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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
3
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
88
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
99
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.
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.

1.29 s

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

1.66 s

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

2 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.

1.66 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.

2.83 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
7 PASS 3 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
D
JS Bundles
Action
48 scripts, 398 KB unused
FIX
48 scripts, 398 KB unused
Warning::
https://www.gstatic.com/devrel-devsite/prod/v2f052...: 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/v2f052...: 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/v2f052e0cca7362dede225b85c12aee59eabee5b8fbb05d44fc345ffb54861aec/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=4e64f0143 KB62 KB (43%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NDV7K7V5&l=atDataLayer131 KB61 KB (46%)✓3rd
https://www.gstatic.com/devrel-devsite/prod/v2f052e0cca7362dede225b85c12aee59eabee5b8fbb05d44fc345ffb54861aec/firebase/js/devsite_app_module.js58 KB27 KB (47%)✓3rd
https://www.gstatic.com/devrel-devsite/prod/v2f052e0cca7362dede225b85c12aee59eabee5b8fbb05d44fc345ffb54861aec/firebase/js/devsite_devsite_notification_module.js0 KB—✓3rd
https://www.gstatic.com/devrel-devsite/prod/v2f052e0cca7362dede225b85c12aee59eabee5b8fbb05d44fc345ffb54861aec/firebase/js/devsite_devsite_recommendations_sidebar_module.js0 KB—✓3rd
https://www.gstatic.com/devrel-devsite/prod/v2f052e0cca7362dede225b85c12aee59eabee5b8fbb05d44fc345ffb54861aec/firebase/js/devsite_devsite_actions_module.js0 KB—✓3rd
https://www.gstatic.com/devrel-devsite/prod/v2f052e0cca7362dede225b85c12aee59eabee5b8fbb05d44fc345ffb54861aec/firebase/js/devsite_devsite_analytics_module.js0 KB—✓3rd
https://www.gstatic.com/devrel-devsite/prod/v2f052e0cca7362dede225b85c12aee59eabee5b8fbb05d44fc345ffb54861aec/firebase/js/devsite_devsite_appearance_selector_module.js0 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
83 resources · 1.7 MB · 398 KB savings available
FIX
83 resources · 1.7 MB · 398 KB savings available
Warning::
Page weight 711 KB over 1MB target
Got: 1.7 MB Expected: ≤ 1 MB
Info::
~398 KB of savings available
Warning::
82 third-party resources (100% of weight)
Info::
1 resources over 200KB
83 resources · 1.7 MiB · 82 third-party 711.3 KiB over 1MB target
JavaScript 47% · 806.9 KiB
Image 27% · 470.1 KiB
Font 12% · 200.5 KiB
CSS 10% · 167.2 KiB
Document 5% · 88.3 KiB
Other 0% · 2.2 KiB

~397.6 KiB of savings available

Remove unused JavaScript: 397.6 KiB
C
Page Weight Budget
Action
1.7 MB transferred, 83 requests
REVIEW
1.7 MB transferred, 83 requests
Info::
Page weighs 5.3 MB (1.7 MB transferred)
Warning::
JavaScript is 807 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 807 KB
Info::
Fonts are 201 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 201 KB
Info::
83 HTTP requests
Info::
Estimated 0.36 g CO2 per page load
1.7 MB / 2.4 MB budget
1.7 MB transferred
83 requests
0.36 g CO2 per page load
JavaScript 806.9 KiB 47%
Images 470.1 KiB 27%
Fonts 200.5 KiB 12%
CSS 167.2 KiB 10%
HTML 88.0 KiB 5%
Other 1.2 KiB 0%
Other 1.0 KiB 0%
Other 232 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
12 images, 0 KB saveable
REVIEW
12 images, 0 KB saveable
Warning::
https://firebase.google.com/static/images/usecases... 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/usecases... 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.
Warning::
https://firebase.google.com/static/images/usecases... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
12 images 467 KB
0 oversized -0 KB
11 legacy format
8 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

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
567ms total JS execution
REVIEW
567ms total JS execution
Info::
https://firebase.google.com/products/crashlytics/: 201ms CPU time
Info::
Unattributable: 108ms CPU time
Info::
https://www.gstatic.com/devrel-devsite/prod/v2f052...: 79ms CPU time
Info::
https://www.gstatic.com/devrel-devsite/prod/v2f052...: 69ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-KFP...: 57ms CPU time
Warning::
Third-party scripts: 567ms (100% of total)

