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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
4
REVIEW
3
PASS
6
INFO
2

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

Mobile Desktop
73
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
84
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
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.

1.01 s

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.

302 ms

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

0.004

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

1.60 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.

4.50 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
6 PASS 3 REVIEW 4 FIX
D
Page Weight Budget
Action
2.6 MB transferred, 128 requests
FIX
2.6 MB transferred, 128 requests
Warning::
Page weighs 6.8 MB (2.6 MB transferred)
Warning::
JavaScript is 1.5 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.5 MB
Info::
Fonts are 331 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 331 KB
Info::
CSS is 209 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 209 KB
Warning::
128 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.54 g CO2 per page load
2.6 MB / 2.4 MB budget
2.6 MB transferred
128 requests
0.54 g CO2 per page load
JavaScript 1.5 MiB 59%
Images 449.3 KiB 17%
Fonts 331.1 KiB 13%
CSS 208.6 KiB 8%
HTML 55.1 KiB 2%
Other 10.4 KiB 0%
Other 6.1 KiB 0%
Other 1.7 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

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

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

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
JS Execution Cost
Action
2502ms total JS execution
FIX
2502ms total JS execution
Warning::
https://pytorch.org/: 637ms CPU time
Warning::
Unattributable: 404ms CPU time
Warning::
https://cmp.osano.com/16A0DbT9yDNIaQkvZ/31b1b91a-e...: 340ms CPU time
Info::
https://js.hs-analytics.net/analytics/177689040000...: 222ms CPU time
Info::
https://js.hsforms.net/forms/embed/v2.js: 164ms CPU time
Warning::
Third-party scripts: 1716ms (69% of total)

Main Thread Breakdown

Script Evaluation 59% Other 15% Style & Layout 12% Script Parsing & Compilation 8% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://pytorch.org/637ms248ms12ms1st
Unattributable404ms96ms0ms3rd
https://cmp.osano.com/16A0DbT9yDNIaQkvZ/31b1b91a-e0b6-47ea-bde2-7f2bd13dbe5c/osano.js340ms267ms19ms3rd
https://js.hs-analytics.net/analytics/1776890400000/8112310.js222ms146ms7ms3rd
https://js.hsforms.net/forms/embed/v2.js164ms99ms27ms3rd
https://pytorch.org/wp-includes/js/jquery/jquery.min.js?ver=3.7.1150ms118ms3ms1st
https://www.googletagmanager.com/gtag/js?id=AW-1032976986117ms82ms21ms3rd
https://www.googletagmanager.com/gtag/js?id=G-469Y0W5V62&cx=c&gtm=4e64k0114ms93ms20ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-T8XT4PS100ms81ms16ms3rd
https://js-agent.newrelic.com/nr-spa-1.313.1.min.js68ms56ms4ms3rd

Showing top 10 of 13 scripts

F
JS Bundles
Action
53 scripts, 557 KB unused
FIX
53 scripts, 557 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-103...: 106 KB unused (72%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://pytorch.org/wp-content/themes/salient/js/b...: 85 KB unused (80%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://js.hsforms.net/forms/embed/v2.js: 73 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-103...: 65 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-469Y...: 65 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 557 KB
557 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=AW-1032976986&cx=c&gtm=4e64k0148 KB106 KB (72%)✓3rd
https://pytorch.org/wp-content/themes/salient/js/build/init.js?ver=18.1.1107 KB85 KB (80%)✓1st
https://js.hsforms.net/forms/embed/v2.js193 KB73 KB (39%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-1032976986148 KB65 KB (44%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-469Y0W5V62&cx=c&gtm=4e64k0160 KB65 KB (41%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-T8XT4PS132 KB62 KB (47%)✓3rd
https://connect.facebook.net/en_US/fbevents.js97 KB32 KB (34%)✓3rd
https://lfx-segment.platform.linuxfoundation.org/latest/lfx-segment-analytics.min.js83 KB27 KB (33%)✓3rd
https://pytorch.org/wp-content/plugins/search-filter-pro/public/assets/js/search-filter-build.min.js?ver=2.5.2122 KB20 KB (94%)✓1st
https://pytorch.org/wp-content/themes/salient/js/build/third-party/jquery.fancybox.js?ver=18.1.126 KB20 KB (79%)✓1st

