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https://fc2.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
91
GRADE
A
FIX
2
REVIEW
3
PASS
8
INFO
2

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

Mobile Desktop
90
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
65
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
92
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
85
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.

1.26 s

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

1.63 s

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

0 ms

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

0.001

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

1.35 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.

1.63 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
8 PASS 3 REVIEW 2 FIX
D
Third-Party Impact
Action
85% third-party, 0 ms blocking
FIX
85% third-party, 0 ms blocking
Warning::
Third-party code accounts for 85% of page weight (580.4 KiB of 679.4 KiB)
Info::
Third-party blocking time is low (0 ms)
85%
First-party Third-party
D
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.
Info::
ETag present — enables conditional (304) responses
Info::
Last-Modified header present

No Cache-Control header

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

B
Image Optimization
18 images, 0 KB saveable
REVIEW
18 images, 0 KB saveable
Warning::
https://static.fc2.com/fc2com/image/twitter.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
18 images 206 KB
0 oversized -0 KB
18 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

B
JS Bundles
23 scripts, 109 KB unused
REVIEW
23 scripts, 109 KB unused
Warning::
https://fc2.com/js/jquery-3.7.1.min.js: 55 KB unused (65%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://connect.facebook.net/en_US/all.js?hash=9c1...: 53 KB unused (64%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 109 KB
109 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://fc2.com/js/jquery-3.7.1.min.js86 KB55 KB (65%)✓1st
https://connect.facebook.net/en_US/all.js?hash=9c14cb89f82536b5d0b8ca26bf5baed983 KB53 KB (64%)✓3rd
https://fc2.com/en/newentry.js3 KB—✓1st
https://static.xx.fbcdn.net/rsrc.php/v4/yP/r/dg24ld0h9iw.js2 KB—✓3rd
https://fc2.com/en/notice.js1 KB—✓1st
https://static.fc2.com/share/fc2parts/js/common_design.js2 KB—✓3rd
https://gdpr.fc2.com/share/js/gdpr/pp_agreement.pc.en.20180518.js2 KB—✓3rd
https://fc2.com/fc2dc/footer.js2 KB—✓1st
https://connect.facebook.net/en_US/all.js2 KB—✓3rd
https://ssl.google-analytics.com/ga.js17 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

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Page Weight Budget
679 KB transferred, 59 requests
PASS
679 KB transferred, 59 requests
Info::
Page weighs 1.6 MB (679 KB transferred)
Info::
59 HTTP requests
Info::
Estimated 0.14 g CO2 per page load
679 KB / 2.4 MB budget
679 KB transferred
59 requests
0.14 g CO2 per page load
JavaScript 428.2 KiB 63%
Images 206.2 KiB 30%
HTML 23.7 KiB 3%
CSS 19.9 KiB 3%
Other 778 B 0%
Other 672 B 0%
0 2.4 MB 4.9 MB
Under budget
A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
JS Execution Cost
166ms total JS execution
PASS
166ms total JS execution
Info::
https://fc2.com/: 85ms CPU time
Info::
Unattributable: 81ms CPU time
Info::
Third-party scripts: 81ms (49% of total)

Main Thread Breakdown

Other 41% Script Evaluation 27% Style & Layout 16% Script Parsing & Compilation 7% Parse HTML & CSS 5% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://fc2.com/85ms2ms1ms1st
Unattributable81ms1ms0ms3rd
A+
Font Loading
No web fonts (system fonts)
PASS
No web fonts (system fonts)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
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
Page Weight Inventory
59 resources · 679 KB · 109 KB savings available
PASS
59 resources · 679 KB · 109 KB savings available
Info::
Within 1MB page-weight target
Got: 679 KB
Info::
~109 KB of savings available
Warning::
53 third-party resources (85% of weight)
59 resources · 679.4 KiB · 53 third-party Within 1MB page-weight target
JavaScript 63% · 429.0 KiB
Image 30% · 206.8 KiB
Document 3% · 23.7 KiB
CSS 3% · 19.9 KiB

