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https://japan-guide.com

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
3
REVIEW
5
PASS
7
INFO
2

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

Mobile Desktop
45
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
79
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.
92
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.

4.52 s

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

9.63 s

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

634 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.

5.95 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.

10.24 s

Page Load Progression

413 ms
827 ms
1.2 s
1.7 s
2.1 s
2.5 s
2.9 s
3.3 s
Checks
17
7 PASS 5 REVIEW 3 FIX
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 (1.7 MiB of 1.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
4262ms total JS execution
FIX
4262ms total JS execution
Warning::
https://www.japan-guide.com/public/js/jg/main.008c...: 1490ms CPU time
Warning::
https://www.japan-guide.com/: 952ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-NVWP...: 843ms CPU time
Warning::
Unattributable: 496ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=UA-350...: 160ms CPU time
Warning::
Third-party scripts: 4262ms (100% of total)

Main Thread Breakdown

Script Evaluation 32% Other 25% Style & Layout 22% Rendering 10% Script Parsing & Compilation 7% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.japan-guide.com/public/js/jg/main.008c46eb48a1209d29ef7380c0bceafd.min.js1490ms649ms61ms3rd
https://www.japan-guide.com/952ms14ms4ms3rd
https://www.googletagmanager.com/gtag/js?id=G-NVWP7LRL3Y843ms301ms65ms3rd
Unattributable496ms71ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=UA-3501429-1160ms109ms49ms3rd
https://static.sojern.com/sdk/latest/sojern.min.js122ms83ms38ms3rd
https://www.google-analytics.com/analytics.js69ms42ms18ms3rd
https://www.googletagmanager.com/gtag/js?id=UA-3501429-1&cx=c&gtm=4e64k168ms24ms44ms3rd
https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js61ms45ms12ms3rd
D
Page Weight Inventory
Action
63 resources · 1.7 MB · 218 KB savings available
FIX
63 resources · 1.7 MB · 218 KB savings available
Warning::
Page weight 683 KB over 1MB target
Got: 1.7 MB Expected: ≤ 1 MB
Info::
~218 KB of savings available
Warning::
62 third-party resources (100% of weight)
Info::
1 resources over 200KB
63 resources · 1.7 MiB · 62 third-party 683.0 KiB over 1MB target
Image 50% · 846.2 KiB
JavaScript 32% · 549.0 KiB
Font 12% · 200.2 KiB
CSS 3% · 58.7 KiB
Document 3% · 49.6 KiB
Other 0% · 3.3 KiB

~218.3 KiB of savings available

Remove unused JavaScript: 218.3 KiB
C
Page Weight Budget
Action
1.7 MB transferred, 63 requests
REVIEW
1.7 MB transferred, 63 requests
Info::
Page weighs 3.3 MB (1.7 MB transferred)
Warning::
JavaScript is 520 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 520 KB
Info::
Fonts are 200 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 200 KB
Info::
63 HTTP requests
Info::
Estimated 0.35 g CO2 per page load
1.7 MB / 2.4 MB budget
1.7 MB transferred
63 requests
0.35 g CO2 per page load
Images 748.2 KiB 44%
JavaScript 520.1 KiB 30%
Fonts 200.2 KiB 12%
Other 99.0 KiB 6%
CSS 53.0 KiB 3%
HTML 45.3 KiB 3%
Other 38.3 KiB 2%
Other 2.9 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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

B
Image Optimization
10 images, 0 KB saveable
REVIEW
10 images, 0 KB saveable
Info::
All images are well-optimized
10 images 748 KB
0 oversized -0 KB
9 legacy format
0 missing dimensions CLS risk
C
JS Bundles
Action
17 scripts, 218 KB unused
REVIEW
17 scripts, 218 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=UA-350...: 90 KB unused (78%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=UA-350...: 65 KB unused (57%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-NVWP...: 63 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 218 KB
218 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=UA-3501429-1&cx=c&gtm=4e64k1116 KB90 KB (78%)✓3rd
https://www.googletagmanager.com/gtag/js?id=UA-3501429-1115 KB65 KB (57%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-NVWP7LRL3Y151 KB63 KB (42%)✓3rd
https://static.sojern.com/sdk/latest/sojern.min.js44 KB—✓3rd
https://www.japan-guide.com/public/js/jg/pages/homepage_seasonal_teaser.451cd3ede656b7c9d0f8792a9bfc356d.min.js1 KB—✓3rd
https://js.adara.com/index.js7 KB—✓3rd
https://www.japan-guide.com/public/js/jg/main.008c46eb48a1209d29ef7380c0bceafd.min.js33 KB—✓3rd
https://www.japan-guide.com/public/js/jg/pages/homepage.59c9f928a34542e7a6860c81333ab68e.min.js0 KB—✓3rd
https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js30 KB—✓3rd
https://www.japan-guide.com/public/js/jg/components/feature_map.1c4c4ae1e49a054481aa93db30323e3d.min.js1 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

