Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

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

Mobile Desktop

Performance

Accessibility

Best Practices

SEO

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

2.60 s

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

4.34 s

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

17.95 s

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

0.042

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

14.82 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.

57.96 s

Page Load Progression

1.1 s

2.2 s

3.3 s

4.4 s

5.6 s

6.7 s

7.8 s

8.9 s

Checks

7 PASS 3 REVIEW 4 FIX

Page Weight Budget

Action

6.3 MB transferred, 422 requests

FIX

6.3 MB transferred, 422 requests

Page weighs 17.8 MB (6.3 MB transferred)

JavaScript is 5.0 MB — consider code splitting or lazy loading

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Got: 5.0 MB

422 HTTP requests — consider bundling or reducing

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Estimated 1.3 g CO2 per page load

6.3 MB transferred

422 requests

1.3 g CO2 per page load

JavaScript 5.0 MiB 80%

Images 1009.0 KiB 16%

Fonts 116.5 KiB 2%

HTML 62.1 KiB 1%

Other 53.1 KiB 1%

Other 34.0 KiB 1%

Other 25.7 KiB 0%

CSS 19.2 KiB 0%

Other 5.5 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

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

Third-Party Impact

Action

100% third-party, 0 ms blocking

FIX

100% third-party, 0 ms blocking

Third-party code accounts for 100% of page weight (6.3 MiB of 6.3 MiB)

Third-party blocking time is low (0 ms)

100%

First-party Third-party

JS Execution Cost

Action

42349ms total JS execution

FIX

42349ms total JS execution

https://www.asahi.com/sp/: 14572ms CPU time

https://cdn.cxense.com/cx.js: 6335ms CPU time

Unattributable: 3174ms CPU time

https://fundingchoicesmessages.google.com/f/AGSKWx...: 2968ms CPU time

https://securepubads.g.doubleclick.net/pagead/mana...: 1155ms CPU time

Third-party scripts: 27777ms (66% of total)

Main Thread Breakdown

Style & Layout 52% Script Evaluation 33% Other 8% Script Parsing & Compilation 4%

Script	Total	Scripting	Parse/Compile	Party
https://www.asahi.com/sp/	14572ms	62ms	11ms	1st
https://cdn.cxense.com/cx.js	6335ms	599ms	11ms	3rd
Unattributable	3174ms	404ms	0ms	3rd
https://fundingchoicesmessages.google.com/f/AGSKWxVwM7q84JBfaB6GpC-BcOBXGWnyRG9sZ6lLxQXQxxtPoZCjlELr1GvB2HrkQ6ZWu2MVIkCAaZ_TIyF_4uRh1JGzO185kUUPbjf8J7IcGUTlXBdlLAJqwItOheCvAPponq6t5G4BYg==?fccs=W251bGwsbnVsbCxudWxsLG51bGwsbnVsbCxudWxsLFsxNzc1NTkyODkyLDMyODAwMDAwMF0sbnVsbCxudWxsLG51bGwsW251bGwsWzddXSwiaHR0cHM6Ly93d3cuYXNhaGkuY29tL3NwLyIsbnVsbCxbWzgsInlFQ3NHYndMaHhJIl0sWzksImVuLVVTIl0sWzE4LCJbW1tudWxsLDI3NThdXV0iXSxbMzUsIjE3NzU1OTI4OTIiXSxbMTksIjEiXSxbMTcsIlswXSJdLFsyNCwiIl0sWzI5LCJmYWxzZSJdXV0	2968ms	228ms	42ms	3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604020101/pubads_impl.js	1155ms	1070ms	48ms	3rd
https://www.googletagmanager.com/gtm.js?id=GTM-K4N7QLF&gtm=4e6460	1094ms	903ms	65ms	3rd
https://www.googletagmanager.com/gtm.js?id=GTM-K38TZKV	1083ms	918ms	72ms	3rd
https://js.hs-analytics.net/analytics/1775592600000/6493544.js	828ms	549ms	11ms	3rd
https://code.piano.io/api/tinypass.min.js	614ms	454ms	75ms	3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PJMVNDRF&l=itm_dl1_1024763	510ms	304ms	43ms	3rd