~108.6 KiB of savings available

Remove unused JavaScript: 108.6 KiB
Network Waterfall
59 requests over 2028ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.3 s LCP 1.6 shttps://fc2.com// https://fc2.com/ — 200 — 4.9 KiB — 477 ms — h2https://static.fc2.com/share/css/common.cssstatic.fc2.com/share/css/common.css https://static.fc2.com/share/css/common.css — 200 — 1.1 KiB — 58 ms — h2https://static.fc2.com/share/fc2parts/css/share.cssstatic.fc2.com/share/fc2parts/css/s... https://static.fc2.com/share/fc2parts/css/share.css — 200 — 3.9 KiB — 59 ms — h2https://static.fc2.com/fc2com/css/fc2com_default_140313.cssstatic.fc2.com/fc2com/css/fc2com_de... https://static.fc2.com/fc2com/css/fc2com_default_140313.css — 200 — 6.0 KiB — 73 ms — h2https://static.fc2.com/fc2com/css/fc2com_default_foreign.cssstatic.fc2.com/fc2com/css/fc2com_de... https://static.fc2.com/fc2com/css/fc2com_default_foreign.css — 200 — 562 B — 63 ms — h2https://fc2.com/js/jquery-3.7.1.min.js/js/jquery-3.7.1.min.js https://fc2.com/js/jquery-3.7.1.min.js — 200 — 85.8 KiB — 473 ms — h2https://static.fc2.com/fc2com/js/tab_panel.jsstatic.fc2.com/fc2com/js/tab_panel.... https://static.fc2.com/fc2com/js/tab_panel.js — 200 — 592 B — 79 ms — h2https://static.fc2.com/share/fc2parts/js/common_design.jsstatic.fc2.com/share/fc2parts/js/co... https://static.fc2.com/share/fc2parts/js/common_design.js — 200 — 1.8 KiB — 59 ms — h2https://static.fc2.com/fc2com/js/sp_en.js?130128static.fc2.com/fc2com/js/sp_en.js?1... https://static.fc2.com/fc2com/js/sp_en.js?130128 — 200 — 738 B — 69 ms — h2https://static.fc2.com/fc2com/css/sp.cssstatic.fc2.com/fc2com/css/sp.css https://static.fc2.com/fc2com/css/sp.css — 200 — 676 B — 70 ms — h2https://fc2.com/en/notice.js/en/notice.js https://fc2.com/en/notice.js — 200 — 1.4 KiB — 473 ms — h2https://fc2.com/en/newentry.js/en/newentry.js https://fc2.com/en/newentry.js — 200 — 3.2 KiB — 160 ms — h2https://static.fc2.com/fc2com/image/twitter.pngstatic.fc2.com/fc2com/image/twitter... https://static.fc2.com/fc2com/image/twitter.png — 200 — 2.4 KiB — 34 ms — h2https://static.fc2.com/share/fc2parts/css/fc2footer_languages.cssstatic.fc2.com/share/fc2parts/css/f... https://static.fc2.com/share/fc2parts/css/fc2footer_languages.css — 200 — 1.2 KiB — 20 ms — h2https://gdpr.fc2.com/share/js/gdpr/pp_agreement.pc.en.20180518.jsgdpr.fc2.com/share/js/gdpr/pp_agree... https://gdpr.fc2.com/share/js/gdpr/pp_agreement.pc.en.20180518.js — 200 — 2.3 KiB — 491 ms — http/1.1https://media.fc2.com/counter_img.php?id=2930media.fc2.com/counter_img.php?id=29... https://media.fc2.com/counter_img.php?id=2930 — 200 — 346 B — 699 ms — http/1.1https://static.fc2.com/share/fc2footermenu/blank.gifstatic.fc2.com/share/fc2footermenu/... https://static.fc2.com/share/fc2footermenu/blank.gif — 200 — 419 B — 20 ms — h2https://media.fc2.com/counter_img.php?id=2660media.fc2.com/counter_img.php?id=26... https://media.fc2.com/counter_img.php?id=2660 — 200 — 346 B — 703 ms — http/1.1https://fc2.com/fc2dc/footer.js/fc2dc/footer.js https://fc2.com/fc2dc/footer.js — 200 — 2.2 KiB — 158 ms — h2https://connect.facebook.net/en_US/all.jsconnect.facebook.net/en_US/all.js https://connect.facebook.net/en_US/all.js — 200 — 