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
128 resources · 2.6 MB · 557 KB savings available
FIX
128 resources · 2.6 MB · 557 KB savings available
Warning::
Page weight 1.6 MB over 1MB target
Got: 2.6 MB Expected: ≤ 1 MB
Info::
~557 KB of savings available
Warning::
63 third-party resources (54% of weight)
Info::
1 resources over 200KB
128 resources · 2.6 MiB · 63 third-party 1.6 MiB over 1MB target
JavaScript 60% · 1.5 MiB
Image 17% · 451.3 KiB
Font 13% · 331.1 KiB
CSS 8% · 208.6 KiB
Document 2% · 55.1 KiB
Other 1% · 14.3 KiB

~556.9 KiB of savings available

Remove unused JavaScript: 556.9 KiB
B
Third-Party Impact
54% third-party, 0 ms blocking
REVIEW
54% third-party, 0 ms blocking
Warning::
Third-party code accounts for 54% of page weight (1.4 MiB of 2.6 MiB)
Info::
Third-party blocking time is low (0 ms)
46%
54%
First-party Third-party
B
Image Optimization
12 images, 0 KB saveable
REVIEW
12 images, 0 KB saveable
Warning::
https://pytorch.org/wp-content/uploads/2024/10/log... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
12 images 449 KB
0 oversized -0 KB
11 legacy format
1 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

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
6 fonts (331 KB)
PASS
6 fonts (331 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

331 KB total

Render-blocking

0

of 6

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 1.0 s LCP 2.1 shttps://pytorch.org/wp-content/themes/salient-child/fonts/Montserrat/static/Montserrat-Regular.ttfMontserrat-Regular.ttf https://pytorch.org/wp-content/themes/salient-child/fonts/Montserrat/static/Montserrat-Regular.ttf — 90.3 KiB — 35 ms — font-display: swaphttps://pytorch.org/wp-content/themes/salient/css/fonts/icomoon.woff?v=1.7icomoon.woff https://pytorch.org/wp-content/themes/salient/css/fonts/icomoon.woff?v=1.7 — 21.8 KiB — 14 ms — font-display: swaphttps://pytorch.org/wp-content/themes/salient/css/fonts/OpenSans-Bold.woffOpenSans-Bold.woff https://pytorch.org/wp-content/themes/salient/css/fonts/OpenSans-Bold.woff — 56.8 KiB — 30 ms — font-display: swaphttps://pytorch.org/wp-content/themes/salient/css/fonts/OpenSans-Regular.woffOpenSans-Regular.woff https://pytorch.org/wp-content/themes/salient/css/fonts/OpenSans-Regular.woff — 54.4 KiB — 13 ms — font-display: swaphttps://use.fontawesome.com/releases/v6.0.0/webfonts/fa-brands-400.woff2fa-brands-400.woff2 https://use.fontawesome.com/releases/v6.0.0/webfonts/fa-brands-400.woff2 — 102.7 KiB — 29 ms — font-display: swaphttps://use.fontawesome.com/releases/v6.0.0/webfonts/fa-v4compatibility.woff2fa-v4compatibility.woff2 https://use.fontawesome.com/releases/v6.0.0/webfonts/fa-v4compatibility.woff2 — 5.1 KiB — 14 ms — font-display: swap
Montserrat-Regular.ttf ttf swap
Size 90 KB
Load time 35 ms
Start 715 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
icomoon.woff woff swap
Size 22 KB
Load time 14 ms
Start 716 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
OpenSans-Bold.woff woff swap
Size 57 KB
Load time 30 ms
Start 718 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
OpenSans-Regular.woff woff swap
Size 54 KB
Load time 13 ms
Start 904 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
fa-brands-400.woff2 woff2 swap
Size 103 KB
Load time 29 ms
Start 905 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
fa-v4compatibility.woff2 woff2 swap
Size 5 KB
Load time 14 ms
Start 1.2 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)

Fixing the unchecked items could save ~118 KB and ~236 ms

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
A+
HTTP Caching
max-age=60 (1 minute)
PASS
max-age=60 (1 minute)
Info::
Cache-Control header is set
Got: public, max-age=60, s-maxage=43200, stale-while-revalidate=86400, stale-if-error=604800
Info::
Effective TTL: 1 minute (max-age=60)
Info::
CDN TTL: 12 hours (s-maxage=43200)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

public, max-age=60, s-maxage=43200, stale-while-revalidate=86400, stale-if-error=604800