Showing top 10 of 64 scripts

JS Bundles

Action

129 scripts, 1.8 MB unused

FIX

129 scripts, 1.8 MB unused

https://securepubads.g.doubleclick.net/pagead/mana...: 126 KB unused (69%)

Consider code splitting or tree shaking to reduce unused code.

https://code.piano.io/api/tinypass.min.js: 83 KB unused (63%)

Consider code splitting or tree shaking to reduce unused code.

https://www.googletagmanager.com/gtag/destination?...: 67 KB unused (47%)

Consider code splitting or tree shaking to reduce unused code.

https://www.googletagmanager.com/gtag/destination?...: 67 KB unused (47%)

Consider code splitting or tree shaking to reduce unused code.

https://www.googletagmanager.com/gtm.js?id=GTM-KX3...: 67 KB unused (48%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 1.8 MB

1871 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604020101/pubads_impl.js	183 KB	126 KB (69%)	✓	3rd
https://code.piano.io/api/tinypass.min.js	132 KB	83 KB (63%)	✓	3rd
https://www.googletagmanager.com/gtag/destination?id=AW-471014979&cx=c&gtm=4e6460	144 KB	67 KB (47%)	✓	3rd
https://www.googletagmanager.com/gtag/destination?id=AW-770377591&cx=c&gtm=4e6460	144 KB	67 KB (47%)	✓	3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KX3Q99SS&l=itm_dl1_1014416	139 KB	67 KB (48%)	✓	3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PJMVNDRF&l=itm_dl1_1024763	139 KB	67 KB (48%)	✓	3rd
https://www.googletagmanager.com/gtm.js?id=GTM-52RGTRCX&l=itm_dl1_1020617	114 KB	66 KB (58%)	✓	3rd
https://www.googletagmanager.com/gtag/destination?id=AW-10841393910&cx=c&gtm=4e6460	137 KB	66 KB (48%)	✓	3rd
https://www.googletagmanager.com/gtag/destination?id=AW-16679320228&cx=c&gtm=4e6460	137 KB	66 KB (48%)	✓	3rd
https://www.googletagmanager.com/gtag/destination?id=AW-953010434&cx=c&gtm=4e6460	133 KB	66 KB (49%)	✓	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

Image Optimization

Action

125 images, 0 KB saveable

REVIEW

125 images, 0 KB saveable

https://www.asahicom.jp/images/logo/top/logo_and.s... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://www.asahicom.jp/images/logo/top/logo_globe... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://www.asahicom.jp/images/logo/top/logo_asm.s... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://www.asahicom.jp/images/logo_Think_Campus.p... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://www.asahicom.jp/images/icon/top/icon__movi... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://www.asahicom.jp/images/icon/top/icon__keyG... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://www.asahicom.jp/images/logo/top/logo_reron... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

125 images 1009 KB

0 oversized -0 KB

125 legacy format

7 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

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

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

HTTP Caching

max-age=0, no-cache

REVIEW

max-age=0, no-cache

Cache-Control header is set

Got: max-age=0, no-cache

ETag present — enables conditional (304) responses

Cache-Control

max-age=0, no-cache

Directive	Value	Meaning
max-age	0	Cache for 0 seconds
no-cache	—	Cache but always revalidate first

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

A+

Font Loading

5 fonts (117 KB)

PASS

5 fonts (117 KB)

5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

117 KB total

Render-blocking

of 5

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

KFOMCnqEu92Fr1ME7kSn66a... woff2 swap

Size 15 KB

Load time 0 ms

Start 0 ms

Risk FOUT — text flashes from fallback to web font

KFOMCnqEu92Fr1ME7kSn66a... woff2 swap

Size 7 KB

Load time 0 ms

Start 0 ms

Risk FOUT — text flashes from fallback to web font

KFO7CnqEu92Fr1ME7kSn66a... woff2 swap

Size 37 KB

Load time 0 ms

Start 0 ms

Risk FOUT — text flashes from fallback to web font

KFO7CnqEu92Fr1ME7kSn66a... woff2 swap

Size 16 KB

Load time 0 ms

Start 0 ms

Risk FOUT — text flashes from fallback to web font

memvYaGs126MiZpBA-UvWbX... woff2 swap

Size 42 KB

Load time 0 ms

Start 0 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

No caching issues found

All static resources have appropriate caching headers.

