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https://chicago.gov

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
37
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.

10.16 s

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

19.91 s

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

781 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.

10.16 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.

20.13 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
17
7 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
3.2 MB transferred, 93 requests
FIX
3.2 MB transferred, 93 requests
Warning::
Page weighs 8.0 MB (3.2 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 1.1 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.1 MB
Info::
Fonts are 312 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 312 KB
Info::
93 HTTP requests
Info::
Estimated 0.66 g CO2 per page load
3.2 MB / 2.4 MB budget
3.2 MB transferred
93 requests
0.66 g CO2 per page load
JavaScript 1.5 MiB 47%
Images 1.1 MiB 34%
Fonts 311.5 KiB 10%
CSS 186.0 KiB 6%
HTML 79.7 KiB 2%
Other 4.8 KiB 0%
Other 4.8 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 (3.2 MiB of 3.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
3747ms total JS execution
FIX
3747ms total JS execution
Warning::
https://www.chicago.gov/city/en.html: 1119ms CPU time
Warning::
Unattributable: 492ms CPU time
Warning::
https://translate.googleapis.com/_/translate_http/...: 426ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-S6KE...: 420ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-M848...: 292ms CPU time
Warning::
Third-party scripts: 3747ms (100% of total)

Main Thread Breakdown

Script Evaluation 42% Other 21% Style & Layout 17% Script Parsing & Compilation 10% Rendering 6% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.chicago.gov/city/en.html1119ms13ms8ms3rd
Unattributable492ms12ms0ms3rd
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_main426ms275ms60ms3rd
https://www.googletagmanager.com/gtag/js?id=G-S6KEDJQPEW420ms310ms58ms3rd
https://www.googletagmanager.com/gtag/js?id=G-M8487EJXRJ&cx=c&gtm=4e64k1292ms236ms54ms3rd
https://cdnjs.cloudflare.com/ajax/libs/elasticsearch/16.7.1/elasticsearch.min.js287ms213ms72ms3rd
https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.min.js238ms162ms11ms3rd
https://www.googletagmanager.com/gtag/js?id=UA-2412440-18&cx=c&gtm=4e64k1234ms166ms49ms3rd
https://cdnjs.cloudflare.com/ajax/libs/flickity/2.2.2/flickity.pkgd.min.js102ms46ms22ms3rd
https://siteimproveanalytics.com/js/siteanalyze_6451.js83ms71ms9ms3rd

Showing top 10 of 11 scripts

D
Page Weight Inventory
Action
93 resources · 3.2 MB · 285 KB savings available
FIX
93 resources · 3.2 MB · 285 KB savings available
Warning::
Page weight 2.2 MB over 1MB target
Got: 3.2 MB Expected: ≤ 1 MB
Info::
~285 KB of savings available
Warning::
92 third-party resources (100% of weight)
Info::
2 resources over 200KB
93 resources · 3.2 MiB · 92 third-party 2.2 MiB over 1MB target
JavaScript 47% · 1.5 MiB
Image 35% · 1.1 MiB
Font 10% · 311.5 KiB
CSS 6% · 186.0 KiB
Document 2% · 79.9 KiB
Other 0% · 6.5 KiB

~285.4 KiB of savings available

Remove unused JavaScript: 285.4 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
36 images, 0 KB saveable
REVIEW
36 images, 0 KB saveable
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/rNLEekZ9XzY/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/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/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/close... 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/dhr... 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/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/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/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/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/homepage/... 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/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/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/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/depts/fin... 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.
36 images 1.1 MB
0 oversized -0 KB
35 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 Bundles
Action
21 scripts, 285 KB unused
REVIEW
21 scripts, 285 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...: 63 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 285 KB
285 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 KB63 KB (43%)✓3rd
https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js17 KB—✓3rd
https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.5f0apfZzpOA.2021.O/am=AAAABA/d=1/br=1/rs=AGKMywFg3MG1UeKh8ePjbhY_YEMv-NHjmA/m=root,base140 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
7 fonts (312 KB)
PASS
7 fonts (312 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