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

Green Hosting

No green hosting detected

B
HTTP Caching
max-age=0
REVIEW
max-age=0
Info::
Cache-Control header is set
Got: max-age=0
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=0

DirectiveValueMeaning
max-age0Cache for 0 seconds
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
3 fonts (200 KB)
PASS
3 fonts (200 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

200 KB total

Render-blocking

0

of 3

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 4.5 s LCP 9.6 shttps://www.japan-guide.com/public/fonts/baltoweb-book.woffbaltoweb-book.woff https://www.japan-guide.com/public/fonts/baltoweb-book.woff — 66.4 KiB — 635 ms — font-display: swaphttps://www.japan-guide.com/public/fonts/baltoweb-medium.woffbaltoweb-medium.woff https://www.japan-guide.com/public/fonts/baltoweb-medium.woff — 63.1 KiB — 840 ms — font-display: swaphttps://www.japan-guide.com/public/fonts/baltoweb-bold.woffbaltoweb-bold.woff https://www.japan-guide.com/public/fonts/baltoweb-bold.woff — 70.7 KiB — 845 ms — font-display: swap
baltoweb-book.woff woff swap
Size 66 KB
Load time 635 ms
Start 965 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
baltoweb-medium.woff woff swap
Size 63 KB
Load time 840 ms
Start 966 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
baltoweb-bold.woff woff swap
Size 71 KB
Load time 845 ms
Start 966 ms
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 ~60 KB and ~120 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
6 hints, 0 missing preconnects
PASS
6 hints, 0 missing preconnects
Info::
Page uses 6 resource hint(s)