A+

Critical Rendering Path

No render-blocking resources

PASS

No render-blocking resources

No render-blocking resources detected

A+

Resource Hints

No optimization needed

PASS

No optimization needed

No resource hint issues

A+

Render-Blocking Resources

No render-blocking resources detected

PASS

No render-blocking resources detected

No render-blocking resources detected in <head>

A+

Third-Party Resources

No third-party resources detected

PASS

No third-party resources detected

Network Waterfall

422 requests over 0ms

INFO

Performance analysis not available for this result.

Third-Party Script Cost

Per-script blocking time, transfer cost, and cache headers

INFO

66% of JavaScript execution is third-party

First-party Third-party 27777ms · 4856KB · ¥165/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
cdn.cxense.com cdn.cxense.com	Other	6335ms	38 KB	—	¥38/mo	Costly
Unattributable Unattributable	Other	3174ms	0 KB	—	¥19/mo	Costly
fundingchoicesmessages.google.com fundingchoicesmessages.google.com	Other	2968ms	68 KB	—	¥18/mo	Costly
securepubads.g.doubleclick.net securepubads.g.doubleclick.net	Other	1155ms	183 KB	69%	¥7/mo	Costly
Google Tag Manager www.googletagmanager.com	Tag Manager	1094ms	176 KB	31%	¥6/mo	Costly
Google Tag Manager www.googletagmanager.com	Tag Manager	1083ms	197 KB	30%	¥6/mo	Costly
HubSpot Analytics js.hs-analytics.net	Analytics	828ms	42 KB	—	¥5/mo	Costly
code.piano.io code.piano.io	Other	614ms	132 KB	63%	¥4/mo	Costly
Google Tag Manager www.googletagmanager.com	Tag Manager	510ms	139 KB	48%	¥3/mo	Costly
Google Tag Manager www.googletagmanager.com	Tag Manager	462ms	166 KB	39%	¥3/mo	Costly
micro.rubiconproject.com micro.rubiconproject.com	Other	427ms	195 KB	32%	¥3/mo	Costly
Google Tag Manager www.googletagmanager.com	Tag Manager	404ms	173 KB	34%	¥2/mo	Costly
Facebook Pixel connect.facebook.net	Advertising	357ms	97 KB	27%	¥2/mo	Costly
fundingchoicesmessages.google.com fundingchoicesmessages.google.com	Other	346ms	70 KB	52%	¥2/mo	Costly
Google Tag Manager www.googletagmanager.com	Tag Manager	303ms	143 KB	42%	¥2/mo	Costly
Google Tag Manager www.googletagmanager.com	Tag Manager	302ms	144 KB	47%	¥2/mo	Costly
cdn.binsiad.com cdn.binsiad.com	Other	279ms	25 KB	—	¥2/mo	Costly
analytics.tiktok.com analytics.tiktok.com	Other	278ms	106 KB	54%	¥2/mo	Costly
Twitter/X Pixel static.ads-twitter.com	Advertising	272ms	13 KB	—	¥2/mo	Costly
Google Tag Manager www.googletagmanager.com	Tag Manager	257ms	144 KB	47%	¥2/mo	Costly
Google Tag Manager www.googletagmanager.com	Tag Manager	254ms	137 KB	48%	¥2/mo	Costly
Google Tag Manager www.googletagmanager.com	Tag Manager	251ms	137 KB	48%	¥1/mo	Costly
dynamic.criteo.com dynamic.criteo.com	Other	249ms	25 KB	—	¥1/mo	Costly
Google Tag Manager www.googletagmanager.com	Tag Manager	248ms	143 KB	42%	¥1/mo	Costly
Google Tag Manager www.googletagmanager.com	Tag Manager	242ms	137 KB	48%	¥1/mo	Costly
