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https://city-data.com

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
89
GRADE
B
FIX
2
REVIEW
2
PASS
11
INFO
2

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

Mobile Desktop
60
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
66
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
92
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.

4.52 s

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

7.03 s

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

259 ms

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

0.002

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

4.52 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.

7.03 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
11 PASS 2 REVIEW 2 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 (558.8 KiB of 558.9 KiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
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
JS Execution Cost
Action
1434ms total JS execution
REVIEW
1434ms total JS execution
Warning::
https://www.city-data.com/: 524ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-VPW5...: 314ms CPU time
Warning::
https://ajax.googleapis.com/ajax/libs/jquery/1.12....: 285ms CPU time
Info::
Unattributable: 249ms CPU time
Info::
https://secure.quantserve.com/quant.js: 62ms CPU time
Warning::
Third-party scripts: 1434ms (100% of total)

Main Thread Breakdown

Script Evaluation 36% Style & Layout 24% Other 19% Parse HTML & CSS 9% Script Parsing & Compilation 9% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://www.city-data.com/524ms52ms55ms3rd
https://www.googletagmanager.com/gtag/js?id=G-VPW5MZTH4E314ms252ms48ms3rd
https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js285ms71ms10ms3rd
Unattributable249ms23ms0ms3rd
https://secure.quantserve.com/quant.js62ms31ms14ms3rd
B
JS Bundles
8 scripts, 60 KB unused
REVIEW
8 scripts, 60 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-VPW5...: 60 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 60 KB
60 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-VPW5MZTH4E153 KB60 KB (40%)✓3rd
https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js34 KB—✓3rd
https://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/js/bootstrap.min.js10 KB—✓3rd
https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js54 KB—✓3rd
https://www.google-analytics.com/ga.js17 KB—✓3rd
https://secure.quantserve.com/quant.js12 KB—✓3rd
https://www.city-data.com/a/util.js24 KB—✓3rd
https://www.city-data.com/js/cookie_notifier_js.php0 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

A+
Page Weight Budget
559 KB transferred, 27 requests
PASS
559 KB transferred, 27 requests
Info::
Page weighs 1.4 MB (559 KB transferred)
Info::
27 HTTP requests
Info::
Estimated 0.11 g CO2 per page load
559 KB / 2.4 MB budget
559 KB transferred
27 requests
0.11 g CO2 per page load
JavaScript 304.7 KiB 55%
HTML 222.3 KiB 40%
Other 16.9 KiB 3%
Fonts 13.7 KiB 2%
Other 756 B 0%
Other 550 B 0%
Images 0 B 0%
CSS 0 B 0%
0 2.4 MB 4.9 MB
Under budget
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
Image Optimization
7 images, 0 KB saveable
PASS
7 images, 0 KB saveable
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAQAA... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEA... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
7 images 0 KB
0 oversized -0 KB
0 legacy format
3 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

A+
Font Loading
6 fonts (14 KB)
PASS
6 fonts (14 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

14 KB total

Render-blocking

0

of 6

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 4.5 s LCP 7.0 shttps://pics3.city-data.com/fonts/glyphicons-halflings-regular.woff2glyphicons-halflings-re... https://pics3.city-data.com/fonts/glyphicons-halflings-regular.woff2 — 0 B — 26 ms — font-display: swaphttps://pics3.city-data.com/fonts/city-data.woff?73345346city-data.woff https://pics3.city-data.com/fonts/city-data.woff?73345346 — 0 B — 28 ms — font-display: swaphttps://fonts.gstatic.com/s/opensans/v15/mem8YaGs126MiZpBA-UFVZ0b.woff2mem8YaGs126MiZpBA-UFVZ0... https://fonts.gstatic.com/s/opensans/v15/mem8YaGs126MiZpBA-UFVZ0b.woff2 — 13.7 KiB — 45 ms — font-display: swaphttps://pics3.city-data.com/fonts/city-data.ttf?73345346city-data.ttf https://pics3.city-data.com/fonts/city-data.ttf?73345346 — 0 B — 58 ms — font-display: swaphttps://pics3.city-data.com/fonts/glyphicons-halflings-regular.woffglyphicons-halflings-re... https://pics3.city-data.com/fonts/glyphicons-halflings-regular.woff — 0 B — 54 ms — font-display: swaphttps://pics3.city-data.com/fonts/glyphicons-halflings-regular.ttfglyphicons-halflings-re... https://pics3.city-data.com/fonts/glyphicons-halflings-regular.ttf — 0 B — 61 ms — font-display: swap
glyphicons-halflings-re... woff2 swap
Size 0 KB
Load time 26 ms
Start 365 ms
Risk FOUT — text flashes from fallback to web font
city-data.woff woff swap
Size 0 KB
Load time 28 ms
Start 367 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
mem8YaGs126MiZpBA-UFVZ0... woff2 swap
Size 14 KB
Load time 45 ms
Start 369 ms
Risk FOUT — text flashes from fallback to web font
city-data.ttf ttf swap
Size 0 KB
Load time 58 ms
Start 592 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
glyphicons-halflings-re... woff swap
Size 0 KB
Load time 54 ms
Start 596 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
glyphicons-halflings-re... ttf swap
Size 0 KB
Load time 61 ms
Start 650 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)
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
10 hints, 0 missing preconnects
PASS
10 hints, 0 missing preconnects
Info::
Page uses 10 resource hint(s)