Main Thread Breakdown

Script Evaluation 41% Other 25% Style & Layout 18% Script Parsing & Compilation 9% Parse HTML & CSS 4% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://firebase.google.com/products/crashlytics/201ms6ms1ms3rd
Unattributable108ms8ms0ms3rd
https://www.gstatic.com/devrel-devsite/prod/v2f052e0cca7362dede225b85c12aee59eabee5b8fbb05d44fc345ffb54861aec/firebase/js/devsite_app_module.js79ms53ms5ms3rd
https://www.gstatic.com/devrel-devsite/prod/v2f052e0cca7362dede225b85c12aee59eabee5b8fbb05d44fc345ffb54861aec/firebase/js/devsite_app_custom_elements_module.js69ms34ms25ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KFPLMHC57ms47ms10ms3rd
https://www.googletagmanager.com/gtag/js?id=G-64EQFFKSHW&l=atDataLayer&cx=c&gtm=4e64f053ms45ms8ms3rd
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
4 fonts (201 KB)
PASS
4 fonts (201 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

201 KB total

Render-blocking

0

of 4

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 FCP 1.3 s LCP 1.7 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 — 93 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 — 134 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 — 114 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 0 B — 45 ms — font-display: swap
4UasrENHsxJlGDuGo1OIlJf... woff2 swap
Size 35 KB
Load time 93 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
flUhRq6tzZclQEJ-Vdg-Iui... woff2 swap
Size 126 KB
Load time 134 ms
Start 1.2 s
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
tDbV2o-flEEny0FZhsfKu5W... woff2 swap
Size 40 KB
Load time 114 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 0 KB
Load time 45 ms
Start 1.8 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
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Google Cloud

A
HTTP Caching
max-age=1800 (30 minutes)
PASS
max-age=1800 (30 minutes)
Info::
Cache-Control header is set
Got: public, max-age=1800
Info::
Effective TTL: 30 minutes (max-age=1800)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