Google Tag Manager www.googletagmanager.com	Tag Manager	241ms	133 KB	49%	¥1/mo	Costly
Google Tag Manager www.googletagmanager.com	Tag Manager	236ms	137 KB	48%	¥1/mo	Costly
Google Tag Manager www.googletagmanager.com	Tag Manager	221ms	139 KB	48%	¥1/mo	Costly
Google Tag Manager www.googletagmanager.com	Tag Manager	220ms	133 KB	49%	¥1/mo	Costly
Google Tag Manager www.googletagmanager.com	Tag Manager	220ms	137 KB	48%	¥1/mo	Costly
Facebook Pixel connect.facebook.net	Advertising	208ms	22 KB	—	¥1/mo	Costly
c.amazon-adsystem.com c.amazon-adsystem.com	Other	207ms	90 KB	43%	¥1/mo	Costly
Google Tag Manager www.googletagmanager.com	Tag Manager	189ms	133 KB	49%	¥1/mo	Optional
Google Tag Manager www.googletagmanager.com	Tag Manager	186ms	137 KB	48%	¥1/mo	Optional
static.chartbeat.com static.chartbeat.com	Other	176ms	16 KB	—	¥1/mo	Optional
rumcdn.geoedge.be rumcdn.geoedge.be	Other	175ms	7 KB	—	¥1/mo	Optional
Facebook Pixel connect.facebook.net	Advertising	167ms	78 KB	63%	¥1/mo	Optional
img.ak.impact-ad.jp img.ak.impact-ad.jp	Other	165ms	42 KB	—	¥1/mo	Optional
Facebook Pixel connect.facebook.net	Advertising	165ms	39 KB	—	¥1/mo	Optional
Facebook Pixel connect.facebook.net	Advertising	163ms	95 KB	30%	¥1/mo	Optional
Google Tag Manager www.googletagmanager.com	Tag Manager	160ms	114 KB	58%	¥1/mo	Optional
Facebook Pixel connect.facebook.net	Advertising	157ms	15 KB	—	¥1/mo	Optional
js.hubspot.com js.hubspot.com	Other	132ms	28 KB	—	¥1/mo	Optional
www.asahicom.jp www.asahicom.jp	Other	131ms	38 KB	—	¥1/mo	Optional
www.asahicom.jp www.asahicom.jp	Other	125ms	11 KB	—	¥1/mo	Optional
id-ap.piano.io id-ap.piano.io	Other	123ms	1 KB	—	¥1/mo	Optional
widgets.outbrain.com widgets.outbrain.com	Other	119ms	110 KB	80%	¥1/mo	Optional
contents.comment.digital.asahi.com contents.comment.digital.asahi.com	Other	100ms	3 KB	—	¥1/mo	Optional
www.asahicom.jp www.asahicom.jp	Other	99ms	33 KB	—	¥1/mo	Optional
s.yimg.jp s.yimg.jp	Other	98ms	12 KB	—	¥1/mo	Optional
Facebook Pixel connect.facebook.net	Advertising	83ms	18 KB	—	¥0/mo	Optional
d.line-scdn.net d.line-scdn.net	Other	80ms	10 KB	—	¥0/mo	Optional
cdn.smartnews-ads.com cdn.smartnews-ads.com	Other	80ms	3 KB	—	¥0/mo	Optional
securepubads.g.doubleclick.net securepubads.g.doubleclick.net	Other	78ms	34 KB	—	¥0/mo	Optional
cdn.id5-sync.com cdn.id5-sync.com	Other	78ms	34 KB	—	¥0/mo	Optional
Facebook Pixel connect.facebook.net	Advertising	76ms	15 KB	—	¥0/mo	Optional
js.hs-banner.com js.hs-banner.com	Other	66ms	21 KB	—	¥0/mo	Optional
img.ak.impact-ad.jp img.ak.impact-ad.jp	Other	65ms	11 KB	—	¥0/mo	Optional
cdn.hera.d2c.ne.jp cdn.hera.d2c.ne.jp	Other	64ms	7 KB	—	¥0/mo	Optional
analytics.tiktok.com analytics.tiktok.com	Other	62ms	40 KB	—	¥0/mo	Optional
js.usemessages.com js.usemessages.com	Other	58ms	33 KB	—	¥0/mo	Optional
cdn.treasuredata.com cdn.treasuredata.com	Other	55ms	21 KB	—	¥0/mo	Optional
rumcdn.geoedge.be rumcdn.geoedge.be	Other	54ms	80 KB	—	¥0/mo	Optional