DirectiveValueMeaning
public—Any cache may store this response
max-age60Cache for 1 minute
s-maxage43200CDN caches for 12 hours
stale-while-revalidate86400Serve stale for 1 day while fetching fresh
stale-if-error604800
Effective TTL: 60 seconds
Network Waterfall
128 requests over 3192ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 1.0 s LCP 2.1 shttps://pytorch.org// https://pytorch.org/ — 200 — 53.8 KiB — 21 ms — h2https://cmp.osano.com/16A0DbT9yDNIaQkvZ/31b1b91a-e0b6-47ea-bde2-7f2bd13dbe5c/osano.jscmp.osano.com/16A0DbT9yDNIaQkvZ/31b... https://cmp.osano.com/16A0DbT9yDNIaQkvZ/31b1b91a-e0b6-47ea-bde2-7f2bd13dbe5c/osano.js — 200 — 62.8 KiB — 208 ms — h3https://lfx-segment.platform.linuxfoundation.org/latest/lfx-segment-analytics.min.jslfx-segment.platform.linuxfoundatio... https://lfx-segment.platform.linuxfoundation.org/latest/lfx-segment-analytics.min.js — 200 — 83.1 KiB — 243 ms — h2https://pytorch.org/wp-content/plugins/events-calendar-pro/build/css/tribe-events-pro-mini-calendar-block.css?ver=7.7.14/wp-content/plugins/events-calendar... https://pytorch.org/wp-content/plugins/events-calendar-pro/build/css/tribe-events-pro-mini-calendar-block.css?ver=7.7.14 — 200 — 728 B — 74 ms — h2https://pytorch.org/wp-includes/css/dist/block-library/style.min.css?ver=6.9.4/wp-includes/css/dist/block-library... https://pytorch.org/wp-includes/css/dist/block-library/style.min.css?ver=6.9.4 — 200 — 20.2 KiB — 89 ms — h2https://pytorch.org/wp-content/plugins/lf-pt-matrix/public/css/matrix.css?ver=1.0.5/wp-content/plugins/lf-pt-matrix/pu... https://pytorch.org/wp-content/plugins/lf-pt-matrix/public/css/matrix.css?ver=1.0.5 — 200 — 4.1 KiB — 68 ms — h2https://pytorch.org/wp-content/themes/salient-child/vc-addons/css/featherlight.css?ver=6.9.4/wp-content/themes/salient-child/vc... https://pytorch.org/wp-content/themes/salient-child/vc-addons/css/featherlight.css?ver=6.9.4 — 200 — 1.7 KiB — 70 ms — h2https://pytorch.org/wp-content/plugins/search-filter-pro/public/assets/css/search-filter.min.css?ver=2.5.21/wp-content/plugins/search-filter-p... https://pytorch.org/wp-content/plugins/search-filter-pro/public/assets/css/search-filter.min.css?ver=2.5.21 — 200 — 8.2 KiB — 63 ms — h2https://pytorch.org/wp-content/themes/salient-child/style.css?ver=18.1.1/wp-content/themes/salient-child/st... https://pytorch.org/wp-content/themes/salient-child/style.css?ver=18.1.1 — 200 — 1.5 KiB — 78 ms — h2https://pytorch.org/wp-content/themes/salient-child/vc-addons/css/vc-addons.css?ver=18.1.1/wp-content/themes/salient-child/vc... https://pytorch.org/wp-content/themes/salient-child/vc-addons/css/vc-addons.css?ver=18.1.1 — 200 — 5.4 KiB — 122 ms — h2https://pytorch.org/wp-content/themes/salient-child/templates/css/templates.css?ver=18.1.1/wp-content/themes/salient-child/te... https://pytorch.org/wp-content/themes/salient-child/templates/css/templates.css?ver=18.1.1 — 200 — 3.5 KiB — 151 ms — h2https://pytorch.org/wp-content/themes/salient-child/widgets/css/widgets.css?ver=18.1.1/wp-content/themes/salient-child/wi... https://pytorch.org/wp-content/themes/salient-child/widgets/css/widgets.css?ver=18.1.1 — 200 — 731 B — 146 ms — h2https://pytorch.org/wp-content/themes/salient-child/search-filter/css/results.css?ver=18.1.1/wp-content/themes/salient-child/se... https://pytorch.org/wp-content/themes/salient-child/search-filter/css/results.css?ver=18.1.1 — 200 — 1.5 KiB — 124 ms — h2https://pytorch.org/wp-content/themes/salient-child/fonts/fonts.css?ver=18.1.1/wp-content/themes/salient-child/fo... https://pytorch.org/wp-content/themes/salient-child/fonts/fonts.css?ver=18.1.1 — 200 — 772 B — 81 ms — h2https://pytorch.org/wp-content/themes/salient-child/css/events-calendar.css?ver=18.1.1/wp-content/themes/salient-child/cs... https://pytorch.org/wp-content/themes/salient-child/css/events-calendar.css?ver=18.1.1 — 200 — 593 B — 161 ms — h2https://pytorch.org/wp-content/themes/salient-child/vc-addons/css/latest-posts-linux.css?ver=18.1.1/wp-content/themes/salient-child/vc... https://pytorch.org/wp-content/themes/salient-child/vc-addons/css/latest-posts-linux.css?ver=18.1.1 — 200 — 1.1 KiB — 171 ms — h2https://use.fontawesome.com/releases/v6.0.0/css/all.css?ver=6.0.0use.fontawesome.com/releases/v6.0.0... https://use.fontawesome.com/releases/v6.0.0/css/all.css?ver=6.0.0 — 200 — 20.0 KiB — 82 ms — h2https://use.fontawesome.com/releases/v6.0.0/css/v4-shims.css?ver=6.0.0use.fontawesome.com/releases/v6.0.0... https://use.fontawesome.com/releases/v6.0.0/css/v4-shims.css?ver=6.0.0 — 200 — 4.8 KiB — 49 ms — h2https://pytorch.org/wp-content/themes/salient/css/build/grid-system.css?ver=18.1.1/wp-content/themes/salient/css/buil... https://pytorch.org/wp-content/themes/salient/css/build/grid-system.css?ver=18.1.1 — 200 — 3.9 KiB — 91 ms — h2https://pytorch.org/wp-content/themes/salient/css/build/style.css?ver=18.1.1/wp-content/themes/salient/css/buil... https://pytorch.org/wp-content/themes/salient/css/build/style.css?ver=18.1.1 — 200 — 38.3 KiB — 148 ms — h2https://pytorch.org/wp-content/themes/salient/css/build/header/header-secondary-nav.css?ver=18.1.1/wp-content/themes/salient/css/buil... https://pytorch.org/wp-content/themes/salient/css/build/header/header-secondary-nav.css?ver=18.1.1 — 200 — 2.5 KiB — 189 ms — h2https://pytorch.org/wp-content/themes/salient/css/build/elements/element-toggles.css?ver=18.1.1/wp-content/themes/salient/css/buil... https://pytorch.org/wp-content/themes/salient/css/build/elements/element-toggles.css?ver=18.1.1 — 200 — 1.1 KiB — 74 ms — h2https://pytorch.org/wp-content/themes/salient/css/build/elements/element-page-submenu.css?ver=18.1.1/wp-content/themes/salient/css/buil... https://pytorch.org/wp-content/themes/salient/css/build/elements/element-page-submenu.css?ver=18.1.1 — 200 — 1.3 KiB — 110 ms — h2https://pytorch.org/wp-content/themes/salient/css/build/elements/element-wpb-column-border.css?ver=18.1.1/wp-content/themes/salient/css/buil... https://pytorch.org/wp-content/themes/salient/css/build/elements/element-wpb-column-border.css?ver=18.1.1 — 200 — 2.0 KiB — 107 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
69% of JavaScript execution is third-party
First-party Third-party 1716ms · 997KB · €30/mo
Unattributable
Other
Costly
Execution 404ms
Transfer 0 KB
Monthly Cost €7/mo
cmp.osano.com
Other
Costly
Execution 340ms
Transfer 63 KB
Monthly Cost €6/mo
HubSpot Analytics
Analytics
Costly
Execution 222ms
Transfer 45 KB
Monthly Cost €4/mo
js.hsforms.net
Other
Optional
Execution 164ms
Transfer 193 KB
Unused 39%
Monthly Cost €3/mo
Google Tag Manager
Tag Manager
Optional
Execution 117ms
Transfer 148 KB
Unused 44%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 114ms
Transfer 160 KB
Unused 41%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 100ms
Transfer 132 KB
Unused 47%
Monthly Cost €2/mo
js-agent.newrelic.com
Other
Optional
Execution 68ms
Transfer 30 KB
Monthly Cost €1/mo
Facebook Pixel
Advertising
Optional
Execution 68ms
Transfer 97 KB
Unused 34%
Monthly Cost €1/mo
Facebook Pixel
Advertising
Optional
Execution 67ms
Transfer 47 KB
Monthly Cost €1/mo
lfx-segment.platform.linuxfoundation.org
Other
Optional
Execution 53ms
Transfer 83 KB
Unused 33%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Unattributable adds 404ms and costs ~€7/month
  • cmp.osano.com adds 340ms and costs ~€6/month
  • HubSpot Analytics adds 222ms and costs ~€4/month

69% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

Unattributable takes 404ms 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

cmp.osano.com takes 340ms 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

HubSpot Analytics takes 222ms 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

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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