Ko20yygg_vb.woff2 — 26.7 KiB — 8 ms — font-display: swap
icomoon.woff2 woff2 swap
Size 6 KB
Load time 28 ms
Start 240 ms
Risk FOUT — text flashes from fallback to web font
LDIoaomQNQcsA88c7O9yZ4K... woff2 swap
Size 27 KB
Load time 8 ms
Start 535 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
63 requests over 1842ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 927 ms LCP 2.1 shttps://outbrain.com// https://outbrain.com/ — 301 — 182 B — 11 ms — h2https://www.outbrain.com/www.outbrain.com/ https://www.outbrain.com/ — 200 — 7.4 KiB — 217 ms — http/1.1https://www.outbrain.com/style.csswww.outbrain.com/style.css https://www.outbrain.com/style.css — 200 — 18.2 KiB — 26 ms — http/1.1https://www.outbrain.com/script.jswww.outbrain.com/script.js https://www.outbrain.com/script.js — 200 — 104.6 KiB — 39 ms — http/1.1https://www.outbrain.com/fonts/icomoon/icomoon.woff2www.outbrain.com/fonts/icomoon/icom... https://www.outbrain.com/fonts/icomoon/icomoon.woff2 — 200 — 5.7 KiB — 28 ms — http/1.1https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:ital,wght@0,200..800;1,200..800&display=swapfonts.googleapis.com/css2?family=Pl... https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:ital,wght@0,200..800;1,200..800&display=swap — 200 — 1.1 KiB — 142 ms — h2https://www.outbrain.com/style.css?version=4d2133b27bf2www.outbrain.com/style.css?version=... https://www.outbrain.com/style.css?version=4d2133b27bf2 — 200 — 18.2 KiB — 24 ms — http/1.1https://www.outbrain.com/images/logo-ob-direct.pngwww.outbrain.com/images/logo-ob-dir... https://www.outbrain.com/images/logo-ob-direct.png — 200 — 31.7 KiB — 27 ms — http/1.1https://www.outbrain.com/images/pages/home/performance__1.pngwww.outbrain.com/images/pages/home/... https://www.outbrain.com/images/pages/home/performance__1.png — 200 — 58.6 KiB — 27 ms — http/1.1https://fast.wistia.com/assets/external/E-v1.jsfast.wistia.com/assets/external/E-v... https://fast.wistia.com/assets/external/E-v1.js — 200 — 162.1 KiB — 55 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-MNMBTCwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-MNMBTC — 200 — 182.2 KiB — 309 ms — h2https://www.outbrain.com/images/pages/home/performance__2.pngwww.outbrain.com/images/pages/home/... https://www.outbrain.com/images/pages/home/performance__2.png — 200 — 409.2 KiB — 32 ms — http/1.1https://www.outbrain.com/images/pages/home/performance__3.pngwww.outbrain.com/images/pages/home/... https://www.outbrain.com/images/pages/home/performance__3.png — 200 — 53.7 KiB — 14 ms — http/1.1https://www.outbrain.com/images/pages/home/performance__4.pngwww.outbrain.com/images/pages/home/... https://www.outbrain.com/images/pages/home/performance__4.png — 200 — 36.7 KiB — 26 ms — http/1.1https://www.outbrain.com/assets/new-banner-close.pngwww.outbrain.com/assets/new-banner-... https://www.outbrain.com/assets/new-banner-close.png — 200 — 1.1 KiB — 7 ms — http/1.1https://www.outbrain.com/images/pages/home/ecoflow-circle.pngwww.outbrain.com/images/pages/home/... https://www.outbrain.com/images/pages/home/ecoflow-circle.png — 200 — 4.0 KiB — 20 ms — http/1.1https://www.outbrain.com/images/pages/home/torras-circle.pngwww.outbrain.com/images/pages/home/... https://www.outbrain.com/images/pages/home/torras-circle.png — 200 — 6.5 KiB — 6 ms — http/1.1https://www.outbrain.com/images/pages/home/hipto-circle.pngwww.outbrain.com/images/pages/home/... https://www.outbrain.com/images/pages/home/hipto-circle.png — 200 — 6.3 KiB — 14 ms — http/1.1https://www.outbrain.com/images/pages/home/bottom-cta-image.webpwww.outbrain.com/images/pages/home/... https://www.outbrain.com/images/pages/home/bottom-cta-image.webp — 200 — 162.8 KiB — 23 ms — http/1.1https://www.outbrain.com/script.js?version=4d2133b27bf2www.outbrain.com/script.js?version=... https://www.outbrain.com/script.js?version=4d2133b27bf2 — 200 — 104.6 KiB — 23 ms — http/1.1https://browser.sentry-cdn.com/9.6.1/bundle.min.jsbrowser.sentry-cdn.com/9.6.1/bundle... https://browser.sentry-cdn.com/9.6.1/bundle.min.js — 200 — 24.8 KiB — 18 ms — h2https://www.outbrain.com/assets/top-logo.pngwww.outbrain.com/assets/top-logo.pn... https://www.outbrain.com/assets/top-logo.png — 200 — 3.0 KiB — 4 ms — http/1.1https://www.outbrain.com/images/pages/home/hero-bg.pngwww.outbrain.com/images/pages/home/... https://www.outbrain.com/images/pages/home/hero-bg.png — 200 — 167.9 KiB — 24 ms — http/1.1https://www.outbrain.com/images/pages/home/hero-main-image.pngwww.outbrain.com/images/pages/home/... https://www.outbrain.com/images/pages/home/hero-main-image.png — 200 — 250.1 KiB — 32 ms — http/1.1https://www.outbrain.com/images/pages/home/partner-icon1.svgwww.outbrain.com/images/pages/home/... https://www.outbrain.com/images/pages/home/partner-icon1.svg — 200 — 22.9 KiB — 13 ms — http/1.1https://www.outbrain.com/images/pages/home/partner-icon2.svgwww.outbrain.com/images/pages/home/... https://www.outbrain.com/images/pages/home/partner-icon2.svg — 200 — 40.8 KiB — 13 ms — http/1.1https://www.outbrain.com/images/pages/home/partner-icon3.svgwww.outbrain.com/images/pages/home/... https://www.outbrain.com/images/pages/home/partner-icon3.svg — 200 — 16.4 KiB — 14 ms — http/1.1https://www.outbrain.com/images/pages/home/innovation_main_desktop.pngwww.outbrain.com/images/pages/home/... https://www.outbrain.com/images/pages/home/innovation_main_desktop.png — 200 — 734.2 KiB — 44 ms — http/1.1data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A//www.w3.org/2000/svg%22%20width%3D%224%22%20height%3…data:image/svg+xml,%3Csvg%20xmlns%3... data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A//www.w3.org/2000/svg%22%20width%3D%224%22%20height%3… — 200 — 0 B — 0 ms — datahttps://www.outbrain.com/images/pages/home/performance-icon1.svgwww.outbrain.com/images/pages/home/... https://www.outbrain.com/images/pages/home/performance-icon1.svg — 200 — 1.1 KiB — 8 ms — http/1.1
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 927 ms LCP 2.1 shttps://outbrain.com// https://outbrain.com/ — 301 — 182 B — 11 ms — h2https://www.outbrain.com/www.outbrain.com/ https://www.outbrain.com/ — 200 — 7.4 KiB — 217 ms — http/1.1https://www.outbrain.com/style.csswww.outbrain.com/style.css https://www.outbrain.com/style.css — 200 — 18.2 KiB — 26 ms — http/1.1https://www.outbrain.com/script.jswww.outbrain.com/script.js https://www.outbrain.com/script.js — 200 — 104.6 KiB — 39 ms — http/1.1https://www.outbrain.com/fonts/icomoon/icomoon.woff2www.outbrain.com/fonts/icomoon/icom... https://www.outbrain.com/fonts/icomoon/icomoon.woff2 — 200 — 5.7 KiB — 28 ms — http/1.1https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:ital,wght@0,200..800;1,200..800&display=swapfonts.googleapis.com/css2?family=Pl... https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:ital,wght@0,200..800;1,200..800&display=swap — 200 — 1.1 KiB — 142 ms — h2https://www.outbrain.com/style.css?version=4d2133b27bf2www.outbrain.com/style.css?version=... https://www.outbrain.com/style.css?version=4d2133b27bf2 — 200 — 18.2 KiB — 24 ms — http/1.1https://www.outbrain.com/images/logo-ob-direct.pngwww.outbrain.com/images/logo-ob-dir... https://www.outbrain.com/images/logo-ob-direct.png — 200 — 31.7 KiB — 27 ms — http/1.1https://www.outbrain.com/images/pages/home/performance__1.pngwww.outbrain.com/images/pages/home/... https://www.outbrain.com/images/pages/home/performance__1.png — 200 — 58.6 KiB — 27 ms — http/1.1https://fast.wistia.com/assets/external/E-v1.jsfast.wistia.com/assets/external/E-v... https://fast.wistia.com/assets/external/E-v1.js — 200 — 162.1 KiB — 55 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-MNMBTCwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-MNMBTC — 200 — 182.2 KiB — 309 ms — h2https://www.outbrain.com/images/pages/home/performance__2.pngwww.outbrain.com/images/pages/home/... https://www.outbrain.com/images/pages/home/performance__2.png — 200 — 409.2 KiB — 32 ms — http/1.1https://www.outbrain.com/images/pages/home/performance__3.pngwww.outbrain.com/images/pages/home/... https://www.outbrain.com/images/pages/home/performance__3.png — 200 — 53.7 KiB — 14 ms — http/1.1https://www.outbrain.com/images/pages/home/performance__4.pngwww.outbrain.com/images/pages/home/... https://www.outbrain.com/images/pages/home/performance__4.png — 200 — 36.7 KiB — 26 ms — http/1.1https://www.outbrain.com/assets/new-banner-close.pngwww.outbrain.com/assets/new-banner-... https://www.outbrain.com/assets/new-banner-close.png — 200 — 1.1 KiB — 7 ms — http/1.1https://www.outbrain.com/images/pages/home/ecoflow-circle.pngwww.outbrain.com/images/pages/home/... https://www.outbrain.com/images/pages/home/ecoflow-circle.png — 200 — 4.0 KiB — 20 ms — http/1.1https://www.outbrain.com/images/pages/home/torras-circle.pngwww.outbrain.com/images/pages/home/... https://www.outbrain.com/images/pages/home/torras-circle.png — 200 — 6.5 KiB — 6 ms — http/1.1https://www.outbrain.com/images/pages/home/hipto-circle.pngwww.outbrain.com/images/pages/home/... https://www.outbrain.com/images/pages/home/hipto-circle.png — 200 — 6.3 KiB — 14 ms — http/1.1https://www.outbrain.com/images/pages/home/bottom-cta-image.webpwww.outbrain.com/images/pages/home/... https://www.outbrain.com/images/pages/home/bottom-cta-image.webp — 200 — 162.8 KiB — 23 ms — http/1.1https://www.outbrain.com/script.js?version=4d2133b27bf2www.outbrain.com/script.js?version=... https://www.outbrain.com/script.js?version=4d2133b27bf2 — 200 — 104.6 KiB — 23 ms — http/1.1https://browser.sentry-cdn.com/9.6.1/bundle.min.jsbrowser.sentry-cdn.com/9.6.1/bundle... https://browser.sentry-cdn.com/9.6.1/bundle.min.js — 200 — 24.8 KiB — 18 ms — h2https://www.outbrain.com/assets/top-logo.pngwww.outbrain.com/assets/top-logo.pn... https://www.outbrain.com/assets/top-logo.png — 200 — 3.0 KiB — 4 ms — http/1.1https://www.outbrain.com/images/pages/home/hero-bg.pngwww.outbrain.com/images/pages/home/... https://www.outbrain.com/images/pages/home/hero-bg.png — 200 — 167.9 KiB — 24 ms — http/1.1https://www.outbrain.com/images/pages/home/hero-main-image.pngwww.outbrain.com/images/pages/home/... https://www.outbrain.com/images/pages/home/hero-main-image.png — 200 — 250.1 KiB — 32 ms — http/1.1https://www.outbrain.com/images/pages/home/partner-icon1.svgwww.outbrain.com/images/pages/home/... https://www.outbrain.com/images/pages/home/partner-icon1.svg — 200 — 22.9 KiB — 13 ms — http/1.1https://www.outbrain.com/images/pages/home/partner-icon2.svgwww.outbrain.com/images/pages/home/... https://www.outbrain.com/images/pages/home/partner-icon2.svg — 200 — 40.8 KiB — 13 ms — http/1.1https://www.outbrain.com/images/pages/home/partner-icon3.svgwww.outbrain.com/images/pages/home/... https://www.outbrain.com/images/pages/home/partner-icon3.svg — 200 — 16.4 KiB — 14 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 1078ms · 735KB · €12/mo
fast.wistia.com
Other
Costly
Execution 373ms
Transfer 162 KB
Unused 49%
Monthly Cost €4/mo
fast.wistia.com
Other
Optional
Execution 181ms
Transfer 159 KB
Unused 55%
Monthly Cost €2/mo
Unattributable
Other
Optional
Execution 158ms
Transfer 0 KB
Monthly Cost €2/mo
www.outbrain.com
Other
Optional
Execution 119ms
Transfer 7 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 104ms
Transfer 182 KB
Unused 41%
Monthly Cost €1/mo
www.outbrain.com
Other
Optional
Execution 90ms
Transfer 105 KB
Unused 71%
Monthly Cost €1/mo
OneTrust
Consent
Essential
Execution 53ms
Transfer 120 KB
Unused 62%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • fast.wistia.com adds 373ms 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

fast.wistia.com takes 373ms 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

55% of fast.wistia.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

71% of www.outbrain.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 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

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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