cdn.cxense.com

Other

Costly

Execution 6335ms

Transfer 38 KB

Monthly Cost ¥38/mo

Unattributable

Other

Costly

Execution 3174ms

Transfer 0 KB

Monthly Cost ¥19/mo

fundingchoicesmessages.google.com

Other

Costly

Execution 2968ms

Transfer 68 KB

Monthly Cost ¥18/mo

securepubads.g.doubleclick.net

Other

Costly

Execution 1155ms

Transfer 183 KB

Unused 69%

Monthly Cost ¥7/mo

Google Tag Manager

Tag Manager

Costly

Execution 1094ms

Transfer 176 KB

Unused 31%

Monthly Cost ¥6/mo

Google Tag Manager

Tag Manager

Costly

Execution 1083ms

Transfer 197 KB

Unused 30%

Monthly Cost ¥6/mo

HubSpot Analytics

Analytics

Costly

Execution 828ms

Transfer 42 KB

Monthly Cost ¥5/mo

code.piano.io

Other

Costly

Execution 614ms

Transfer 132 KB

Unused 63%

Monthly Cost ¥4/mo

Google Tag Manager

Tag Manager

Costly

Execution 510ms

Transfer 139 KB

Unused 48%

Monthly Cost ¥3/mo

Google Tag Manager

Tag Manager

Costly

Execution 462ms

Transfer 166 KB

Unused 39%

Monthly Cost ¥3/mo

micro.rubiconproject.com

Other

Costly

Execution 427ms

Transfer 195 KB

Unused 32%

Monthly Cost ¥3/mo

Google Tag Manager

Tag Manager

Costly

Execution 404ms

Transfer 173 KB

Unused 34%

Monthly Cost ¥2/mo

Facebook Pixel

Advertising

Costly

Execution 357ms

Transfer 97 KB

Unused 27%

Monthly Cost ¥2/mo

fundingchoicesmessages.google.com

Other

Costly

Execution 346ms

Transfer 70 KB

Unused 52%

Monthly Cost ¥2/mo

Google Tag Manager

Tag Manager

Costly

Execution 303ms

Transfer 143 KB

Unused 42%

Monthly Cost ¥2/mo

Google Tag Manager

Tag Manager

Costly

Execution 302ms

Transfer 144 KB

Unused 47%

Monthly Cost ¥2/mo

cdn.binsiad.com

Other

Costly

Execution 279ms

Transfer 25 KB

Monthly Cost ¥2/mo

analytics.tiktok.com

Other

Costly

Execution 278ms

Transfer 106 KB

Unused 54%

Monthly Cost ¥2/mo

Twitter/X Pixel

Advertising

Costly

Execution 272ms

Transfer 13 KB

Monthly Cost ¥2/mo

Google Tag Manager

Tag Manager

Costly

Execution 257ms

Transfer 144 KB

Unused 47%

Monthly Cost ¥2/mo

Google Tag Manager

Tag Manager

Costly

Execution 254ms

Transfer 137 KB

Unused 48%

Monthly Cost ¥2/mo

Google Tag Manager

Tag Manager

Costly

Execution 251ms

Transfer 137 KB

Unused 48%

Monthly Cost ¥1/mo

dynamic.criteo.com

Other

Costly

Execution 249ms

Transfer 25 KB

Monthly Cost ¥1/mo

Google Tag Manager

Tag Manager

Costly

Execution 248ms

Transfer 143 KB

Unused 42%

Monthly Cost ¥1/mo

Google Tag Manager

Tag Manager

Costly

Execution 242ms

Transfer 137 KB

Unused 48%

Monthly Cost ¥1/mo

Google Tag Manager

Tag Manager

Costly

Execution 241ms

Transfer 133 KB

Unused 49%

Monthly Cost ¥1/mo

Google Tag Manager

Tag Manager

Costly

Execution 236ms

Transfer 137 KB

Unused 48%

Monthly Cost ¥1/mo

Google Tag Manager

Tag Manager

Costly

Execution 221ms

Transfer 139 KB

Unused 48%

Monthly Cost ¥1/mo

Google Tag Manager

Tag Manager

Costly

Execution 220ms

Transfer 133 KB

Unused 49%

Monthly Cost ¥1/mo

Google Tag Manager

Tag Manager

Costly

Execution 220ms

Transfer 137 KB

Unused 48%

Monthly Cost ¥1/mo

Facebook Pixel

Advertising

Costly

Execution 208ms

Transfer 22 KB

Monthly Cost ¥1/mo

c.amazon-adsystem.com

Other

Costly

Execution 207ms

Transfer 90 KB

Unused 43%

Monthly Cost ¥1/mo

Google Tag Manager

Tag Manager

Optional

Execution 189ms

Transfer 133 KB

Unused 49%

Monthly Cost ¥1/mo

Google Tag Manager

Tag Manager

Optional

Execution 186ms

Transfer 137 KB

Unused 48%

Monthly Cost ¥1/mo

static.chartbeat.com

Other

Optional

Execution 176ms

Transfer 16 KB

Monthly Cost ¥1/mo

rumcdn.geoedge.be

Other

Optional

Execution 175ms

