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https://chicago.gov

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
4
REVIEW
4
PASS
5
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.
97
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.
100
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.

1.43 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.

66 ms

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

0.024

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

1.45 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.

3.14 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
F
Page Weight Budget
Action
3.3 MB transferred, 94 requests
FIX
3.3 MB transferred, 94 requests
Warning::
Page weighs 8.1 MB (3.3 MB transferred)
Warning::
JavaScript is 1.5 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.5 MB
Warning::
Images are 1.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.2 MB
Info::
Fonts are 332 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 332 KB
Info::
94 HTTP requests
Info::
Estimated 0.69 g CO2 per page load
3.3 MB / 2.4 MB budget
3.3 MB transferred
94 requests
0.69 g CO2 per page load
JavaScript 1.5 MiB 46%
Images 1.2 MiB 36%
Fonts 332.3 KiB 10%
CSS 186.0 KiB 6%
HTML 80.7 KiB 2%
Other 5.0 KiB 0%
Other 4.7 KiB 0%
Other 1.8 KiB 0%
Other 549 B 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

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

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 (3.3 MiB of 3.3 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
94 resources · 3.3 MB · 286 KB savings available
FIX
94 resources · 3.3 MB · 286 KB savings available
Warning::
Page weight 2.3 MB over 1MB target
Got: 3.3 MB Expected: ≤ 1 MB
Info::
~286 KB of savings available
Warning::
93 third-party resources (100% of weight)
Info::
2 resources over 200KB
94 resources · 3.3 MiB · 93 third-party 2.3 MiB over 1MB target
JavaScript 46% · 1.5 MiB
Image 36% · 1.2 MiB
Font 10% · 332.3 KiB
CSS 6% · 186.0 KiB
Document 2% · 81.0 KiB
Other 0% · 6.4 KiB

~286.2 KiB of savings available

Remove unused JavaScript: 286.2 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
Image Optimization
Action
37 images, 0 KB saveable
REVIEW
37 images, 0 KB saveable
Warning::
https://www.chicago.gov/content/dam/city/sites/can... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.chicago.gov/content/dam/city/homepage/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://i.ytimg.com/vi/Fd8lr-DJoWk/mqdefault.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.chicago.gov/content/dam/city/depts/may... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.chicago.gov/content/dam/city/homepage/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.chicago.gov/content/dam/city/homepage/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.chicago.gov/content/dam/city/homepage/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.chicago.gov/content/dam/city/depts/fin... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.chicago.gov/content/dam/city/depts/str... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.chicago.gov/content/dam/city/depts/fin... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.chicago.gov/content/dam/city/homepage/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.chicago.gov/content/dam/city/cds/safar... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.chicago.gov/content/dam/city/depts/dhr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://i.ytimg.com/vi/rNLEekZ9XzY/mqdefault.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://i.ytimg.com/vi/-bV0D0R0tEA/mqdefault.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.chicago.gov/content/dam/city/homepage/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.chicago.gov/content/dam/city/homepage/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.chicago.gov/content/dam/city/cds/city_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.chicago.gov/content/dam/city/depts/may... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.chicago.gov/content/dam/city/cds/chica... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.chicago.gov/content/dam/city/depts/may... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
37 images 1.2 MB
0 oversized -0 KB
36 legacy format
21 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

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

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

C
JS Execution Cost
Action
1090ms total JS execution
REVIEW
1090ms total JS execution
Warning::
https://www.chicago.gov/city/en.html: 404ms CPU time
Info::
Unattributable: 156ms CPU time
Info::
https://translate.googleapis.com/_/translate_http/...: 131ms CPU time
Info::
https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4....: 100ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-S6KE...: 93ms CPU time
Warning::
Third-party scripts: 1090ms (100% of total)

