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https://social-plugins.line.me

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
5
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
29
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
83
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
75
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.

4.89 s

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

8.07 s

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

9.11 s

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

0.034

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

7.69 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.

17.27 s

Page Load Progression

1.2 s
2.4 s
3.6 s
4.8 s
6.0 s
7.2 s
8.4 s
9.6 s
Checks
17
7 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
5.8 MB transferred, 95 requests
FIX
5.8 MB transferred, 95 requests
Critical::
Page weighs 9.8 MB (5.8 MB transferred)
Warning::
JavaScript is 877 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 877 KB
Info::
Fonts are 213 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 213 KB
Info::
95 HTTP requests
Info::
Estimated 1.2 g CO2 per page load
5.8 MB / 2.4 MB budget
5.8 MB transferred
95 requests
1.2 g CO2 per page load
Other 4.2 MiB 74%
JavaScript 876.6 KiB 15%
Fonts 212.5 KiB 4%
Images 199.9 KiB 3%
CSS 188.0 KiB 3%
Other 53.6 KiB 1%
HTML 16.0 KiB 0%
0 2.4 MB 4.9 MB
Over budget

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

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (5.8 MiB of 5.8 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
16916ms total JS execution
FIX
16916ms total JS execution
Warning::
Unattributable: 12993ms CPU time
Warning::
https://developers.line.biz/?r=/docs/line-social-p...: 2076ms CPU time
Warning::
https://developers.line.biz/_nuxt/CLNKnlQW.js: 656ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-K94R...: 557ms CPU time
Warning::
https://developers.line.biz/_nuxt/CrbTXa04.js: 530ms CPU time
Warning::
Third-party scripts: 16916ms (100% of total)

Main Thread Breakdown

Script Evaluation 76% Other 14% Style & Layout 5%
ScriptTotalScriptingParse/CompileParty
Unattributable12993ms11067ms0ms3rd
https://developers.line.biz/?r=/docs/line-social-plugins/2076ms472ms4ms3rd
https://developers.line.biz/_nuxt/CLNKnlQW.js656ms544ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-K94RFW73WS557ms440ms103ms3rd
https://developers.line.biz/_nuxt/CrbTXa04.js530ms455ms1ms3rd
https://developers.line.biz/_nuxt/prkPQDO6.js52ms28ms7ms3rd
https://developers.line.biz/_nuxt/entry.XU__DSq0.css51ms0ms0ms3rd
D
Page Weight Inventory
Action
95 resources · 5.8 MB · 157 KB savings available
FIX
95 resources · 5.8 MB · 157 KB savings available
Warning::
Page weight 4.8 MB over 1MB target
Got: 5.8 MB Expected: ≤ 1 MB
Info::
~157 KB of savings available
Warning::
94 third-party resources (100% of weight)
Info::
4 resources over 200KB
95 resources · 5.8 MiB · 94 third-party 4.8 MiB over 1MB target
Other 74% · 4.2 MiB
JavaScript 15% · 876.6 KiB
Image 4% · 252.5 KiB
Font 4% · 212.5 KiB
CSS 3% · 188.0 KiB
Document 0% · 16.3 KiB

~157.5 KiB of savings available

Remove unused JavaScript: 157.5 KiB
D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: max-age=0, no-cache, no-store
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=0, no-cache, no-store

DirectiveValueMeaning
max-age0Cache for 0 seconds
no-cache—Cache but always revalidate first
no-store—Never cache this response
B
Image Optimization
10 images, 0 KB saveable
REVIEW
10 images, 0 KB saveable
Info::
All images are well-optimized
10 images 200 KB
0 oversized -0 KB
8 legacy format
0 missing dimensions CLS risk
C
JS Bundles
Action
56 scripts, 157 KB unused
REVIEW
56 scripts, 157 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-K94R...: 64 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://developers.line.biz/_nuxt/Cxi3vQKm.js: 38 KB unused (57%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://developers.line.biz/_nuxt/prkPQDO6.js: 32 KB unused (10%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://developers.line.biz/_nuxt/CrbTXa04.js: 23 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 157 KB
157 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-K94RFW73WS157 KB64 KB (41%)✓3rd
https://developers.line.biz/_nuxt/Cxi3vQKm.js67 KB38 KB (57%)✓3rd
https://developers.line.biz/_nuxt/prkPQDO6.js420 KB32 KB (10%)✓3rd
https://developers.line.biz/_nuxt/CrbTXa04.js47 KB23 KB (50%)✓3rd
https://developers.line.biz/_nuxt/Bgms0fH8.js1 KB—✓3rd
https://developers.line.biz/_nuxt/DlAUqK2U.js1 KB—✓3rd
https://developers.line.biz/_nuxt/C-4GxZT9.js4 KB—✓3rd
https://developers.line.biz/_nuxt/szH1qBxF.js13 KB—✓3rd
https://developers.line.biz/_nuxt/DPxYUU_D.js1 KB—✓3rd
https://developers.line.biz/_nuxt/DYgwRWPV.js2 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