Transfer 7 KB

Monthly Cost ¥1/mo

Facebook Pixel

Advertising

Optional

Execution 167ms

Transfer 78 KB

Unused 63%

Monthly Cost ¥1/mo

img.ak.impact-ad.jp

Other

Optional

Execution 165ms

Transfer 42 KB

Monthly Cost ¥1/mo

Facebook Pixel

Advertising

Optional

Execution 165ms

Transfer 39 KB

Monthly Cost ¥1/mo

Facebook Pixel

Advertising

Optional

Execution 163ms

Transfer 95 KB

Unused 30%

Monthly Cost ¥1/mo

Google Tag Manager

Tag Manager

Optional

Execution 160ms

Transfer 114 KB

Unused 58%

Monthly Cost ¥1/mo

Facebook Pixel

Advertising

Optional

Execution 157ms

Transfer 15 KB

Monthly Cost ¥1/mo

js.hubspot.com

Other

Optional

Execution 132ms

Transfer 28 KB

Monthly Cost ¥1/mo

www.asahicom.jp

Other

Optional

Execution 131ms

Transfer 38 KB

Monthly Cost ¥1/mo

www.asahicom.jp

Other

Optional

Execution 125ms

Transfer 11 KB

Monthly Cost ¥1/mo

id-ap.piano.io

Other

Optional

Execution 123ms

Transfer 1 KB

Monthly Cost ¥1/mo

widgets.outbrain.com

Other

Optional

Execution 119ms

Transfer 110 KB

Unused 80%

Monthly Cost ¥1/mo

contents.comment.digital.asahi.com

Other

Optional

Execution 100ms

Transfer 3 KB

Monthly Cost ¥1/mo

www.asahicom.jp

Other

Optional

Execution 99ms

Transfer 33 KB

Monthly Cost ¥1/mo

s.yimg.jp

Other

Optional

Execution 98ms

Transfer 12 KB

Monthly Cost ¥1/mo

Facebook Pixel

Advertising

Optional

Execution 83ms

Transfer 18 KB

Monthly Cost ¥0/mo

d.line-scdn.net

Other

Optional

Execution 80ms

Transfer 10 KB

Monthly Cost ¥0/mo

cdn.smartnews-ads.com

Other

Optional

Execution 80ms

Transfer 3 KB

Monthly Cost ¥0/mo

securepubads.g.doubleclick.net

Other

Optional

Execution 78ms

Transfer 34 KB

Monthly Cost ¥0/mo

cdn.id5-sync.com

Other

Optional

Execution 78ms

Transfer 34 KB

Monthly Cost ¥0/mo

Facebook Pixel

Advertising

Optional

Execution 76ms

Transfer 15 KB

Monthly Cost ¥0/mo

js.hs-banner.com

Other

Optional

Execution 66ms

Transfer 21 KB

Monthly Cost ¥0/mo

img.ak.impact-ad.jp

Other

Optional

Execution 65ms

Transfer 11 KB

Monthly Cost ¥0/mo

cdn.hera.d2c.ne.jp

Other

Optional

Execution 64ms

Transfer 7 KB

Monthly Cost ¥0/mo

analytics.tiktok.com

Other

Optional

Execution 62ms

Transfer 40 KB

Monthly Cost ¥0/mo

js.usemessages.com

Other

Optional

Execution 58ms

Transfer 33 KB

Monthly Cost ¥0/mo

cdn.treasuredata.com

Other

Optional

Execution 55ms

Transfer 21 KB

Monthly Cost ¥0/mo

rumcdn.geoedge.be

Other

Optional

Execution 54ms

Transfer 80 KB

Monthly Cost ¥0/mo

These scripts may cost more than they're worth

cdn.cxense.com adds 6335ms and costs ~¥38/month
Unattributable adds 3174ms and costs ~¥19/month
fundingchoicesmessages.google.com adds 2968ms and costs ~¥18/month
securepubads.g.doubleclick.net adds 1155ms and costs ~¥7/month
Google Tag Manager adds 1094ms and costs ~¥6/month
Google Tag Manager adds 1083ms and costs ~¥6/month
HubSpot Analytics adds 828ms and costs ~¥5/month
code.piano.io adds 614ms and costs ~¥4/month
Google Tag Manager adds 510ms and costs ~¥3/month
Google Tag Manager adds 462ms and costs ~¥3/month
micro.rubiconproject.com adds 427ms and costs ~¥3/month
Google Tag Manager adds 404ms and costs ~¥2/month
Facebook Pixel adds 357ms and costs ~¥2/month
fundingchoicesmessages.google.com adds 346ms and costs ~¥2/month
Google Tag Manager adds 303ms and costs ~¥2/month
Google Tag Manager adds 302ms and costs ~¥2/month
cdn.binsiad.com adds 279ms and costs ~¥2/month
analytics.tiktok.com adds 278ms and costs ~¥2/month
Twitter/X Pixel adds 272ms and costs ~¥2/month
Google Tag Manager adds 257ms and costs ~¥2/month
Google Tag Manager adds 254ms and costs ~¥2/month