Current Resource Hints

preconnect
1
preload
4
dns-prefetch
1
prefetch
—

6 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
63 requests over 4223ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 4.5 s LCP 9.6 shttps://japan-guide.com// https://japan-guide.com/ — 301 — 217 B — 686 ms — h2https://www.japan-guide.com/www.japan-guide.com/ https://www.japan-guide.com/ — 200 — 45.3 KiB — 687 ms — h2https://www.googletagmanager.com/gtag/js?id=UA-3501429-1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=UA-3501429-1 — 200 — 115.1 KiB — 48 ms — h2https://www.googletagmanager.com/gtag/js?id=G-NVWP7LRL3Ywww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-NVWP7LRL3Y — 200 — 150.8 KiB — 37 ms — h2https://www.japan-guide.com/public/fonts/baltoweb-book.woffwww.japan-guide.com/public/fonts/ba... https://www.japan-guide.com/public/fonts/baltoweb-book.woff — 200 — 66.4 KiB — 635 ms — h2https://www.japan-guide.com/public/fonts/baltoweb-medium.woffwww.japan-guide.com/public/fonts/ba... https://www.japan-guide.com/public/fonts/baltoweb-medium.woff — 200 — 63.1 KiB — 840 ms — h2https://www.japan-guide.com/public/fonts/baltoweb-bold.woffwww.japan-guide.com/public/fonts/ba... https://www.japan-guide.com/public/fonts/baltoweb-bold.woff — 200 — 70.7 KiB — 845 ms — h2https://www.japan-guide.com/public/css/jg/main.0df7634762c5acfbaea55e8a42fe705b.min.csswww.japan-guide.com/public/css/jg/m... https://www.japan-guide.com/public/css/jg/main.0df7634762c5acfbaea55e8a42fe705b.min.css — 200 — 43.8 KiB — 634 ms — h2https://www.japan-guide.com/public/css/jg/pages/homepage.e96c72a89bce0f6a473099238faf40fe.min.csswww.japan-guide.com/public/css/jg/p... https://www.japan-guide.com/public/css/jg/pages/homepage.e96c72a89bce0f6a473099238faf40fe.min.css — 200 — 3.4 KiB — 631 ms — h2https://www.japan-guide.com/public/css/jg/components/feature_map.f18d70d981c4fdb9de3d3bab13233839.min.csswww.japan-guide.com/public/css/jg/c... https://www.japan-guide.com/public/css/jg/components/feature_map.f18d70d981c4fdb9de3d3bab13233839.min.css — 200 — 2.2 KiB — 631 ms — h2https://www.japan-guide.com/public/css/jg/pages/homepage_seasonal_teaser.a56dc1887a99dd505bb7c5c7175444bc.min.csswww.japan-guide.com/public/css/jg/p... https://www.japan-guide.com/public/css/jg/pages/homepage_seasonal_teaser.a56dc1887a99dd505bb7c5c7175444bc.min.css — 200 — 2.1 KiB — 631 ms — h2https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.jsajax.googleapis.com/ajax/libs/jquer... https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js — 200 — 30.3 KiB — 20 ms — h2https://www.googletagmanager.com/gtag/js?id=UA-3501429-1&cx=c&gtm=4e64k1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=UA-3501429-1&cx=c&gtm=4e64k1 — 200 — 115.5 KiB — 16 ms — h2https://www.google-analytics.com/g/collect?v=2&tid=G-NVWP7LRL3Y&gtm=45je64k1v883266631za200zd883266631&_p=1776900840187&gcd=13l3l3l3l1l1&npa=0&dma=0&are=1&cid=1622949274.1776900840&frm=0&pscdl=noapi&rcb=12&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115616985~115938466~115938468~117266401~117512543~118463261&sid=1776900840&sct=1&seg=0&dl=https%3A%2F%2Fwww.japan-guide.com%2F&dt=japan-guide.com%20-%20Japan%20Travel%20and%20Living%20Guide&en=page_view&_fv=1&_nsi=1&_ss=1&_ee=1&tfd=1110www.google-analytics.com/g/collect?... https://www.google-analytics.com/g/collect?v=2&tid=G-NVWP7LRL3Y&gtm=45je64k1v883266631za200zd883266631&_p=1776900840187&gcd=13l3l3l3l1l1&npa=0&dma=0&are=1&cid=1622949274.1776900840&frm=0&pscdl=noapi&rcb=12&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115616985~115938466~115938468~117266401~117512543~118463261&sid=1776900840&sct=1&seg=0&dl=https%3A%2F%2Fwww.japan-guide.com%2F&dt=japan-guide.com%20-%20Japan%20Travel%20and%20Living%20Guide&en=page_view&_fv=1&_nsi=1&_ss=1&_ee=1&tfd=1110 — 204 — 552 B — 28 ms — h2https://www.google-analytics.com/analytics.jswww.google-analytics.com/analytics.... https://www.google-analytics.com/analytics.js — 200 — 20.8 KiB — 6 ms — h2https://js.adara.com/index.jsjs.adara.com/index.js https://js.adara.com/index.js — 200 — 6.6 KiB — 15 ms — h2https://www.japan-guide.com/ad/banner/insidejapan_2603_b.jpgwww.japan-guide.com/ad/banner/insid... https://www.japan-guide.com/ad/banner/insidejapan_2603_b.jpg — 200 — 26.3 KiB — 236 ms — h2https://www.japan-guide.com/blog/g/sakura26_260422_hakodate_feature.jpgwww.japan-guide.com/blog/g/sakura26... https://www.japan-guide.com/blog/g/sakura26_260422_hakodate_feature.jpg — 200 — 250.7 KiB — 429 ms — h2https://www.japan-guide.com/public/js/jg/main.008c46eb48a1209d29ef7380c0bceafd.min.jswww.japan-guide.com/public/js/jg/ma... https://www.japan-guide.com/public/js/jg/main.008c46eb48a1209d29ef7380c0bceafd.min.js — 200 — 33.4 KiB — 436 ms — h2https://www.japan-guide.com/public/js/jg/pages/homepage.59c9f928a34542e7a6860c81333ab68e.min.jswww.japan-guide.com/public/js/jg/pa... https://www.japan-guide.com/public/js/jg/pages/homepage.59c9f928a34542e7a6860c81333ab68e.min.js — 200 — 477 B — 429 ms — h2data:image/svg+xml;utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='32px' height='32px' viewBo…www.w3.org/2000/svg' width='32px' h... data:image/svg+xml;utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='32px' height='32px' viewBo… — 200 — 0 B — 0 ms — datadata:image/svg+xml;utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='32px' height='32px' viewBo…www.w3.org/2000/svg' width='32px' h... data:image/svg+xml;utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='32px' height='32px' viewBo… — 200 — 0 B — 0 ms — datadata:image/svg+xml;utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='32px' height='32px' viewBo…www.w3.org/2000/svg' width='32px' h... data:image/svg+xml;utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='32px' height='32px' viewBo… — 200 — 0 B — 0 ms — datadata:image/svg+xml;utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='32px' height='32px' viewBo…www.w3.org/2000/svg' width='32px' h... data:image/svg+xml;utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='32px' height='32px' viewBo… — 200 — 0 B — 0 ms — datahttps://static.sojern.com/sdk/latest/sojern.min.jsstatic.sojern.com/sdk/latest/sojern... https://static.sojern.com/sdk/latest/sojern.min.js — 200 — 44.5 KiB — 19 ms — h2https://jsres.adara.com/tcf/ro.jsonjsres.adara.com/tcf/ro.json https://jsres.adara.com/tcf/ro.json — 200 — 668 B — 16 ms — h2https://sdk.adara.com/api?gdpr=&gdpr_consent=sdk.adara.com/api?gdpr=&gdpr_consen... https://sdk.adara.com/api?gdpr=&gdpr_consent= — 200 — 0 B — 19 ms — h2https://sdk.adara.com/api?gdpr=&gdpr_consent=sdk.adara.com/api?gdpr=&gdpr_consen... https://sdk.adara.com/api?gdpr=&gdpr_consent= — 200 — 36 B — 12 ms — h3https://pixel.sojern.com/sdk/partner/id/QhyvQoXvMDXcOyLN/configpixel.sojern.com/sdk/partner/id/Qhy... https://pixel.sojern.com/sdk/partner/id/QhyvQoXvMDXcOyLN/config — 307 — 364 B — 29 ms — h2https://tag.yieldoptimizer.com/ps/ps?t=i&p=2452&_yoid=b0368cc8-e716-4a1a-bb62-91981e40fd7a&_yosid=7027bd07-be00-4999-8b2a-784211d2e9ba&gdpr=&gdpr_consent=tag.yieldoptimizer.com/ps/ps?t=i&p=... https://tag.yieldoptimizer.com/ps/ps?t=i&p=2452&_yoid=b0368cc8-e716-4a1a-bb62-91981e40fd7a&_yosid=7027bd07-be00-4999-8b2a-784211d2e9ba&gdpr=&gdpr_consent= — 302 — 1.0 KiB — 26 ms — h2
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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
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INFO
100% of JavaScript execution is third-party
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Other
Costly
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Transfer 33 KB
Monthly Cost $20/mo
www.japan-guide.com
Other
Costly
Execution 952ms
Transfer 45 KB
Monthly Cost $13/mo
Google Tag Manager
Tag Manager
Costly
Execution 843ms
Transfer 151 KB
Unused 42%
Monthly Cost $11/mo
Unattributable
Other
Costly
Execution 496ms
Transfer 0 KB
Monthly Cost $7/mo
Google Tag Manager
Tag Manager
Optional
Execution 160ms
Transfer 115 KB
Unused 57%
Monthly Cost $2/mo
static.sojern.com
Other
Optional
Execution 122ms
Transfer 44 KB
Monthly Cost $2/mo
Google Analytics
Analytics
Optional
Execution 69ms
Transfer 21 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 68ms
Transfer 116 KB
Unused 78%
Monthly Cost $1/mo
ajax.googleapis.com
Other
Optional
Execution 61ms
Transfer 30 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.japan-guide.com adds 1490ms and costs ~$20/month
  • www.japan-guide.com adds 952ms and costs ~$13/month
  • Google Tag Manager adds 843ms and costs ~$11/month
  • Unattributable adds 496ms and costs ~$7/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

www.japan-guide.com takes 1490ms 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

www.japan-guide.com takes 952ms 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 843ms 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 496ms 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

57% 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

78% 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

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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