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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
83
GRADE
B
FIX
4
REVIEW
4
PASS
5
INFO
2

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

Mobile Desktop
86
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
95
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.
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.

1.20 s

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

2.10 s

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

6 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.

1.33 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.

2.78 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
5 PASS 4 REVIEW 4 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 (1.6 MiB of 1.6 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
48 scripts, 398 KB unused
FIX
48 scripts, 398 KB unused
Warning::
https://www.gstatic.com/devrel-devsite/prod/v57907...: 164 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-KFP...: 85 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-64EQ...: 62 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-NDV...: 61 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/devrel-devsite/prod/v57907...: 27 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 398 KB
398 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.gstatic.com/devrel-devsite/prod/v579073a50c63499824df5a68b8922367066583d283ef78fdade1028efdb4ceb5/firebase/js/devsite_app_custom_elements_module.js303 KB164 KB (54%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KFPLMHC156 KB85 KB (54%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-64EQFFKSHW&l=atDataLayer&cx=c&gtm=4e64h1143 KB62 KB (43%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NDV7K7V5&l=atDataLayer132 KB61 KB (46%)✓3rd
https://www.gstatic.com/devrel-devsite/prod/v579073a50c63499824df5a68b8922367066583d283ef78fdade1028efdb4ceb5/firebase/js/devsite_app_module.js58 KB27 KB (47%)✓3rd
https://www.gstatic.com/devrel-devsite/prod/v579073a50c63499824df5a68b8922367066583d283ef78fdade1028efdb4ceb5/firebase/js/devsite_devsite_notification_module.js0 KB—✓3rd
https://www.gstatic.com/devrel-devsite/prod/v579073a50c63499824df5a68b8922367066583d283ef78fdade1028efdb4ceb5/firebase/js/devsite_devsite_recommendations_sidebar_module.js2 KB—✓3rd
https://www.gstatic.com/devrel-devsite/prod/v579073a50c63499824df5a68b8922367066583d283ef78fdade1028efdb4ceb5/firebase/js/devsite_devsite_actions_module.js0 KB—✓3rd
https://www.gstatic.com/devrel-devsite/prod/v579073a50c63499824df5a68b8922367066583d283ef78fdade1028efdb4ceb5/firebase/js/devsite_devsite_analytics_module.js0 KB—✓3rd
https://www.gstatic.com/devrel-devsite/prod/v579073a50c63499824df5a68b8922367066583d283ef78fdade1028efdb4ceb5/firebase/js/devsite_devsite_appearance_selector_module.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

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

D
Page Weight Inventory
Action
81 resources · 1.6 MB · 398 KB savings available
FIX
81 resources · 1.6 MB · 398 KB savings available
Warning::
Page weight 621 KB over 1MB target
Got: 1.6 MB Expected: ≤ 1 MB
Info::
~398 KB of savings available
Warning::
80 third-party resources (100% of weight)
Info::
1 resources over 200KB
81 resources · 1.6 MiB · 80 third-party 620.7 KiB over 1MB target
JavaScript 53% · 869.0 KiB
Image 17% · 286.9 KiB
Font 14% · 232.5 KiB
CSS 10% · 167.3 KiB
Document 5% · 86.6 KiB
Other 0% · 2.4 KiB

~398.1 KiB of savings available

Remove unused JavaScript: 398.1 KiB
F
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.

No Cache-Control header

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

C
Page Weight Budget
Action
1.6 MB transferred, 81 requests
REVIEW
1.6 MB transferred, 81 requests
Info::
Page weighs 5.1 MB (1.6 MB transferred)
Warning::
JavaScript is 869 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 869 KB
Info::
Fonts are 233 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 233 KB
Info::
81 HTTP requests
Info::
Estimated 0.34 g CO2 per page load
1.6 MB / 2.4 MB budget
1.6 MB transferred
81 requests
0.34 g CO2 per page load
JavaScript 869.0 KiB 53%
Images 286.9 KiB 17%
Fonts 232.5 KiB 14%
CSS 167.3 KiB 10%
HTML 86.6 KiB 5%
Other 1.2 KiB 0%
Other 1013 B 0%
Other 271 B 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