public, max-age=1800

DirectiveValueMeaning
public—Any cache may store this response
max-age1800Cache for 30 minutes
Effective TTL: 1800 seconds
Network Waterfall
83 requests over 4624ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 1.3 s LCP 1.7 shttps://crashlytics.com// https://crashlytics.com/ — 301 — 232 B — 25 ms — h2https://firebase.google.com/products/crashlytics/firebase.google.com/products/crashl... https://firebase.google.com/products/crashlytics/ — 200 — 87.5 KiB — 783 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 — 3.2 KiB — 150 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 — 984 B — 147 ms — h2https://www.gstatic.com/devrel-devsite/prod/v2f052e0cca7362dede225b85c12aee59eabee5b8fbb05d44fc345ffb54861aec/firebase/css/app.csswww.gstatic.com/devrel-devsite/prod... https://www.gstatic.com/devrel-devsite/prod/v2f052e0cca7362dede225b85c12aee59eabee5b8fbb05d44fc345ffb54861aec/firebase/css/app.css — 200 — 154.1 KiB — 233 ms — h2https://www.gstatic.com/devrel-devsite/prod/v2f052e0cca7362dede225b85c12aee59eabee5b8fbb05d44fc345ffb54861aec/firebase/css/dark-theme.csswww.gstatic.com/devrel-devsite/prod... https://www.gstatic.com/devrel-devsite/prod/v2f052e0cca7362dede225b85c12aee59eabee5b8fbb05d44fc345ffb54861aec/firebase/css/dark-theme.css — 200 — 5.7 KiB — 132 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 — 799 B — 163 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 — 2.4 KiB — 165 ms — h2https://www.gstatic.com/devrel-devsite/prod/v2f052e0cca7362dede225b85c12aee59eabee5b8fbb05d44fc345ffb54861aec/firebase/images/lockup.svgwww.gstatic.com/devrel-devsite/prod... https://www.gstatic.com/devrel-devsite/prod/v2f052e0cca7362dede225b85c12aee59eabee5b8fbb05d44fc345ffb54861aec/firebase/images/lockup.svg — 200 — 3.4 KiB — 209 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 — 57 ms — h2https://firebase.google.com/static/images/products/crashlytics/crashlytics-hero_1x.pngfirebase.google.com/static/images/p... https://firebase.google.com/static/images/products/crashlytics/crashlytics-hero_1x.png — 200 — 116.6 KiB — 385 ms — h3https://firebase.google.com/static/images/products/crashlytics/Crashlytics_SolveCrashes.pngfirebase.google.com/static/images/p... https://firebase.google.com/static/images/products/crashlytics/Crashlytics_SolveCrashes.png — 200 — 84.7 KiB — 485 ms — h3https://firebase.google.com/static/images/products/crashlytics/Crashlytics_GeminiPowered.pngfirebase.google.com/static/images/p... https://firebase.google.com/static/images/products/crashlytics/Crashlytics_GeminiPowered.png — 200 — 21.3 KiB — 267 ms — h3https://firebase.google.com/static/images/products/crashlytics/Firebase_Crashlytics_Integrations_FinalArt.pngfirebase.google.com/static/images/p... https://firebase.google.com/static/images/products/crashlytics/Firebase_Crashlytics_Integrations_FinalArt.png — 200 — 104.7 KiB — 339 ms — h3https://firebase.google.com/static/images/products/crashlytics/Crashlytics_PowerfulInsights.pngfirebase.google.com/static/images/p... https://firebase.google.com/static/images/products/crashlytics/Crashlytics_PowerfulInsights.png — 200 — 47.2 KiB — 321 ms — h3https://firebase.google.com/static/images/products/crashlytics/Crashlytics_Feature01.pngfirebase.google.com/static/images/p... https://firebase.google.com/static/images/products/crashlytics/Crashlytics_Feature01.png — 200 — 21.9 KiB — 312 ms — h3https://firebase.google.com/static/images/products/crashlytics/Crashlytics_Feature02.pngfirebase.google.com/static/images/p... https://firebase.google.com/static/images/products/crashlytics/Crashlytics_Feature02.png — 200 — 6.8 KiB — 231 ms — h3https://firebase.google.com/static/images/products/crashlytics/Crashlytics_Feature03.pngfirebase.google.com/static/images/p... https://firebase.google.com/static/images/products/crashlytics/Crashlytics_Feature03.png — 200 — 28.8 KiB — 300 ms — h3https://firebase.google.com/static/images/usecases/stage-app.pngfirebase.google.com/static/images/u... 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— 204 — 551 B — 71 ms — h2https://firebase.google.com/_pwa/firebase/icons/icon-144x144.pngfirebase.google.com/_pwa/firebase/i... https://firebase.google.com/_pwa/firebase/icons/icon-144x144.png — 200 — 0 B — 42 ms — h3https://www.gstatic.com/devrel-devsite/prod/v2f052e0cca7362dede225b85c12aee59eabee5b8fbb05d44fc345ffb54861aec/firebase/images/favicon.pngwww.gstatic.com/devrel-devsite/prod... https://www.gstatic.com/devrel-devsite/prod/v2f052e0cca7362dede225b85c12aee59eabee5b8fbb05d44fc345ffb54861aec/firebase/images/favicon.png — 200 — 0 B — 1 ms — h3https://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 — 140 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 — 137 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 567ms · 748KB · €2/mo
firebase.google.com
Other
Costly
Execution 201ms
Transfer 88 KB
Monthly Cost €1/mo
Unattributable
Other
Optional
Execution 108ms
Transfer 0 KB
Monthly Cost €0/mo
www.gstatic.com
Other
Optional
Execution 79ms
Transfer 58 KB
Unused 47%
Monthly Cost €0/mo
www.gstatic.com
Other
Optional
Execution 69ms
Transfer 303 KB
Unused 54%
Monthly Cost €0/mo
Google Tag Manager
Tag Manager
Optional
Execution 57ms
Transfer 156 KB
Unused 54%
Monthly Cost €0/mo
Google Tag Manager
Tag Manager
Optional
Execution 53ms
Transfer 143 KB
Unused 43%
Monthly Cost €0/mo

These scripts may cost more than they're worth

  • firebase.google.com adds 201ms 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 201ms 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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