Main Thread Breakdown

Script Evaluation 36% Other 23% Style & Layout 20% Script Parsing & Compilation 9% Rendering 8% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.chicago.gov/city/en.html404ms7ms2ms3rd
Unattributable156ms3ms0ms3rd
https://translate.googleapis.com/_/translate_http/_/js/k=translate_http.tr.en_US.VRmZKspy56E.O/am=AAAAAQ/d=1/exm=el_conf/ed=1/rs=AN8SPfr19FYIaQWCvBYtl2_gp8OxhpIGyQ/m=el_main131ms80ms13ms3rd
https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.min.js100ms51ms3ms3rd
https://www.googletagmanager.com/gtag/js?id=G-S6KEDJQPEW93ms77ms15ms3rd
https://cdnjs.cloudflare.com/ajax/libs/elasticsearch/16.7.1/elasticsearch.min.js88ms60ms28ms3rd
https://www.googletagmanager.com/gtag/js?id=G-M8487EJXRJ&cx=c&gtm=4e64k168ms55ms13ms3rd
https://www.googletagmanager.com/gtag/js?id=UA-2412440-18&cx=c&gtm=4e64k150ms38ms11ms3rd
C
JS Bundles
Action
21 scripts, 286 KB unused
REVIEW
21 scripts, 286 KB unused
Warning::
https://translate.googleapis.com/_/translate_http/...: 93 KB unused (78%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=UA-241...: 65 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-S6KE...: 65 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-M848...: 64 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 286 KB
286 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://translate.googleapis.com/_/translate_http/_/js/k=translate_http.tr.en_US.VRmZKspy56E.O/am=AAAAAQ/d=1/exm=el_conf/ed=1/rs=AN8SPfr19FYIaQWCvBYtl2_gp8OxhpIGyQ/m=el_main119 KB93 KB (78%)✓3rd
https://www.googletagmanager.com/gtag/js?id=UA-2412440-18&cx=c&gtm=4e64k1125 KB65 KB (52%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-S6KEDJQPEW157 KB65 KB (41%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-M8487EJXRJ&cx=c&gtm=4e64k1146 KB64 KB (44%)✓3rd
https://cdnjs.cloudflare.com/ajax/libs/elasticsearch/16.7.1/elasticsearch.min.js51 KB—✓3rd
https://www.youtube.com/s/player/1bb6ee63/player_embed_es6.vflset/en_US/base.js436 KB—✓3rd
https://webapps1.chicago.gov/cdn/chiwds/0.9.1/js/uswds.min.js10 KB—✓3rd
https://cdn.jsdelivr.net/npm/popper.js@1.16.0/dist/umd/popper.min.js8 KB—✓3rd
https://translate.google.com/translate_a/element.js?cb=googleTranslateElementInit28 KB—✓3rd
https://siteimproveanalytics.com/js/siteanalyze_6451.js19 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
8 fonts (332 KB)
PASS
8 fonts (332 KB)
Info::
8 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