C
Image Optimization
Action
9 images, 0 KB saveable
REVIEW
9 images, 0 KB saveable
Warning::
https://firebase.google.com/static/images/products... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://firebase.google.com/static/images/products... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://firebase.google.com/static/images/products... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://firebase.google.com/static/images/products... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://firebase.google.com/static/images/products... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
9 images 283 KB
0 oversized -0 KB
8 legacy format
5 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

B
JS Execution Cost
835ms total JS execution
REVIEW
835ms total JS execution
Warning::
https://firebase.google.com/products/hosting/: 270ms CPU time
Info::
Unattributable: 175ms CPU time
Info::
https://www.gstatic.com/devrel-devsite/prod/v57907...: 96ms CPU time
Info::
https://www.gstatic.com/devrel-devsite/prod/v57907...: 82ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-KFP...: 82ms CPU time
Warning::
Third-party scripts: 835ms (100% of total)

Main Thread Breakdown

Script Evaluation 42% Other 26% Style & Layout 18% Script Parsing & Compilation 7% Parse HTML & CSS 3% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://firebase.google.com/products/hosting/270ms6ms1ms3rd
Unattributable175ms23ms0ms3rd
https://www.gstatic.com/devrel-devsite/prod/v579073a50c63499824df5a68b8922367066583d283ef78fdade1028efdb4ceb5/firebase/js/devsite_app_custom_elements_module.js96ms60ms24ms3rd
https://www.gstatic.com/devrel-devsite/prod/v579073a50c63499824df5a68b8922367066583d283ef78fdade1028efdb4ceb5/firebase/js/devsite_app_module.js82ms59ms4ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KFPLMHC82ms68ms12ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NDV7K7V5&l=atDataLayer69ms58ms10ms3rd
https://www.googletagmanager.com/gtag/js?id=G-64EQFFKSHW&l=atDataLayer&cx=c&gtm=4e64h161ms52ms9ms3rd
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 (233 KB)
PASS
5 fonts (233 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

233 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 500 ms 1.0 s 1.5 s 2.0 s FCP 1.2 s LCP 2.1 shttps://fonts.gstatic.com/s/googlesans/v67/4UasrENHsxJlGDuGo1OIlJfC6l_24rlCK1Yo_Iqcsih3SAyH6cAwhX9RPjIUvbQoi-E.woff24UasrENHsxJlGDuGo1OIlJf... https://fonts.gstatic.com/s/googlesans/v67/4UasrENHsxJlGDuGo1OIlJfC6l_24rlCK1Yo_Iqcsih3SAyH6cAwhX9RPjIUvbQoi-E.woff2 — 35.3 KiB — 74 ms — font-display: swaphttps://fonts.gstatic.com/s/materialicons/v145/flUhRq6tzZclQEJ-Vdg-IuiaDsNcIhQ8tQ.woff2flUhRq6tzZclQEJ-Vdg-Iui... https://fonts.gstatic.com/s/materialicons/v145/flUhRq6tzZclQEJ-Vdg-IuiaDsNcIhQ8tQ.woff2 — 125.6 KiB — 93 ms — font-display: swaphttps://fonts.gstatic.com/s/robotomono/v31/L0x5DF4xlVMF-BfR8bXMIjhLq3-cXbKD.woff2L0x5DF4xlVMF-BfR8bXMIjh... https://fonts.gstatic.com/s/robotomono/v31/L0x5DF4xlVMF-BfR8bXMIjhLq3-cXbKD.woff2 — 32.0 KiB — 69 ms — font-display: swaphttps://fonts.gstatic.com/s/jetbrainsmono/v24/tDbV2o-flEEny0FZhsfKu5WU4xD7OwGtT0rU.woff2tDbV2o-flEEny0FZhsfKu5W... https://fonts.gstatic.com/s/jetbrainsmono/v24/tDbV2o-flEEny0FZhsfKu5WU4xD7OwGtT0rU.woff2 — 39.6 KiB — 72 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 0 B — 41 ms — font-display: swap
4UasrENHsxJlGDuGo1OIlJf... woff2 swap
Size 35 KB
Load time 74 ms
Start 578 ms
Risk FOUT — text flashes from fallback to web font
flUhRq6tzZclQEJ-Vdg-Iui... woff2 swap
Size 126 KB
Load time 93 ms
Start 579 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
L0x5DF4xlVMF-BfR8bXMIjh... woff2 swap
Size 32 KB
Load time 69 ms
Start 579 ms
Risk FOUT — text flashes from fallback to web font
tDbV2o-flEEny0FZhsfKu5W... woff2 swap
Size 40 KB
Load time 72 ms
Start 580 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 0 KB
Load time 41 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)

