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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
79
GRADE
C
FIX
3
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
82
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
93
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.

671 ms

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

3.29 s

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

2 ms

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

0.003

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

876 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.

3.30 s

Page Load Progression

476 ms
952 ms
1.4 s
1.9 s
2.4 s
2.9 s
3.3 s
3.8 s
Checks
15
7 PASS 3 REVIEW 3 FIX
D
Page Weight Budget
Action
2.4 MB transferred, 105 requests
FIX
2.4 MB transferred, 105 requests
Info::
Page weighs 5.0 MB (2.4 MB transferred)
Info::
Fonts are 1008 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 1008 KB
Warning::
JavaScript is 973 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 973 KB
Warning::
105 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
105 requests
0.51 g CO2 per page load
Fonts 1007.8 KiB 41%
JavaScript 972.8 KiB 39%
Images 246.3 KiB 10%
CSS 172.2 KiB 7%
HTML 53.3 KiB 2%
Other 12.8 KiB 1%
Other 3.9 KiB 0%
Other 2.4 KiB 0%
Other 260 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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

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
JS Bundles
Action
30 scripts, 359 KB unused
FIX
30 scripts, 359 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-101...: 103 KB unused (75%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-FP7K...: 67 KB unused (38%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-101...: 64 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-987...: 64 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-NLR...: 61 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 359 KB
359 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=AW-1014533101&cx=c&gtm=4e64h1137 KB103 KB (75%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-FP7KWDV08V&cx=c&gtm=4e64h1174 KB67 KB (38%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-1014533101137 KB64 KB (47%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-987461063&cx=c&gtm=4e64h1138 KB64 KB (47%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NLRXG9V150 KB61 KB (40%)✓3rd
https://taxfoundation.org/wp-includes/js/hoverIntent.min.js?ver=1.10.21 KB—✓1st
https://taxfoundation.org/wp-content/themes/taxfoundation/assets/build/global.min.js?ver=c7bd2a653 KB—✓1st
https://taxfoundation.org/wp-content/plugins/wp-job-openings/assets/js/script.min.js?ver=3.5.418 KB—✓1st
https://taxfoundation.org/wp-content/plugins/fionta-toc/dist/scripts.js?ver=6.9.41 KB—✓1st
https://js.hs-scripts.com/20785128.js?integration=WordPress&ver=11.3.331 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

D
Page Weight Inventory
Action
105 resources · 2.4 MB · 359 KB savings available
FIX
105 resources · 2.4 MB · 359 KB savings available
Warning::
Page weight 1.4 MB over 1MB target
Got: 2.4 MB Expected: ≤ 1 MB
Info::
~359 KB of savings available
Info::
36 third-party resources (36% of weight)
Info::
1 resources over 200KB
105 resources · 2.4 MiB · 36 third-party 1.4 MiB over 1MB target
Font 41% · 1007.8 KiB
JavaScript 39% · 972.8 KiB
Image 10% · 250.3 KiB
CSS 7% · 172.2 KiB
Document 2% · 53.3 KiB
Other 1% · 15.4 KiB

~358.8 KiB of savings available

Remove unused JavaScript: 358.8 KiB
B
Image Optimization
26 images, 0 KB saveable
REVIEW
26 images, 0 KB saveable
Info::
All images are well-optimized
26 images 246 KB
0 oversized -0 KB
9 legacy format
0 missing dimensions CLS risk
B
JS Execution Cost
630ms total JS execution
REVIEW
630ms total JS execution
Warning::
https://taxfoundation.org/: 364ms CPU time
Info::
Unattributable: 142ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-NLR...: 71ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-FP7K...: 54ms CPU time
Info::
Third-party scripts: 266ms (42% of total)

Main Thread Breakdown

Script Evaluation 39% Other 26% Style & Layout 19% Script Parsing & Compilation 8% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://taxfoundation.org/364ms41ms6ms1st
Unattributable142ms6ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NLRXG9V71ms58ms11ms3rd
https://www.googletagmanager.com/gtag/js?id=G-FP7KWDV08V&cx=c&gtm=4e64h154ms43ms11ms3rd
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A
Third-Party Impact
36% third-party, 0 ms blocking
PASS
36% third-party, 0 ms blocking
Info::
Third-party code accounts for 36% of page weight (892.3 KiB of 2.4 MiB)
Info::
Third-party blocking time is low (0 ms)
64%
36%
First-party Third-party
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 (1008 KB)
PASS
6 fonts (1008 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

