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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
79
GRADE
C
FIX
4
REVIEW
2
PASS
9
INFO
2

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

Mobile Desktop
60
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.

2.67 s

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

14.18 s

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

434 ms

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

0.000

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

2.67 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.

17.34 s

Page Load Progression

480 ms
960 ms
1.4 s
1.9 s
2.4 s
2.9 s
3.4 s
3.8 s
Checks
17
9 PASS 2 REVIEW 4 FIX
D
Page Weight Budget
Action
2.5 MB transferred, 91 requests
FIX
2.5 MB transferred, 91 requests
Warning::
Page weighs 5.0 MB (2.5 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 972 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 972 KB
Info::
91 HTTP requests
Info::
Estimated 0.51 g CO2 per page load
2.5 MB / 2.4 MB budget
2.5 MB transferred
91 requests
0.51 g CO2 per page load
Fonts 1007.9 KiB 40%
JavaScript 972.0 KiB 39%
Images 285.5 KiB 11%
CSS 172.5 KiB 7%
HTML 53.3 KiB 2%
Other 12.8 KiB 1%
Other 3.7 KiB 0%
Other 2.5 KiB 0%
Other 260 B 0%
0 2.4 MB 4.9 MB
Over budget

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

D
JS Execution Cost
Action
2778ms total JS execution
FIX
2778ms total JS execution
Warning::
https://taxfoundation.org/: 1113ms CPU time
Warning::
Unattributable: 385ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-NLR...: 231ms CPU time
Info::
https://cdn-cookieyes.com/client_data/a18d248b6cd8...: 182ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-FP7K...: 172ms CPU time
Warning::
Third-party scripts: 1533ms (55% of total)

Main Thread Breakdown

Script Evaluation 43% Other 25% Style & Layout 17% Script Parsing & Compilation 8% Rendering 3% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://taxfoundation.org/1113ms129ms21ms1st
Unattributable385ms22ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NLRXG9V231ms195ms33ms3rd
https://cdn-cookieyes.com/client_data/a18d248b6cd83900b33df1ef/banner.js182ms147ms2ms3rd
https://www.googletagmanager.com/gtag/js?id=G-FP7KWDV08V&cx=c&gtm=4e64k0h2172ms132ms39ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-1014533101&cx=c&gtm=4e64k0h2158ms131ms26ms3rd
https://js-agent.newrelic.com/nr-spa-1.313.0.min.js132ms105ms9ms3rd
https://taxfoundation.org/wp-includes/js/jquery/jquery.min.js?ver=3.7.1132ms89ms7ms1st
https://www.googletagmanager.com/gtag/js?id=AW-987461063&cx=c&gtm=4e64k0h2111ms81ms29ms3rd
https://cdn-cookieyes.com/client_data/a18d248b6cd83900b33df1ef/script.js84ms77ms3ms3rd

Showing top 10 of 11 scripts

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 (39%)
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 (41%)
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-1014533101137 KB103 KB (75%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-FP7KWDV08V&cx=c&gtm=4e64k0h2174 KB67 KB (39%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-1014533101&cx=c&gtm=4e64k0h2137 KB64 KB (47%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-987461063&cx=c&gtm=4e64k0h2137 KB64 KB (47%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NLRXG9V150 KB61 KB (41%)✓3rd
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/themes/taxfoundation/assets/build/global.min.js?ver=c7bd2a653 KB—✓1st
https://taxfoundation.org/wp-content/plugins/cookie-law-info/lite/frontend/js/gcm.min.js1 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
91 resources · 2.5 MB · 359 KB savings available
FIX
91 resources · 2.5 MB · 359 KB savings available
Warning::
Page weight 1.5 MB over 1MB target
Got: 2.5 MB Expected: ≤ 1 MB
Info::
~359 KB of savings available
Info::
36 third-party resources (36% of weight)
Info::
1 resources over 200KB
91 resources · 2.5 MiB · 36 third-party 1.5 MiB over 1MB target
Font 40% · 1007.9 KiB
JavaScript 39% · 972.0 KiB
Image 12% · 289.4 KiB
CSS 7% · 172.5 KiB
Document 2% · 53.3 KiB
Other 1% · 15.3 KiB