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

Green Hosting

No green hosting detected

A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
5 fonts (213 KB)
PASS
5 fonts (213 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

213 KB total

Render-blocking

0

of 5

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 FCP 4.9 s LCP 8.1 shttps://static.line-scdn.net/laicon/edge/latest/fonts/laicon-regular-5c38942e.woff2?18b1b3laicon-regular-5c38942e... https://static.line-scdn.net/laicon/edge/latest/fonts/laicon-regular-5c38942e.woff2?18b1b3 — 62.3 KiB — 321 ms — font-display: swaphttps://static.line-scdn.net/laicon/edge/latest/fonts/laicon-solid-5c38942e.woff2?18b1b3laicon-solid-5c38942e.w... https://static.line-scdn.net/laicon/edge/latest/fonts/laicon-solid-5c38942e.woff2?18b1b3 — 53.9 KiB — 319 ms — font-display: swaphttps://static.line-scdn.net/laicon/edge/latest/fonts/laicon-extrabold-5c38942e.woff2?18b1b3laicon-extrabold-5c3894... https://static.line-scdn.net/laicon/edge/latest/fonts/laicon-extrabold-5c38942e.woff2?18b1b3 — 62.2 KiB — 321 ms — font-display: swaphttps://vos.line-scdn.net/line-developers/docs/assets/fonts/line-seed-sans/WOFF/LINESeedSans_W_XBd.woffLINESeedSans_W_XBd.woff https://vos.line-scdn.net/line-developers/docs/assets/fonts/line-seed-sans/WOFF/LINESeedSans_W_XBd.woff — 17.3 KiB — 1.3 s — font-display: swaphttps://vos.line-scdn.net/line-developers/docs/assets/fonts/line-seed-sans/WOFF/LINESeedSans_W_Bd.woffLINESeedSans_W_Bd.woff https://vos.line-scdn.net/line-developers/docs/assets/fonts/line-seed-sans/WOFF/LINESeedSans_W_Bd.woff — 16.7 KiB — 303 ms — font-display: swap
laicon-regular-5c38942e... woff2 swap
Size 62 KB
Load time 321 ms
Start 2.5 s
Risk FOUT — text flashes from fallback to web font
laicon-solid-5c38942e.w... woff2 swap
Size 54 KB
Load time 319 ms
Start 2.5 s
Risk FOUT — text flashes from fallback to web font
laicon-extrabold-5c3894... woff2 swap
Size 62 KB
Load time 321 ms
Start 2.5 s
Risk FOUT — text flashes from fallback to web font
LINESeedSans_W_XBd.woff woff swap
Size 17 KB
Load time 1.3 s
Start 2.5 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
LINESeedSans_W_Bd.woff woff swap
Size 17 KB
Load time 303 ms
Start 10.2 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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 ~10 KB and ~20 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
1
dns-prefetch
—
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
Network Waterfall
95 requests over 11447ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 4.9 s LCP 8.1 shttps://social-plugins.line.me// https://social-plugins.line.me/ — 301 — 329 B — 259 ms — http/1.1https://developers.line.biz/?r=/docs/line-social-plugins/developers.line.biz/?r=/docs/line-s... https://developers.line.biz/?r=/docs/line-social-plugins/ — 200 — 10.9 KiB — 1.0 s — h2https://fonts.googleapis.com/css2?family=Noto+Sans+JP&display=swapfonts.googleapis.com/css2?family=No... https://fonts.googleapis.com/css2?family=Noto+Sans+JP&display=swap — 200 — 30.2 KiB — 45 ms — h2https://fonts.googleapis.com/css2?family=LINE+Seed+JP:wght@400;700;800&display=swapfonts.googleapis.com/css2?family=LI... https://fonts.googleapis.com/css2?family=LINE+Seed+JP:wght@400;700;800&display=swap — 200 — 89.0 KiB — 479 ms — h2https://static.line-scdn.net/laicon/edge/latest/laicon.min.cssstatic.line-scdn.net/laicon/edge/la... https://static.line-scdn.net/laicon/edge/latest/laicon.min.css — 200 — 6.6 KiB — 32 ms — h3https://developers.line.biz/_nuxt/entry.XU__DSq0.cssdevelopers.line.biz/_nuxt/entry.XU_... https://developers.line.biz/_nuxt/entry.XU__DSq0.css — 200 — 49.8 KiB — 1.0 s — h2https://developers.line.biz/_nuxt/BaseLayout.DryLLHoQ.cssdevelopers.line.biz/_nuxt/BaseLayou... https://developers.line.biz/_nuxt/BaseLayout.DryLLHoQ.css — 200 — 9.0 KiB — 279 ms — h2https://developers.line.biz/_nuxt/TransitionExpand.C7MR6gY2.cssdevelopers.line.biz/_nuxt/Transitio... https://developers.line.biz/_nuxt/TransitionExpand.C7MR6gY2.css — 200 — 702 B — 288 ms — h2https://developers.line.biz/_nuxt/index.BInUqC-a.cssdevelopers.line.biz/_nuxt/index.BIn... https://developers.line.biz/_nuxt/index.BInUqC-a.css — 200 — 2.1 KiB — 530 ms — h2https://developers.line.biz/_nuxt/NewBadge.SwHpl8c9.cssdevelopers.line.biz/_nuxt/NewBadge.... https://developers.line.biz/_nuxt/NewBadge.SwHpl8c9.css — 200 — 674 B — 282 ms — h2https://developers.line.biz/_payload.json?3b70f8fe-6107-40ef-8d36-db6b89f9c108developers.line.biz/_payload.json?3... https://developers.line.biz/_payload.json?3b70f8fe-6107-40ef-8d36-db6b89f9c108 — 200 — 737 B — 279 ms — h2https://developers.line.biz/_nuxt/prkPQDO6.jsdevelopers.line.biz/_nuxt/prkPQDO6.... https://developers.line.biz/_nuxt/prkPQDO6.js — 200 — 420.0 KiB — 1.3 s — h2https://developers.line.biz/_nuxt/Bgms0fH8.jsdevelopers.line.biz/_nuxt/Bgms0fH8.... https://developers.line.biz/_nuxt/Bgms0fH8.js — 200 — 1.0 KiB — 282 ms — h2https://developers.line.biz/_nuxt/CrbTXa04.jsdevelopers.line.biz/_nuxt/CrbTXa04.... https://developers.line.biz/_nuxt/CrbTXa04.js — 200 — 47.1 KiB — 778 ms — h2https://developers.line.biz/_nuxt/DlAUqK2U.jsdevelopers.line.biz/_nuxt/DlAUqK2U.... https://developers.line.biz/_nuxt/DlAUqK2U.js — 200 — 717 B — 774 ms — h2https://developers.line.biz/_nuxt/C-4GxZT9.jsdevelopers.line.biz/_nuxt/C-4GxZT9.... https://developers.line.biz/_nuxt/C-4GxZT9.js — 200 — 4.2 KiB — 1.0 s — h2https://developers.line.biz/_nuxt/szH1qBxF.jsdevelopers.line.biz/_nuxt/szH1qBxF.... https://developers.line.biz/_nuxt/szH1qBxF.js — 200 — 13.3 KiB — 771 ms — h2https://developers.line.biz/_nuxt/DPxYUU_D.jsdevelopers.line.biz/_nuxt/DPxYUU_D.... https://developers.line.biz/_nuxt/DPxYUU_D.js — 200 — 742 B — 773 ms — h2https://developers.line.biz/_nuxt/DYgwRWPV.jsdevelopers.line.biz/_nuxt/DYgwRWPV.... https://developers.line.biz/_nuxt/DYgwRWPV.js — 200 — 2.0 KiB — 1.1 s — h2https://developers.line.biz/_nuxt/PUSqk0tl.jsdevelopers.line.biz/_nuxt/PUSqk0tl.... https://developers.line.biz/_nuxt/PUSqk0tl.js — 200 — 1.2 KiB — 767 ms — h2https://developers.line.biz/_nuxt/BFu_P-Ux.jsdevelopers.line.biz/_nuxt/BFu_P-Ux.... https://developers.line.biz/_nuxt/BFu_P-Ux.js — 200 — 683 B — 773 ms — h2https://developers.line.biz/_nuxt/B5eCqZVY.jsdevelopers.line.biz/_nuxt/B5eCqZVY.... https://developers.line.biz/_nuxt/B5eCqZVY.js — 200 — 8.2 KiB — 1.1 s — h2https://developers.line.biz/_nuxt/CLNKnlQW.jsdevelopers.line.biz/_nuxt/CLNKnlQW.... https://developers.line.biz/_nuxt/CLNKnlQW.js — 200 — 1.6 KiB — 1.0 s — h2https://developers.line.biz/_nuxt/BYT-zroz.jsdevelopers.line.biz/_nuxt/BYT-zroz.... https://developers.line.biz/_nuxt/BYT-zroz.js — 200 — 5.6 KiB — 1.0 s — h2https://developers.line.biz/_nuxt/BKXe4xp_.jsdevelopers.line.biz/_nuxt/BKXe4xp_.... https://developers.line.biz/_nuxt/BKXe4xp_.js — 200 — 719 B — 1.1 s — h2https://developers.line.biz/_nuxt/ClvyDXd8.jsdevelopers.line.biz/_nuxt/ClvyDXd8.... https://developers.line.biz/_nuxt/ClvyDXd8.js — 200 — 1.0 KiB — 1.0 s — h2https://developers.line.biz/_nuxt/BheWnx7M.jsdevelopers.line.biz/_nuxt/BheWnx7M.... https://developers.line.biz/_nuxt/BheWnx7M.js — 200 — 870 B — 1.0 s — h2https://developers.line.biz/_nuxt/BDornkwx.jsdevelopers.line.biz/_nuxt/BDornkwx.... https://developers.line.biz/_nuxt/BDornkwx.js — 200 — 2.6 KiB — 1.1 s — h2https://developers.line.biz/_nuxt/BYPZXu6Y.jsdevelopers.line.biz/_nuxt/BYPZXu6Y.... https://developers.line.biz/_nuxt/BYPZXu6Y.js — 200 — 2.0 KiB — 1.0 s — h2https://developers.line.biz/_nuxt/BffxFq_0.jsdevelopers.line.biz/_nuxt/BffxFq_0.... https://developers.line.biz/_nuxt/BffxFq_0.js — 200 — 750 B — 1.0 s — h2
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 4.9 s LCP 8.1 shttps://social-plugins.line.me// https://social-plugins.line.me/ — 301 — 329 B — 259 ms — http/1.1https://developers.line.biz/?r=/docs/line-social-plugins/developers.line.biz/?r=/docs/line-s... https://developers.line.biz/?r=/docs/line-social-plugins/ — 200 — 10.9 KiB — 1.0 s — h2https://fonts.googleapis.com/css2?family=Noto+Sans+JP&display=swapfonts.googleapis.com/css2?family=No... https://fonts.googleapis.com/css2?family=Noto+Sans+JP&display=swap — 200 — 30.2 KiB — 45 ms — h2https://fonts.googleapis.com/css2?family=LINE+Seed+JP:wght@400;700;800&display=swapfonts.googleapis.com/css2?family=LI... https://fonts.googleapis.com/css2?family=LINE+Seed+JP:wght@400;700;800&display=swap — 200 — 89.0 KiB — 479 ms — h2https://static.line-scdn.net/laicon/edge/latest/laicon.min.cssstatic.line-scdn.net/laicon/edge/la... https://static.line-scdn.net/laicon/edge/latest/laicon.min.css — 200 — 6.6 KiB — 32 ms — h3https://developers.line.biz/_nuxt/entry.XU__DSq0.cssdevelopers.line.biz/_nuxt/entry.XU_... https://developers.line.biz/_nuxt/entry.XU__DSq0.css — 200 — 49.8 KiB — 1.0 s — h2https://developers.line.biz/_nuxt/BaseLayout.DryLLHoQ.cssdevelopers.line.biz/_nuxt/BaseLayou... https://developers.line.biz/_nuxt/BaseLayout.DryLLHoQ.css — 200 — 9.0 KiB — 279 ms — h2https://developers.line.biz/_nuxt/TransitionExpand.C7MR6gY2.cssdevelopers.line.biz/_nuxt/Transitio... https://developers.line.biz/_nuxt/TransitionExpand.C7MR6gY2.css — 200 — 702 B — 288 ms — h2https://developers.line.biz/_nuxt/index.BInUqC-a.cssdevelopers.line.biz/_nuxt/index.BIn... https://developers.line.biz/_nuxt/index.BInUqC-a.css — 200 — 2.1 KiB — 530 ms — h2https://developers.line.biz/_nuxt/NewBadge.SwHpl8c9.cssdevelopers.line.biz/_nuxt/NewBadge.... https://developers.line.biz/_nuxt/NewBadge.SwHpl8c9.css — 200 — 674 B — 282 ms — h2https://developers.line.biz/_payload.json?3b70f8fe-6107-40ef-8d36-db6b89f9c108developers.line.biz/_payload.json?3... https://developers.line.biz/_payload.json?3b70f8fe-6107-40ef-8d36-db6b89f9c108 — 200 — 737 B — 279 ms — h2https://developers.line.biz/_nuxt/prkPQDO6.jsdevelopers.line.biz/_nuxt/prkPQDO6.... https://developers.line.biz/_nuxt/prkPQDO6.js — 200 — 420.0 KiB — 1.3 s — h2https://developers.line.biz/_nuxt/Bgms0fH8.jsdevelopers.line.biz/_nuxt/Bgms0fH8.... https://developers.line.biz/_nuxt/Bgms0fH8.js — 200 — 1.0 KiB — 282 ms — h2https://developers.line.biz/_nuxt/CrbTXa04.jsdevelopers.line.biz/_nuxt/CrbTXa04.... https://developers.line.biz/_nuxt/CrbTXa04.js — 200 — 47.1 KiB — 778 ms — h2https://developers.line.biz/_nuxt/DlAUqK2U.jsdevelopers.line.biz/_nuxt/DlAUqK2U.... https://developers.line.biz/_nuxt/DlAUqK2U.js — 200 — 717 B — 774 ms — h2https://developers.line.biz/_nuxt/C-4GxZT9.jsdevelopers.line.biz/_nuxt/C-4GxZT9.... https://developers.line.biz/_nuxt/C-4GxZT9.js — 200 — 4.2 KiB — 1.0 s — h2https://developers.line.biz/_nuxt/szH1qBxF.jsdevelopers.line.biz/_nuxt/szH1qBxF.... https://developers.line.biz/_nuxt/szH1qBxF.js — 200 — 13.3 KiB — 771 ms — h2https://developers.line.biz/_nuxt/DPxYUU_D.jsdevelopers.line.biz/_nuxt/DPxYUU_D.... https://developers.line.biz/_nuxt/DPxYUU_D.js — 200 — 742 B — 773 ms — h2https://developers.line.biz/_nuxt/DYgwRWPV.jsdevelopers.line.biz/_nuxt/DYgwRWPV.... https://developers.line.biz/_nuxt/DYgwRWPV.js — 200 — 2.0 KiB — 1.1 s — h2https://developers.line.biz/_nuxt/PUSqk0tl.jsdevelopers.line.biz/_nuxt/PUSqk0tl.... https://developers.line.biz/_nuxt/PUSqk0tl.js — 200 — 1.2 KiB — 767 ms — h2https://developers.line.biz/_nuxt/BFu_P-Ux.jsdevelopers.line.biz/_nuxt/BFu_P-Ux.... https://developers.line.biz/_nuxt/BFu_P-Ux.js — 200 — 683 B — 773 ms — h2https://developers.line.biz/_nuxt/B5eCqZVY.jsdevelopers.line.biz/_nuxt/B5eCqZVY.... https://developers.line.biz/_nuxt/B5eCqZVY.js — 200 — 8.2 KiB — 1.1 s — 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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
100% of JavaScript execution is third-party
First-party Third-party 16916ms · 687KB · ¥23374/mo
Unattributable
Other
Costly
Execution 12993ms
Transfer 0 KB
Monthly Cost ¥17954/mo
developers.line.biz
Other
Costly
Execution 2076ms
Transfer 11 KB
Monthly Cost ¥2869/mo
developers.line.biz
Other
Costly
Execution 656ms
Transfer 2 KB
Monthly Cost ¥906/mo
Google Tag Manager
Tag Manager
Costly
Execution 557ms
Transfer 157 KB
Unused 41%
Monthly Cost ¥770/mo
developers.line.biz
Other
Costly
Execution 530ms
Transfer 47 KB
Unused 50%
Monthly Cost ¥732/mo
developers.line.biz
Other
Costly
Execution 52ms
Transfer 420 KB
Unused 10%
Monthly Cost ¥72/mo
developers.line.biz
Other
Costly
Execution 51ms
Transfer 50 KB
Monthly Cost ¥71/mo

These scripts may cost more than they're worth

  • Unattributable adds 12993ms and costs ~¥17954/month
  • developers.line.biz adds 2076ms and costs ~¥2869/month
  • developers.line.biz adds 656ms and costs ~¥906/month
  • Google Tag Manager adds 557ms and costs ~¥770/month
  • developers.line.biz adds 530ms and costs ~¥732/month
  • developers.line.biz adds 52ms and costs ~¥72/month
  • developers.line.biz adds 51ms and costs ~¥71/month

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

Unattributable takes 12993ms 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

developers.line.biz takes 2076ms 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

developers.line.biz takes 656ms 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 557ms 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

developers.line.biz takes 530ms 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

developers.line.biz takes 52ms 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

developers.line.biz takes 51ms 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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