1008 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 1.0 s 2.0 s 3.0 s FCP 671 ms LCP 3.3 sdata:application/x-font-woff;charset=utf-8;base64,d09GRgABAAAAAHvwAAsAAAAA3EgAAQAAAAAAAAAAAAAAAAAAA…x-font-woff;charset=utf... data:application/x-font-woff;charset=utf-8;base64,d09GRgABAAAAAHvwAAsAAAAA3EgAAQAAAAAAAAAAAAAAAAAAA… — 31.0 KiB — 106 ms — font-display: swaphttps://taxfoundation.org/wp-content/themes/taxfoundation/assets/fonts/google-fonts/roboto-flex/roboto-flex-variable.woff2roboto-flex-variable.woff2 https://taxfoundation.org/wp-content/themes/taxfoundation/assets/fonts/google-fonts/roboto-flex/roboto-flex-variable.woff2 — 730.5 KiB — 51 ms — font-display: swaphttps://taxfoundation.org/wp-content/themes/taxfoundation/assets/fonts/fontawesome/webfonts//fa-solid-900.woff2fa-solid-900.woff2 https://taxfoundation.org/wp-content/themes/taxfoundation/assets/fonts/fontawesome/webfonts//fa-solid-900.woff2 — 110.8 KiB — 41 ms — font-display: swaphttps://taxfoundation.org/wp-content/themes/taxfoundation/assets/fonts/google-fonts/newsreader/newsreader-v26-latin-600.woff2newsreader-v26-latin-60... https://taxfoundation.org/wp-content/themes/taxfoundation/assets/fonts/google-fonts/newsreader/newsreader-v26-latin-600.woff2 — 23.6 KiB — 33 ms — font-display: swaphttps://taxfoundation.org/wp-content/themes/taxfoundation/assets/fonts/google-fonts/roboto-mono/roboto-mono-v31-latin-regular.woff2roboto-mono-v31-latin-r... https://taxfoundation.org/wp-content/themes/taxfoundation/assets/fonts/google-fonts/roboto-mono/roboto-mono-v31-latin-regular.woff2 — 12.7 KiB — 22 ms — font-display: swaphttps://taxfoundation.org/wp-content/themes/taxfoundation/assets/fonts/fontawesome/webfonts//fa-brands-400.woff2fa-brands-400.woff2 https://taxfoundation.org/wp-content/themes/taxfoundation/assets/fonts/fontawesome/webfonts//fa-brands-400.woff2 — 99.2 KiB — 28 ms — font-display: swap
x-font-woff;charset=utf... woff swap
Size 31 KB
Load time 106 ms
Start 170 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
roboto-flex-variable.woff2 woff2 swap
Size 731 KB
Load time 51 ms
Start 251 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-solid-900.woff2 woff2 swap
Size 111 KB
Load time 41 ms
Start 251 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
newsreader-v26-latin-60... woff2 swap
Size 24 KB
Load time 33 ms
Start 251 ms
Risk FOUT — text flashes from fallback to web font
roboto-mono-v31-latin-r... woff2 swap
Size 13 KB
Load time 22 ms
Start 261 ms
Risk FOUT — text flashes from fallback to web font
fa-brands-400.woff2 woff2 swap
Size 99 KB
Load time 28 ms
Start 262 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)

Fixing the unchecked items could save ~430 KB and ~860 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=604800 (1 week)
PASS
max-age=604800 (1 week)
Info::
Cache-Control header is set
Got: public, max-age=604800
Info::
Effective TTL: 1 week (max-age=604800)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