Fixing the unchecked items could save ~63 KB and ~126 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
81 requests over 3832ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 1.2 s LCP 2.1 shttps://web.app// https://web.app/ — 301 — 271 B — 5 ms — h2https://firebase.google.com/products/hosting/firebase.google.com/products/hostin... https://firebase.google.com/products/hosting/ — 200 — 86.1 KiB — 396 ms — h2https://fonts.googleapis.com/css?family=Google+Sans:400,500|Roboto:400,400italic,500,500italic,700,700italic|Roboto+Mono:400,500,700&display=swapfonts.googleapis.com/css?family=Goo... https://fonts.googleapis.com/css?family=Google+Sans:400,500|Roboto:400,400italic,500,500italic,700,700italic|Roboto+Mono:400,500,700&display=swap — 200 — 3.6 KiB — 78 ms — h2https://fonts.googleapis.com/css2?family=Material+Icons&family=Material+Symbols+Outlined&display=blockfonts.googleapis.com/css2?family=Ma... https://fonts.googleapis.com/css2?family=Material+Icons&family=Material+Symbols+Outlined&display=block — 200 — 613 B — 80 ms — h2https://www.gstatic.com/devrel-devsite/prod/v579073a50c63499824df5a68b8922367066583d283ef78fdade1028efdb4ceb5/firebase/css/app.csswww.gstatic.com/devrel-devsite/prod... https://www.gstatic.com/devrel-devsite/prod/v579073a50c63499824df5a68b8922367066583d283ef78fdade1028efdb4ceb5/firebase/css/app.css — 200 — 154.6 KiB — 143 ms — h2https://www.gstatic.com/devrel-devsite/prod/v579073a50c63499824df5a68b8922367066583d283ef78fdade1028efdb4ceb5/firebase/css/dark-theme.csswww.gstatic.com/devrel-devsite/prod... https://www.gstatic.com/devrel-devsite/prod/v579073a50c63499824df5a68b8922367066583d283ef78fdade1028efdb4ceb5/firebase/css/dark-theme.css — 200 — 5.3 KiB — 135 ms — h2https://fonts.googleapis.com/css2?family=JetBrains+Mono:ital,wght@0,100..800;1,100..800&display=swapfonts.googleapis.com/css2?family=Je... https://fonts.googleapis.com/css2?family=JetBrains+Mono:ital,wght@0,100..800;1,100..800&display=swap — 200 — 776 B — 83 ms — h2https://fonts.googleapis.com/css?family=Google+Sans:400,500,600,700fonts.googleapis.com/css?family=Goo... https://fonts.googleapis.com/css?family=Google+Sans:400,500,600,700 — 200 — 2.5 KiB — 80 ms — h2https://www.gstatic.com/devrel-devsite/prod/v579073a50c63499824df5a68b8922367066583d283ef78fdade1028efdb4ceb5/firebase/images/lockup.svgwww.gstatic.com/devrel-devsite/prod... https://www.gstatic.com/devrel-devsite/prod/v579073a50c63499824df5a68b8922367066583d283ef78fdade1028efdb4ceb5/firebase/images/lockup.svg — 200 — 3.4 KiB — 141 ms — h2https://firebase.google.com/_pwa/firebase/manifest.jsonfirebase.google.com/_pwa/firebase/m... https://firebase.google.com/_pwa/firebase/manifest.json — 200 — 1.2 KiB — 31 ms — h2https://firebase.google.com/static/images/products/hosting/hosting-hero_1x.pngfirebase.google.com/static/images/p... https://firebase.google.com/static/images/products/hosting/hosting-hero_1x.png — 200 — 160.8 KiB — 434 ms — h3https://firebase.google.com/static/images/products/hosting/hosting-1.pngfirebase.google.com/static/images/p... https://firebase.google.com/static/images/products/hosting/hosting-1.png — 200 — 3.6 KiB — 219 ms — h3https://firebase.google.com/static/images/products/hosting/hosting-2.pngfirebase.google.com/static/images/p... https://firebase.google.com/static/images/products/hosting/hosting-2.png — 200 — 3.8 KiB — 465 ms — h3https://firebase.google.com/static/images/products/hosting/hosting-3.pngfirebase.google.com/static/images/p... https://firebase.google.com/static/images/products/hosting/hosting-3.png — 200 — 72.8 KiB — 307 ms — h3https://firebase.google.com/static/images/products/hosting/hosting-4.pngfirebase.google.com/static/images/p... https://firebase.google.com/static/images/products/hosting/hosting-4.png — 200 — 7.2 KiB — 245 ms — h3https://firebase.google.com/static/images/products/hosting/hosting-5.pngfirebase.google.com/static/images/p... https://firebase.google.com/static/images/products/hosting/hosting-5.png — 200 — 22.3 KiB — 287 ms — h3https://firebase.google.com/static/images/products/hosting/hosting-6.pngfirebase.google.com/static/images/p... https://firebase.google.com/static/images/products/hosting/hosting-6.png — 200 — 7.8 KiB — 253 ms — h3https://firebase.google.com/static/images/products/hosting/hosting-7.pngfirebase.google.com/static/images/p... https://firebase.google.com/static/images/products/hosting/hosting-7.png — 200 — 5.1 KiB — 227 ms — h3https://fonts.gstatic.com/s/googlesans/v67/4UasrENHsxJlGDuGo1OIlJfC6l_24rlCK1Yo_Iqcsih3SAyH6cAwhX9RPjIUvbQoi-E.woff2fonts.gstatic.com/s/googlesans/v67/... https://fonts.gstatic.com/s/googlesans/v67/4UasrENHsxJlGDuGo1OIlJfC6l_24rlCK1Yo_Iqcsih3SAyH6cAwhX9RPjIUvbQoi-E.woff2 — 200 — 35.3 KiB — 74 ms — h3https://fonts.gstatic.com/s/materialicons/v145/flUhRq6tzZclQEJ-Vdg-IuiaDsNcIhQ8tQ.woff2fonts.gstatic.com/s/materialicons/v... 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— 204 — 551 B — 77 ms — h2https://cloud.google.com/log?format=json&hasfast=true&authuser=0cloud.google.com/log?format=json&ha... https://cloud.google.com/log?format=json&hasfast=true&authuser=0 — 200 — 0 B — 71 ms — h2https://cloud.google.com/log?format=json&hasfast=true&authuser=0cloud.google.com/log?format=json&ha... https://cloud.google.com/log?format=json&hasfast=true&authuser=0 — 200 — 151 B — 80 ms — h3
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 835ms · 878KB · €2/mo
firebase.google.com
Other
Costly
Execution 270ms
Transfer 86 KB
Monthly Cost €1/mo
Unattributable
Other
Optional
Execution 175ms
Transfer 0 KB
Monthly Cost €1/mo
www.gstatic.com
Other
Optional
Execution 96ms
Transfer 303 KB
Unused 54%
Monthly Cost €0/mo
www.gstatic.com
Other
Optional
Execution 82ms
Transfer 58 KB
Unused 47%
Monthly Cost €0/mo
Google Tag Manager
Tag Manager
Optional
Execution 82ms
Transfer 156 KB
Unused 54%
Monthly Cost €0/mo
Google Tag Manager
Tag Manager
Optional
Execution 69ms
Transfer 132 KB
Unused 46%
Monthly Cost €0/mo
Google Tag Manager
Tag Manager
Optional
Execution 61ms
Transfer 143 KB
Unused 43%
Monthly Cost €0/mo

These scripts may cost more than they're worth

  • firebase.google.com adds 270ms and costs ~€1/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

firebase.google.com takes 270ms 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 www.gstatic.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

54% 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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