1.8 KiB — 69 ms — h3https://media5.fc2.com/1303/media5.fc2.com/1303/ https://media5.fc2.com/1303/ — 200 — 1.1 KiB — 517 ms — http/1.1https://static.fc2.com/share/fc2parts/image/header_bar.pngstatic.fc2.com/share/fc2parts/image... https://static.fc2.com/share/fc2parts/image/header_bar.png — 200 — 527 B — 19 ms — h2https://media5.fc2.com/1304/media5.fc2.com/1304/ https://media5.fc2.com/1304/ — 200 — 1.1 KiB — 503 ms — http/1.1https://static.fc2.com/fc2com/img/fc2_logo.gif.pngstatic.fc2.com/fc2com/img/fc2_logo.... https://static.fc2.com/fc2com/img/fc2_logo.gif.png — 200 — 4.6 KiB — 23 ms — h2https://static.fc2.com/fc2com/img/header_menu-back.jpgstatic.fc2.com/fc2com/img/header_me... https://static.fc2.com/fc2com/img/header_menu-back.jpg — 200 — 20.4 KiB — 57 ms — h2https://static.fc2.com/fc2com/img/fc2_service_icon.pngstatic.fc2.com/fc2com/img/fc2_servi... https://static.fc2.com/fc2com/img/fc2_service_icon.png — 200 — 40.7 KiB — 32 ms — h2https://static.fc2.com/share/fc2parts/image/share_parts.pngstatic.fc2.com/share/fc2parts/image... https://static.fc2.com/share/fc2parts/image/share_parts.png — 200 — 129.1 KiB — 61 ms — h2https://ssl.google-analytics.com/ga.jsssl.google-analytics.com/ga.js https://ssl.google-analytics.com/ga.js — 200 — 17.4 KiB — 100 ms — h2https://static.fc2.com/share/image/footerbg.pngstatic.fc2.com/share/image/footerbg... https://static.fc2.com/share/image/footerbg.png — 200 — 462 B — 29 ms — h2https://static.fc2.com/share/image/fc2_logo.pngstatic.fc2.com/share/image/fc2_logo... https://static.fc2.com/share/image/fc2_logo.png — 200 — 1.0 KiB — 30 ms — h2
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.3 s LCP 1.6 shttps://fc2.com// https://fc2.com/ — 200 — 4.9 KiB — 477 ms — h2https://static.fc2.com/share/css/common.cssstatic.fc2.com/share/css/common.css https://static.fc2.com/share/css/common.css — 200 — 1.1 KiB — 58 ms — h2https://static.fc2.com/share/fc2parts/css/share.cssstatic.fc2.com/share/fc2parts/css/s... https://static.fc2.com/share/fc2parts/css/share.css — 200 — 3.9 KiB — 59 ms — h2https://static.fc2.com/fc2com/css/fc2com_default_140313.cssstatic.fc2.com/fc2com/css/fc2com_de... https://static.fc2.com/fc2com/css/fc2com_default_140313.css — 200 — 6.0 KiB — 73 ms — h2https://static.fc2.com/fc2com/css/fc2com_default_foreign.cssstatic.fc2.com/fc2com/css/fc2com_de... https://static.fc2.com/fc2com/css/fc2com_default_foreign.css — 200 — 562 B — 63 ms — h2https://fc2.com/js/jquery-3.7.1.min.js/js/jquery-3.7.1.min.js https://fc2.com/js/jquery-3.7.1.min.js — 200 — 85.8 KiB — 473 ms — h2https://static.fc2.com/fc2com/js/tab_panel.jsstatic.fc2.com/fc2com/js/tab_panel.... https://static.fc2.com/fc2com/js/tab_panel.js — 200 — 592 B — 79 ms — h2https://static.fc2.com/share/fc2parts/js/common_design.jsstatic.fc2.com/share/fc2parts/js/co... https://static.fc2.com/share/fc2parts/js/common_design.js — 200 — 1.8 KiB — 59 ms — h2https://static.fc2.com/fc2com/js/sp_en.js?130128static.fc2.com/fc2com/js/sp_en.js?1... https://static.fc2.com/fc2com/js/sp_en.js?130128 — 200 — 738 B — 69 ms — h2https://static.fc2.com/fc2com/css/sp.cssstatic.fc2.com/fc2com/css/sp.css https://static.fc2.com/fc2com/css/sp.css — 200 — 676 B — 70 ms — h2https://fc2.com/en/notice.js/en/notice.js https://fc2.com/en/notice.js — 200 — 1.4 KiB — 473 ms — h2https://fc2.com/en/newentry.js/en/newentry.js https://fc2.com/en/newentry.js — 200 — 3.2 KiB — 160 ms — h2https://static.fc2.com/fc2com/image/twitter.pngstatic.fc2.com/fc2com/image/twitter... https://static.fc2.com/fc2com/image/twitter.png — 200 — 2.4 KiB — 34 ms — h2https://static.fc2.com/share/fc2parts/css/fc2footer_languages.cssstatic.fc2.com/share/fc2parts/css/f... https://static.fc2.com/share/fc2parts/css/fc2footer_languages.css — 200 — 1.2 KiB — 20 ms — h2https://gdpr.fc2.com/share/js/gdpr/pp_agreement.pc.en.20180518.jsgdpr.fc2.com/share/js/gdpr/pp_agree... https://gdpr.fc2.com/share/js/gdpr/pp_agreement.pc.en.20180518.js — 200 — 2.3 KiB — 491 ms — http/1.1https://media.fc2.com/counter_img.php?id=2930media.fc2.com/counter_img.php?id=29... https://media.fc2.com/counter_img.php?id=2930 — 200 — 346 B — 699 ms — http/1.1https://static.fc2.com/share/fc2footermenu/blank.gifstatic.fc2.com/share/fc2footermenu/... https://static.fc2.com/share/fc2footermenu/blank.gif — 200 — 419 B — 20 ms — h2https://media.fc2.com/counter_img.php?id=2660media.fc2.com/counter_img.php?id=26... https://media.fc2.com/counter_img.php?id=2660 — 200 — 346 B — 703 ms — http/1.1https://fc2.com/fc2dc/footer.js/fc2dc/footer.js https://fc2.com/fc2dc/footer.js — 200 — 2.2 KiB — 158 ms — h2https://connect.facebook.net/en_US/all.jsconnect.facebook.net/en_US/all.js https://connect.facebook.net/en_US/all.js — 200 — 1.8 KiB — 69 ms — h3https://media5.fc2.com/1303/media5.fc2.com/1303/ https://media5.fc2.com/1303/ — 200 — 1.1 KiB — 517 ms — http/1.1https://static.fc2.com/share/fc2parts/image/header_bar.pngstatic.fc2.com/share/fc2parts/image... https://static.fc2.com/share/fc2parts/image/header_bar.png — 200 — 527 B — 19 ms — h2https://media5.fc2.com/1304/media5.fc2.com/1304/ https://media5.fc2.com/1304/ — 200 — 1.1 KiB — 503 ms — http/1.1https://static.fc2.com/fc2com/img/fc2_logo.gif.pngstatic.fc2.com/fc2com/img/fc2_logo.... https://static.fc2.com/fc2com/img/fc2_logo.gif.png — 200 — 4.6 KiB — 23 ms — h2https://static.fc2.com/fc2com/img/header_menu-back.jpgstatic.fc2.com/fc2com/img/header_me... https://static.fc2.com/fc2com/img/header_menu-back.jpg — 200 — 20.4 KiB — 57 ms — h2https://static.fc2.com/fc2com/img/fc2_service_icon.pngstatic.fc2.com/fc2com/img/fc2_servi... https://static.fc2.com/fc2com/img/fc2_service_icon.png — 200 — 40.7 KiB — 32 ms — h2https://static.fc2.com/share/fc2parts/image/share_parts.pngstatic.fc2.com/share/fc2parts/image... https://static.fc2.com/share/fc2parts/image/share_parts.png — 200 — 129.1 KiB — 61 ms — h2https://ssl.google-analytics.com/ga.jsssl.google-analytics.com/ga.js https://ssl.google-analytics.com/ga.js — 200 — 17.4 KiB — 100 ms — h2https://static.fc2.com/share/image/footerbg.pngstatic.fc2.com/share/image/footerbg... https://static.fc2.com/share/image/footerbg.png — 200 — 462 B — 29 ms — h2https://static.fc2.com/share/image/fc2_logo.pngstatic.fc2.com/share/image/fc2_logo... https://static.fc2.com/share/image/fc2_logo.png — 200 — 1.0 KiB — 30 ms — h2https://static.fc2.com/share/css/gdpr/pc/CoZ9Nu8Z.min.cssstatic.fc2.com/share/css/gdpr/pc/Co... https://static.fc2.com/share/css/gdpr/pc/CoZ9Nu8Z.min.css — 200 — 1.1 KiB — 19 ms — h2https://connect.facebook.net/en_US/all.js?hash=9c14cb89f82536b5d0b8ca26bf5baed9connect.facebook.net/en_US/all.js?h... https://connect.facebook.net/en_US/all.js?hash=9c14cb89f82536b5d0b8ca26bf5baed9 — 200 — 82.6 KiB — 55 ms — h3https://www.facebook.com/plugins/like_box.php?app_id=&channel=https%3A%2F%2Fstaticxx.facebook.com%2Fx%2Fconnect%2Fxd_arbiter%2F%3Fversion%3D46%23cb%3Df9b1072c64430ab7c%26domain%3Dfc2.com%26is_canvas%3Dfalse%26origin%3Dhttps%253A%252F%252Ffc2.com%252Ff2754269ba5c874aa%26relation%3Dparent.parent&container_width=200&header=false&href=https%3A%2F%2Ffacebook.com%2Fblog.fc2&locale=en_US&sdk=joey&show_faces=false&stream=false&width=200www.facebook.com/plugins/like_box.p... https://www.facebook.com/plugins/like_box.php?app_id=&channel=https%3A%2F%2Fstaticxx.facebook.com%2Fx%2Fconnect%2Fxd_arbiter%2F%3Fversion%3D46%23cb%3Df9b1072c64430ab7c%26domain%3Dfc2.com%26is_canvas%3Dfalse%26origin%3Dhttps%253A%252F%252Ffc2.com%252Ff2754269ba5c874aa%26relation%3Dparent.parent&container_width=200&header=false&href=https%3A%2F%2Ffacebook.com%2Fblog.fc2&locale=en_US&sdk=joey&show_faces=false&stream=false&width=200 — 200 — 15.2 KiB — 219 ms — h3https://fc2.com/fc2dc/footer.html/fc2dc/footer.html https://fc2.com/fc2dc/footer.html — 200 — 1.5 KiB — 159 ms — h2https://static.fc2.com/fc2com/img/info_title_back.gif.pngstatic.fc2.com/fc2com/img/info_titl... https://static.fc2.com/fc2com/img/info_title_back.gif.png — 200 — 1.3 KiB — 23 ms — h2https://ssl.google-analytics.com/r/__utm.gif?utmwv=5.7.2&utms=1&utmn=344224185&utmhn=fc2.com&utmcs=UTF-8&utmsr=800x600&utmvp=1350x940&utmsc=24-bit&utmul=en-us&utmje=0&utmfl=-&utmdt=FC2%20-%20Free%20Website%2C%20Analyzer%2C%20Blog%2C%20Rental%20Server%2C%20SEO%20Countermeasures%2C%20etc.%20-&utmhid=1723656544&utmr=-&utmp=%2F&utmht=1776799072242&utmac=UA-38220905-1&utmcc=__utma%3D168497334.1170900999.1776799072.1776799072.1776799072.1%3B%2B__utmz%3D168497334.1776799072.1.1.utmcsr%3D(direct)%7Cutmccn%3D(direct)%7Cutmcmd%3D(none)%3B&utmjid=399026942&utmredir=1&utmu=qAAAAAAAAAAAAAAAAAAAAAAE~ssl.google-analytics.com/r/__utm.gi... 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h2https://ssl.google-analytics.com/__utm.gif?utmwv=5.7.2&utms=2&utmn=661320983&utmhn=fc2.com&utmcs=UTF-8&utmsr=800x600&utmvp=1350x940&utmsc=24-bit&utmul=en-us&utmje=0&utmfl=-&utmdt=FC2%20-%20Free%20Website%2C%20Analyzer%2C%20Blog%2C%20Rental%20Server%2C%20SEO%20Countermeasures%2C%20etc.%20-&utmhid=1723656544&utmr=-&utmp=%2F&utmht=1776799072245&utmac=UA-12020025-9&utmcc=__utma%3D168497334.1170900999.1776799072.1776799072.1776799072.1%3B%2B__utmz%3D168497334.1776799072.1.1.utmcsr%3D(direct)%7Cutmccn%3D(direct)%7Cutmcmd%3D(none)%3B&utmjid=&utmmt=1&utmu=qAAAAAAAAAAAAAAAAAAAAAAE~ssl.google-analytics.com/__utm.gif?... 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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
49% of JavaScript execution is third-party
First-party Third-party 81ms · 0KB · $1/mo
Unattributable
Other
Optional
Execution 81ms
Transfer 0 KB
Monthly Cost $1/mo

49% 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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