Current Resource Hints

preconnect
—
preload
10
dns-prefetch
—
prefetch
—

10 resource hints configured

A
Page Weight Inventory
27 resources · 559 KB · 60 KB savings available
PASS
27 resources · 559 KB · 60 KB savings available
Info::
Within 1MB page-weight target
Got: 559 KB
Info::
~60 KB of savings available
Warning::
26 third-party resources (100% of weight)
Info::
1 resources over 200KB
27 resources · 558.9 KiB · 26 third-party Within 1MB page-weight target
JavaScript 55% · 304.7 KiB
Document 40% · 222.5 KiB
Image 3% · 16.8 KiB
Font 2% · 13.7 KiB
Other 0% · 1.3 KiB
CSS 0% · 0 B

~60.5 KiB of savings available

Remove unused JavaScript: 60.5 KiB
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
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: OVHcloud

Network Waterfall
27 requests over 1533ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 4.5 s LCP 7.0 shttps://city-data.com// https://city-data.com/ — 301 — 136 B — 195 ms — h2https://www.city-data.com/www.city-data.com/ https://www.city-data.com/ — 200 — 222.3 KiB — 295 ms — h2https://pics3.city-data.com/fonts/glyphicons-halflings-regular.woff2pics3.city-data.com/fonts/glyphicon... https://pics3.city-data.com/fonts/glyphicons-halflings-regular.woff2 — -1 — 0 B — 26 ms — https://pics3.city-data.com/fonts/city-data.woff?73345346pics3.city-data.com/fonts/city-data... https://pics3.city-data.com/fonts/city-data.woff?73345346 — -1 — 0 B — 28 ms — https://pics3.city-data.com/assets/mobile/bg/1background.jpgpics3.city-data.com/assets/mobile/b... https://pics3.city-data.com/assets/mobile/bg/1background.jpg — -1 — 0 B — 32 ms — https://pics3.city-data.com/css/bootstrap.min.csspics3.city-data.com/css/bootstrap.m... https://pics3.city-data.com/css/bootstrap.min.css — -1 — 0 B — 27 ms — https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.jsajax.googleapis.com/ajax/libs/jquer... https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js — 200 — 33.8 KiB — 46 ms — h2https://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/js/bootstrap.min.jsmaxcdn.bootstrapcdn.com/bootstrap/3... https://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/js/bootstrap.min.js — 200 — 10.1 KiB — 46 ms — h3https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.jspagead2.googlesyndication.com/pagea... https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js — 200 — 54.3 KiB — 57 ms — h3https://www.google-analytics.com/ga.jswww.google-analytics.com/ga.js https://www.google-analytics.com/ga.js — 200 — 17.4 KiB — 42 ms — h2https://fonts.gstatic.com/s/opensans/v15/mem8YaGs126MiZpBA-UFVZ0b.woff2fonts.gstatic.com/s/opensans/v15/me... https://fonts.gstatic.com/s/opensans/v15/mem8YaGs126MiZpBA-UFVZ0b.woff2 — 200 — 13.7 KiB — 45 ms — h3https://www.googletagmanager.com/gtag/js?id=G-VPW5MZTH4Ewww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-VPW5MZTH4E — 200 — 153.2 KiB — 105 ms — h2https://secure.quantserve.com/quant.jssecure.quantserve.com/quant.js https://secure.quantserve.com/quant.js — 200 — 12.2 KiB — 30 ms — h2https://www.city-data.com/a/util.jswww.city-data.com/a/util.js https://www.city-data.com/a/util.js — 200 — 23.5 KiB — 106 ms — h2data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAQAAAACbCAQAAAAnrY3ZAAABBElEQVR42u3SQQEAAAQEMJec6Dr42…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAQAAAACbCAQAAAAnrY3ZAAABBElEQVR42u3SQQEAAAQEMJec6Dr42… — 200 — 0 B — 0 ms — datadata:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAWcAAAA8CAYAAAC6hnsNAAAf+ElEQVR4Ae3cZ7icZYH/8c/9PM/Mn…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAWcAAAA8CAYAAAC6hnsNAAAf+ElEQVR4Ae3cZ7icZYH/8c/9PM/Mn… — 200 — 0 B — 0 ms — datahttps://www.city-data.com/a/util.php?action_name=City-Data.com%20-%20Stats%20about%20all%20US%20cities%20-%20real%20estate%2C%20relocation%20info%2C%20crime%2C%20house%20prices%2C%20cost%20of%20living%2C%20races%2C%20home%20value%20estimator%2C%20recent%20sales%2C%20income%2C%20photos%2C%20schools%2C%20maps%2C%20weather%2C%20neighborhoods%2C%20and%20more&idsite=1&rec=1&r=318348&h=22&m=36&s=8&url=https%3A%2F%2Fwww.city-data.com%2F&_id=d8a7f4556d55bb8d&_idn=1&send_image=0&_refts=0&pv_id=emAxGx&devicePixelRatio=1.75&pf_net=0&pf_srv=96&pf_tfr=193&uadata=%7B%22formFactors%22%3A%5B%22Desktop%22%5D%2C%22fullVersionList%22%3A%5B%7B%22brand%22%3A%22Not-A.Brand%22%2C%22version%22%3A%2224.0.0.0%22%7D%2C%7B%22brand%22%3A%22Chromium%22%2C%22version%22%3A%22146.0.7680.164%22%7D%5D%2C%22mobile%22%3Atrue%2C%22model%22%3A%22moto%20g%20power%20(2022)%22%2C%22platform%22%3A%22Android%22%2C%22platformVersion%22%3A%2211.0%22%7D&pdf=1&qt=0&realp=0&wma=0&fla=0&java=0&ag=0&cookie=1&res=412x823www.city-data.com/a/util.php?action... https://www.city-data.com/a/util.php?action_name=City-Data.com%20-%20Stats%20about%20all%20US%20cities%20-%20real%20estate%2C%20relocation%20info%2C%20crime%2C%20house%20prices%2C%20cost%20of%20living%2C%20races%2C%20home%20value%20estimator%2C%20recent%20sales%2C%20income%2C%20photos%2C%20schools%2C%20maps%2C%20weather%2C%20neighborhoods%2C%20and%20more&idsite=1&rec=1&r=318348&h=22&m=36&s=8&url=https%3A%2F%2Fwww.city-data.com%2F&_id=d8a7f4556d55bb8d&_idn=1&send_image=0&_refts=0&pv_id=emAxGx&devicePixelRatio=1.75&pf_net=0&pf_srv=96&pf_tfr=193&uadata=%7B%22formFactors%22%3A%5B%22Desktop%22%5D%2C%22fullVersionList%22%3A%5B%7B%22brand%22%3A%22Not-A.Brand%22%2C%22version%22%3A%2224.0.0.0%22%7D%2C%7B%22brand%22%3A%22Chromium%22%2C%22version%22%3A%22146.0.7680.164%22%7D%5D%2C%22mobile%22%3Atrue%2C%22model%22%3A%22moto%20g%20power%20(2022)%22%2C%22platform%22%3A%22Android%22%2C%22platformVersion%22%3A%2211.0%22%7D&pdf=1&qt=0&realp=0&wma=0&fla=0&java=0&ag=0&cookie=1&res=412x823 — 204 — 197 B — 92 ms — h3https://www.city-data.com/js/cookie_notifier_js.phpwww.city-data.com/js/cookie_notifie... https://www.city-data.com/js/cookie_notifier_js.php — 200 — 242 B — 81 ms — h3data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='50px' height='50px'><polylin…www.w3.org/2000/svg' width='50px' h... data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='50px' height='50px'><polylin… — 200 — 0 B — 0 ms — datahttps://pics3.city-data.com/fonts/city-data.ttf?73345346pics3.city-data.com/fonts/city-data... https://pics3.city-data.com/fonts/city-data.ttf?73345346 — -1 — 0 B — 58 ms — https://pics3.city-data.com/fonts/glyphicons-halflings-regular.woffpics3.city-data.com/fonts/glyphicon... https://pics3.city-data.com/fonts/glyphicons-halflings-regular.woff — -1 — 0 B — 54 ms — https://pics3.city-data.com/fonts/glyphicons-halflings-regular.ttfpics3.city-data.com/fonts/glyphicon... https://pics3.city-data.com/fonts/glyphicons-halflings-regular.ttf — -1 — 0 B — 61 ms — https://analytics.google.com/g/collect?v=2&tid=G-VPW5MZTH4E&gtm=45je64k1v9131902819za200zd9131902819&_p=1776897367999&_gaz=1&gcd=13l3l3l3l1l1&npa=0&dma=0&_eu=AAAAAGA&are=1&cid=156600758.1776897368&frm=0&pscdl=noapi&rcb=12&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938468~117266401~117384406~117512542~118128923&sid=1776897368&sct=1&seg=0&dl=https%3A%2F%2Fwww.city-data.com%2F&dt=City-Data.com%20-%20Stats%20about%20all%20US%20cities%20-%20real%20estate%2C%20relocation%20info%2C%20crime%2C%20house%20prices%2C%20cost%20of%20living%2C%20races%2C%20home%20value%20estimator%2C%20recent%20sales%2C%20income%2C%20photos%2C%20schools%2C%20maps%2C%20weather%2C%20neighborhoods%2C%20and%20more&en=page_view&_fv=1&_nsi=1&_ss=1&_ee=1&tfd=689analytics.google.com/g/collect?v=2&... https://analytics.google.com/g/collect?v=2&tid=G-VPW5MZTH4E&gtm=45je64k1v9131902819za200zd9131902819&_p=1776897367999&_gaz=1&gcd=13l3l3l3l1l1&npa=0&dma=0&_eu=AAAAAGA&are=1&cid=156600758.1776897368&frm=0&pscdl=noapi&rcb=12&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938468~117266401~117384406~117512542~118128923&sid=1776897368&sct=1&seg=0&dl=https%3A%2F%2Fwww.city-data.com%2F&dt=City-Data.com%20-%20Stats%20about%20all%20US%20cities%20-%20real%20estate%2C%20relocation%20info%2C%20crime%2C%20house%20prices%2C%20cost%20of%20living%2C%20races%2C%20home%20value%20estimator%2C%20recent%20sales%2C%20income%2C%20photos%2C%20schools%2C%20maps%2C%20weather%2C%20neighborhoods%2C%20and%20more&en=page_view&_fv=1&_nsi=1&_ss=1&_ee=1&tfd=689 — 204 — 550 B — 58 ms — h2https://stats.g.doubleclick.net/g/collect?v=2&tid=G-VPW5MZTH4E&cid=156600758.1776897368&gtm=45je64k1v9131902819za200zd9131902819&rcb=12&aip=1&dma=0&gcd=13l3l3l3l1l1&npa=0&frm=0&tag_exp=0~115938466~115938468~117266401~117384406~117512542~118128923stats.g.doubleclick.net/g/collect?v... https://stats.g.doubleclick.net/g/collect?v=2&tid=G-VPW5MZTH4E&cid=156600758.1776897368&gtm=45je64k1v9131902819za200zd9131902819&rcb=12&aip=1&dma=0&gcd=13l3l3l3l1l1&npa=0&frm=0&tag_exp=0~115938466~115938468~117266401~117384406~117512542~118128923 — 204 — 559 B — 57 ms — h2https://www.city-data.com/favicon.icowww.city-data.com/favicon.ico https://www.city-data.com/favicon.ico — 200 — 16.8 KiB — 155 ms — h3data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxj…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxj… — 200 — 0 B — 0 ms — datahttps://pics3.city-data.com/assets/mobile/maps/states_bg.pngpics3.city-data.com/assets/mobile/m... https://pics3.city-data.com/assets/mobile/maps/states_bg.png — -1 — 0 B — 20 ms —
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 1434ms · 421KB · €16/mo
www.city-data.com
Other
Costly
Execution 524ms
Transfer 222 KB
Monthly Cost €6/mo
Google Tag Manager
Tag Manager
Costly
Execution 314ms
Transfer 153 KB
Unused 40%
Monthly Cost €3/mo
ajax.googleapis.com
Other
Costly
Execution 285ms
Transfer 34 KB
Monthly Cost €3/mo
Unattributable
Other
Costly
Execution 249ms
Transfer 0 KB
Monthly Cost €3/mo
secure.quantserve.com
Other
Optional
Execution 62ms
Transfer 12 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.city-data.com adds 524ms and costs ~€6/month
  • Google Tag Manager adds 314ms and costs ~€3/month
  • ajax.googleapis.com adds 285ms and costs ~€3/month
  • Unattributable adds 249ms 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.

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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.city-data.com takes 524ms 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 314ms 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

ajax.googleapis.com takes 285ms 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 249ms 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

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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