312 KB total

Render-blocking

0

of 7

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 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s FCP 10.2 s LCP 19.9 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 — 19 ms — font-display: swaphttps://fonts.gstatic.com/s/bigshoulderstext/v28/55xxezRtP9G3CGPIf49hxc8P0eytUxBcm4Z6YsECdA.woff255xxezRtP9G3CGPIf49hxc8... https://fonts.gstatic.com/s/bigshoulderstext/v28/55xxezRtP9G3CGPIf49hxc8P0eytUxBcm4Z6YsECdA.woff2 — 35.4 KiB — 19 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 — 177 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 — 170 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 — 125 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 39 ms — font-display: swap
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 37 KB
Load time 10 ms
Start 457 ms
Risk FOUT — text flashes from fallback to web font
0QIvMX1D_JOuMwr7I_FMl_E... woff2 swap
Size 37 KB
Load time 19 ms
Start 458 ms
Risk FOUT — text flashes from fallback to web font
55xxezRtP9G3CGPIf49hxc8... woff2 swap
Size 35 KB
Load time 19 ms
Start 458 ms
Risk FOUT — text flashes from fallback to web font
fa-solid-900.woff2 woff2 swap
Size 79 KB
Load time 177 ms
Start 458 ms
Risk FOUT — text flashes from fallback to web font
fa-brands-400.woff2 woff2 swap
Size 76 KB
Load time 170 ms
Start 549 ms
Risk FOUT — text flashes from fallback to web font
fa-regular-400.woff2 woff2 swap
Size 14 KB
Load time 125 ms
Start 549 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 39 ms
Start 796 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
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
93 requests over 3980ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s FCP 10.2 s LCP 19.9 shttps://chicago.gov// https://chicago.gov/ — 301 — 98 B — 23 ms — h2https://www.chicago.gov/www.chicago.gov/ https://www.chicago.gov/ — 302 — 181 B — 66 ms — h2https://www.chicago.gov/city/en.htmlwww.chicago.gov/city/en.html https://www.chicago.gov/city/en.html — 200 — 23.7 KiB — 45 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 — 164 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 — 133 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 — 15 ms — 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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 3747ms · 702KB · €41/mo
www.chicago.gov
Other
Costly
Execution 1119ms
Transfer 24 KB
Monthly Cost €12/mo
Unattributable
Other
Costly
Execution 492ms
Transfer 0 KB
Monthly Cost €5/mo
translate.googleapis.com
Other
Costly
Execution 426ms
Transfer 119 KB
Unused 78%
Monthly Cost €5/mo
Google Tag Manager
Tag Manager
Costly
Execution 420ms
Transfer 157 KB
Unused 41%
Monthly Cost €5/mo
Google Tag Manager
Tag Manager
Costly
Execution 292ms
Transfer 146 KB
Unused 43%
Monthly Cost €3/mo
cdnjs
CDN
Costly
Execution 287ms
Transfer 51 KB
Monthly Cost €3/mo
cdnjs
CDN
Costly
Execution 238ms
Transfer 28 KB
Monthly Cost €3/mo
Google Tag Manager
Tag Manager
Costly
Execution 234ms
Transfer 125 KB
Unused 52%
Monthly Cost €3/mo
cdnjs
CDN
Optional
Execution 102ms
Transfer 13 KB
Monthly Cost €1/mo
siteimproveanalytics.com
Other
Optional
Execution 83ms
Transfer 19 KB
Monthly Cost €1/mo
Google Analytics
Analytics
Optional
Execution 53ms
Transfer 21 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.chicago.gov adds 1119ms and costs ~€12/month
  • Unattributable adds 492ms and costs ~€5/month
  • translate.googleapis.com adds 426ms and costs ~€5/month
  • Google Tag Manager adds 420ms and costs ~€5/month
  • Google Tag Manager adds 292ms and costs ~€3/month
  • cdnjs adds 287ms and costs ~€3/month
  • cdnjs adds 238ms and costs ~€3/month
  • Google Tag Manager adds 234ms and costs ~€3/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 1119ms 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 492ms 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

translate.googleapis.com takes 426ms 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

Google Tag Manager takes 420ms 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 292ms 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

cdnjs takes 287ms 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

cdnjs takes 238ms 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 234ms 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

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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