8

332 KB total

Render-blocking

0

of 8

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 1.4 s LCP 1.7 shttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 36.7 KiB — 10 ms — font-display: swaphttps://fonts.gstatic.com/s/lora/v37/0QIvMX1D_JOuMwr7I_FMl_E.woff20QIvMX1D_JOuMwr7I_FMl_E... https://fonts.gstatic.com/s/lora/v37/0QIvMX1D_JOuMwr7I_FMl_E.woff2 — 36.9 KiB — 21 ms — font-display: swaphttps://fonts.gstatic.com/s/bigshoulderstext/v28/55xxezRtP9G3CGPIf49hxc8P0eytUxBcm4Z6YsECdA.woff255xxezRtP9G3CGPIf49hxc8... https://fonts.gstatic.com/s/bigshoulderstext/v28/55xxezRtP9G3CGPIf49hxc8P0eytUxBcm4Z6YsECdA.woff2 — 35.4 KiB — 24 ms — font-display: swaphttps://webapps1.chicago.gov/cdn/FontAwesome-5.13.0/webfonts/fa-solid-900.woff2fa-solid-900.woff2 https://webapps1.chicago.gov/cdn/FontAwesome-5.13.0/webfonts/fa-solid-900.woff2 — 78.6 KiB — 200 ms — font-display: swaphttps://webapps1.chicago.gov/cdn/FontAwesome-5.13.0/webfonts/fa-regular-400.woff2fa-regular-400.woff2 https://webapps1.chicago.gov/cdn/FontAwesome-5.13.0/webfonts/fa-regular-400.woff2 — 14.2 KiB — 82 ms — font-display: swaphttps://webapps1.chicago.gov/cdn/FontAwesome-5.13.0/webfonts/fa-brands-400.woff2fa-brands-400.woff2 https://webapps1.chicago.gov/cdn/FontAwesome-5.13.0/webfonts/fa-brands-400.woff2 — 75.8 KiB — 137 ms — font-display: swaphttps://fonts.gstatic.com/s/lora/v37/0QIvMX1D_JOuMw77I_FMl_GW8g.woff20QIvMX1D_JOuMw77I_FMl_G... https://fonts.gstatic.com/s/lora/v37/0QIvMX1D_JOuMw77I_FMl_GW8g.woff2 — 20.8 KiB — 12 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 24 ms — font-display: swap
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 37 KB
Load time 10 ms
Start 498 ms
Risk FOUT — text flashes from fallback to web font
0QIvMX1D_JOuMwr7I_FMl_E... woff2 swap
Size 37 KB
Load time 21 ms
Start 498 ms
Risk FOUT — text flashes from fallback to web font
55xxezRtP9G3CGPIf49hxc8... woff2 swap
Size 35 KB
Load time 24 ms
Start 499 ms
Risk FOUT — text flashes from fallback to web font
fa-solid-900.woff2 woff2 swap
Size 79 KB
Load time 200 ms
Start 499 ms
Risk FOUT — text flashes from fallback to web font
fa-regular-400.woff2 woff2 swap
Size 14 KB
Load time 82 ms
Start 552 ms
Risk FOUT — text flashes from fallback to web font
fa-brands-400.woff2 woff2 swap
Size 76 KB
Load time 137 ms
Start 552 ms
Risk FOUT — text flashes from fallback to web font
0QIvMX1D_JOuMw77I_FMl_G... woff2 swap
Size 21 KB
Load time 12 ms
Start 695 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 24 ms
Start 903 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
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
94 requests over 2023ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.4 s LCP 1.7 shttps://chicago.gov// https://chicago.gov/ — 301 — 98 B — 44 ms — h2https://www.chicago.gov/www.chicago.gov/ https://www.chicago.gov/ — 302 — 324 B — 107 ms — h2https://www.chicago.gov/city/en.htmlwww.chicago.gov/city/en.html https://www.chicago.gov/city/en.html — 200 — 23.7 KiB — 68 ms — h2https://webapps1.chicago.gov/cdn/chiwds/0.9.1/css/main.min.csswebapps1.chicago.gov/cdn/chiwds/0.9... https://webapps1.chicago.gov/cdn/chiwds/0.9.1/css/main.min.css — 200 — 45.9 KiB — 125 ms — http/1.1https://webapps1.chicago.gov/cdn/FontAwesome-5.13.0/css/all.min.csswebapps1.chicago.gov/cdn/FontAwesom... https://webapps1.chicago.gov/cdn/FontAwesome-5.13.0/css/all.min.css — 200 — 19.4 KiB — 107 ms — http/1.1https://www.chicago.gov/content/dam/city/cds/css/cds.css?v1www.chicago.gov/content/dam/city/cd... https://www.chicago.gov/content/dam/city/cds/css/cds.css?v1 — 200 — 2.7 KiB — 19 ms — 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— h2
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 1090ms · 649KB · €12/mo
www.chicago.gov
Other
Costly
Execution 404ms
Transfer 24 KB
Monthly Cost €4/mo
Unattributable
Other
Optional
Execution 156ms
Transfer 0 KB
Monthly Cost €2/mo
translate.googleapis.com
Other
Optional
Execution 131ms
Transfer 119 KB
Unused 78%
Monthly Cost €1/mo
cdnjs
CDN
Optional
Execution 100ms
Transfer 28 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 93ms
Transfer 157 KB
Unused 41%
Monthly Cost €1/mo
cdnjs
CDN
Optional
Execution 88ms
Transfer 51 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 68ms
Transfer 146 KB
Unused 44%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 50ms
Transfer 125 KB
Unused 52%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.chicago.gov adds 404ms and costs ~€4/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.chicago.gov 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

78% of translate.googleapis.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

52% 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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