public, max-age=604800

DirectiveValueMeaning
public—Any cache may store this response
max-age604800Cache for 1 week
Effective TTL: 604800 seconds
Network Waterfall
105 requests over 1505ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 671 ms LCP 3.3 shttps://taxfoundation.org// https://taxfoundation.org/ — 200 — 53.3 KiB — 8 ms — h2https://taxfoundation.org/wp-content/plugins/cookie-law-info/lite/frontend/js/gcm.min.js/wp-content/plugins/cookie-law-info... https://taxfoundation.org/wp-content/plugins/cookie-law-info/lite/frontend/js/gcm.min.js — 200 — 1.4 KiB — 6 ms — h2https://cdn-cookieyes.com/client_data/a18d248b6cd83900b33df1ef/script.jscdn-cookieyes.com/client_data/a18d2... https://cdn-cookieyes.com/client_data/a18d248b6cd83900b33df1ef/script.js — 200 — 9.4 KiB — 74 ms — h2https://taxfoundation.org/wp-content/plugins/wp-job-openings/assets/css/general.min.css?ver=3.5.4/wp-content/plugins/wp-job-openings... https://taxfoundation.org/wp-content/plugins/wp-job-openings/assets/css/general.min.css?ver=3.5.4 — 200 — 7.2 KiB — 19 ms — h2https://taxfoundation.org/wp-content/plugins/wp-job-openings/assets/css/style.min.css?ver=3.5.4/wp-content/plugins/wp-job-openings... https://taxfoundation.org/wp-content/plugins/wp-job-openings/assets/css/style.min.css?ver=3.5.4 — 200 — 5.2 KiB — 17 ms — h2https://taxfoundation.org/wp-content/plugins/simple-social-buttons/assets/css/front.css?ver=6.2.0/wp-content/plugins/simple-social-b... https://taxfoundation.org/wp-content/plugins/simple-social-buttons/assets/css/front.css?ver=6.2.0 — 200 — 16.7 KiB — 23 ms — h2https://taxfoundation.org/wp-content/plugins/sitepress-multilingual-cms/templates/language-switchers/legacy-dropdown/style.min.css?ver=1/wp-content/plugins/sitepress-multi... https://taxfoundation.org/wp-content/plugins/sitepress-multilingual-cms/templates/language-switchers/legacy-dropdown/style.min.css?ver=1 — 200 — 800 B — 44 ms — h2https://taxfoundation.org/wp-content/uploads/maxmegamenu/style_en.css?ver=0f2055/wp-content/uploads/maxmegamenu/sty... https://taxfoundation.org/wp-content/uploads/maxmegamenu/style_en.css?ver=0f2055 — 200 — 18.2 KiB — 43 ms — h2https://taxfoundation.org/wp-includes/css/dashicons.min.css?ver=6.9.4/wp-includes/css/dashicons.min.css?... https://taxfoundation.org/wp-includes/css/dashicons.min.css?ver=6.9.4 — 200 — 36.3 KiB — 30 ms — h2https://taxfoundation.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://taxfoundation.org/wp-content/plugins/search-filter-pro/public/assets/css/search-filter.min.css?ver=2.5.21 — 200 — 8.1 KiB — 26 ms — h2https://taxfoundation.org/wp-content/themes/taxfoundation/assets/libraries/aos/aos.css?ver=2.3.4/wp-content/themes/taxfoundation/as... https://taxfoundation.org/wp-content/themes/taxfoundation/assets/libraries/aos/aos.css?ver=2.3.4 — 200 — 3.3 KiB — 32 ms — h2https://taxfoundation.org/wp-content/themes/taxfoundation/assets/build/global.min.css?ver=7d14726e/wp-content/themes/taxfoundation/as... https://taxfoundation.org/wp-content/themes/taxfoundation/assets/build/global.min.css?ver=7d14726e — 200 — 53.5 KiB — 43 ms — h2https://taxfoundation.org/wp-content/plugins/tablepress-premium/css/build/default.css?ver=3.2.3/wp-content/plugins/tablepress-prem... https://taxfoundation.org/wp-content/plugins/tablepress-premium/css/build/default.css?ver=3.2.3 — 200 — 2.2 KiB — 16 ms — h2https://taxfoundation.org/wp-content/plugins/tablepress-premium/modules/css/build/datatables.buttons.css?ver=3.2.3/wp-content/plugins/tablepress-prem... https://taxfoundation.org/wp-content/plugins/tablepress-premium/modules/css/build/datatables.buttons.css?ver=3.2.3 — 200 — 2.4 KiB — 17 ms — h2https://taxfoundation.org/wp-content/plugins/tablepress-premium/modules/css/build/datatables.columnfilterwidgets.css?ver=3.2.3/wp-content/plugins/tablepress-prem... https://taxfoundation.org/wp-content/plugins/tablepress-premium/modules/css/build/datatables.columnfilterwidgets.css?ver=3.2.3 — 200 — 469 B — 19 ms — h2https://taxfoundation.org/wp-content/plugins/tablepress-premium/modules/css/build/datatables.fixedheader.css?ver=3.2.3/wp-content/plugins/tablepress-prem... https://taxfoundation.org/wp-content/plugins/tablepress-premium/modules/css/build/datatables.fixedheader.css?ver=3.2.3 — 200 — 434 B — 40 ms — h2https://taxfoundation.org/wp-content/plugins/tablepress-premium/modules/css/build/datatables.fixedcolumns.css?ver=3.2.3/wp-content/plugins/tablepress-prem... https://taxfoundation.org/wp-content/plugins/tablepress-premium/modules/css/build/datatables.fixedcolumns.css?ver=3.2.3 — 200 — 753 B — 36 ms — h2https://taxfoundation.org/wp-content/plugins/tablepress-premium/modules/css/build/datatables.scroll-buttons.css?ver=3.2.3/wp-content/plugins/tablepress-prem... https://taxfoundation.org/wp-content/plugins/tablepress-premium/modules/css/build/datatables.scroll-buttons.css?ver=3.2.3 — 200 — 640 B — 40 ms — h2https://taxfoundation.org/wp-content/plugins/tablepress-premium/modules/css/build/datatables.serverside-processing.css?ver=3.2.3/wp-content/plugins/tablepress-prem... https://taxfoundation.org/wp-content/plugins/tablepress-premium/modules/css/build/datatables.serverside-processing.css?ver=3.2.3 — 200 — 648 B — 35 ms — h2https://taxfoundation.org/wp-content/plugins/tablepress-premium/modules/css/build/responsive-tables.css?ver=3.2.3/wp-content/plugins/tablepress-prem... https://taxfoundation.org/wp-content/plugins/tablepress-premium/modules/css/build/responsive-tables.css?ver=3.2.3 — 200 — 3.0 KiB — 30 ms — h2https://taxfoundation.org/wp-content/plugins/pro-pack-for-wp-job-openings/assets/css/flatpickr.min.css?ver=4.6.9/wp-content/plugins/pro-pack-for-wp... https://taxfoundation.org/wp-content/plugins/pro-pack-for-wp-job-openings/assets/css/flatpickr.min.css?ver=4.6.9 — 200 — 3.8 KiB — 26 ms — h2https://taxfoundation.org/wp-content/plugins/pro-pack-for-wp-job-openings/assets/css/intlTelInput.min.css?ver=17.0.16/wp-content/plugins/pro-pack-for-wp... https://taxfoundation.org/wp-content/plugins/pro-pack-for-wp-job-openings/assets/css/intlTelInput.min.css?ver=17.0.16 — 200 — 3.5 KiB — 37 ms — h2https://taxfoundation.org/wp-content/plugins/pro-pack-for-wp-job-openings/assets/css/style.min.css?ver=3.4.2/wp-content/plugins/pro-pack-for-wp... https://taxfoundation.org/wp-content/plugins/pro-pack-for-wp-job-openings/assets/css/style.min.css?ver=3.4.2 — 200 — 4.0 KiB — 17 ms — h2https://taxfoundation.org/wp-includes/js/jquery/jquery.min.js?ver=3.7.1/wp-includes/js/jquery/jquery.min.j... https://taxfoundation.org/wp-includes/js/jquery/jquery.min.js?ver=3.7.1 — 200 — 34.9 KiB — 23 ms — h2https://taxfoundation.org/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.4.1/wp-includes/js/jquery/jquery-migra... https://taxfoundation.org/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.4.1 — 200 — 5.6 KiB — 23 ms — h2https://taxfoundation.org/wp-content/plugins/sitepress-multilingual-cms/templates/language-switchers/legacy-dropdown/script.min.js?ver=1/wp-content/plugins/sitepress-multi... https://taxfoundation.org/wp-content/plugins/sitepress-multilingual-cms/templates/language-switchers/legacy-dropdown/script.min.js?ver=1 — 200 — 558 B — 32 ms — h2https://taxfoundation.org/wp-content/uploads/2026/04/AdobeStock_72027150-300x200.jpeg/wp-content/uploads/2026/04/AdobeSt... https://taxfoundation.org/wp-content/uploads/2026/04/AdobeStock_72027150-300x200.jpeg — 200 — 12.5 KiB — 23 ms — h2https://taxfoundation.org/wp-content/plugins/pro-pack-for-wp-job-openings/assets/js/public/job-block.js?ver=3.4.2/wp-content/plugins/pro-pack-for-wp... https://taxfoundation.org/wp-content/plugins/pro-pack-for-wp-job-openings/assets/js/public/job-block.js?ver=3.4.2 — 200 — 600 B — 32 ms — h2https://taxfoundation.org/wp-content/plugins/simple-social-buttons/assets/js/frontend-blocks.js?ver=6.2.0/wp-content/plugins/simple-social-b... https://taxfoundation.org/wp-content/plugins/simple-social-buttons/assets/js/frontend-blocks.js?ver=6.2.0 — 200 — 368 B — 25 ms — h2https://taxfoundation.org/wp-content/plugins/wp-job-openings/assets/js/script.min.js?ver=3.5.4/wp-content/plugins/wp-job-openings... https://taxfoundation.org/wp-content/plugins/wp-job-openings/assets/js/script.min.js?ver=3.5.4 — 200 — 17.9 KiB — 8 ms — h2
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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
42% of JavaScript execution is third-party
First-party Third-party 266ms · 324KB · €3/mo
Unattributable
Other
Optional
Execution 142ms
Transfer 0 KB
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 71ms
Transfer 150 KB
Unused 40%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 54ms
Transfer 174 KB
Unused 38%
Monthly Cost €1/mo

42% 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

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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