Google Tag Manager adds 251ms and costs ~¥1/month
dynamic.criteo.com adds 249ms and costs ~¥1/month
Google Tag Manager adds 248ms and costs ~¥1/month
Google Tag Manager adds 242ms and costs ~¥1/month
Google Tag Manager adds 241ms and costs ~¥1/month
Google Tag Manager adds 236ms and costs ~¥1/month
Google Tag Manager adds 221ms and costs ~¥1/month
Google Tag Manager adds 220ms and costs ~¥1/month
Google Tag Manager adds 220ms and costs ~¥1/month
Facebook Pixel adds 208ms and costs ~¥1/month
c.amazon-adsystem.com adds 207ms and costs ~¥1/month

66% 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

cdn.cxense.com takes 6335ms 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

Unattributable takes 3174ms 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

fundingchoicesmessages.google.com takes 2968ms 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

securepubads.g.doubleclick.net takes 1155ms 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

69% of securepubads.g.doubleclick.net'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

Google Tag Manager takes 1094ms 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 1083ms 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 828ms 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

code.piano.io takes 614ms 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

63% of code.piano.io'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

Google Tag Manager takes 510ms 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 462ms 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

micro.rubiconproject.com takes 427ms 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 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

Facebook Pixel takes 357ms 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

fundingchoicesmessages.google.com takes 346ms 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

52% of fundingchoicesmessages.google.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

Google Tag Manager takes 303ms 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 302ms 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

cdn.binsiad.com takes 279ms 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

analytics.tiktok.com takes 278ms 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

54% of analytics.tiktok.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

Twitter/X Pixel takes 272ms 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 257ms 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 254ms 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 251ms 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

dynamic.criteo.com takes 249ms 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 248ms 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 242ms 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 241ms 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 236ms 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 221ms 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 220ms 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 220ms 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

Facebook Pixel takes 208ms 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

c.amazon-adsystem.com takes 207ms 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

63% of Facebook Pixel'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

58% of Google Tag Manager'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

80% of widgets.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

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.