~359.2 KiB of savings available

Remove unused JavaScript: 359.2 KiB
B
Image Optimization
12 images, 0 KB saveable
REVIEW
12 images, 0 KB saveable
Info::
All images are well-optimized
12 images 285 KB
0 oversized -0 KB
9 legacy format
0 missing dimensions CLS risk
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 (891.3 KiB of 2.5 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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s FCP 2.7 s LCP 14.2 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 — 79 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 — 730.6 KiB — 31 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 — 110.9 KiB — 15 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 — 23.7 KiB — 13 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 — 13 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 — 99.1 KiB — 16 ms — font-display: swap
x-font-woff;charset=utf... woff swap
Size 31 KB
Load time 79 ms
Start 209 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 31 ms
Start 267 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 15 ms
Start 267 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 13 ms
Start 268 ms
Risk FOUT — text flashes from fallback to web font
roboto-mono-v31-latin-r... woff2 swap
Size 13 KB
Load time 13 ms
Start 268 ms
Risk FOUT — text flashes from fallback to web font
fa-brands-400.woff2 woff2 swap
Size 99 KB
Load time 16 ms
Start 268 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
3 hints, 0 missing preconnects
PASS
3 hints, 0 missing preconnects
Info::
Page uses 3 resource hint(s)

Current Resource Hints

preconnect
2
preload
—
dns-prefetch
1
prefetch
—

3 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
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
91 requests over 1536ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s FCP 2.7 s LCP 14.2 shttps://taxfoundation.org// https://taxfoundation.org/ — 200 — 53.3 KiB — 15 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 — 33 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 — 109 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 — 14 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 — 27 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 — 16.8 KiB — 33 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 — 882 B — 40 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 — 18.1 KiB — 15 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 — 36.2 KiB — 33 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 — 8.2 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 — 26 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 — 53.6 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 — 2.1 KiB — 18 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 — 2.5 KiB — 35 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 — 540 B — 16 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 — 446 B — 19 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 — 662 B — 28 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 — 538 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 — 668 B — 14 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 — 39 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 — 3.9 KiB — 17 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 — 28 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 — 19 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 — 40 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 — 5.5 KiB — 32 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 — 555 B — 37 ms — h2https://taxfoundation.org/wp-content/uploads/2026/04/AdobeStock_72027150-768x512.jpeg/wp-content/uploads/2026/04/AdobeSt... https://taxfoundation.org/wp-content/uploads/2026/04/AdobeStock_72027150-768x512.jpeg — 200 — 60.6 KiB — 40 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... 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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
55% of JavaScript execution is third-party
First-party Third-party 1533ms · 673KB · €17/mo
Unattributable
Other
Costly
Execution 385ms
Transfer 0 KB
Monthly Cost €4/mo
Google Tag Manager
Tag Manager
Costly
Execution 231ms
Transfer 150 KB
Unused 41%
Monthly Cost €3/mo
cdn-cookieyes.com
Other
Optional
Execution 182ms
Transfer 8 KB
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 172ms
Transfer 174 KB
Unused 39%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 158ms
Transfer 137 KB
Unused 47%
Monthly Cost €2/mo
js-agent.newrelic.com
Other
Optional
Execution 132ms
Transfer 30 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 111ms
Transfer 137 KB
Unused 47%
Monthly Cost €1/mo
cdn-cookieyes.com
Other
Optional
Execution 84ms
Transfer 9 KB
Monthly Cost €1/mo
js.hscollectedforms.net
Other
Optional
Execution 77ms
Transfer 26 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Unattributable adds 385ms and costs ~€4/month
  • Google Tag Manager adds 231ms and costs ~€3/month

55% 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 385ms 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

Google Tag Manager takes 231ms 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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