Performance

· 27 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

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

Mobile Desktop

Performance

Accessibility

Best Practices

100

SEO

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

1.81 s

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

4.31 s

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

156 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.

1.81 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.

4.80 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

16 PASS 7 REVIEW

Page Weight Budget

1.2 MB transferred, 34 requests

REVIEW

1.2 MB transferred, 34 requests

Page weighs 1.7 MB (1.2 MB transferred)

34 HTTP requests

Estimated 0.26 g CO2 per page load

1.2 MB transferred

34 requests

0.26 g CO2 per page load

Images 988.1 KiB 79%

JavaScript 209.3 KiB 17%

CSS 23.9 KiB 2%

HTML 16.8 KiB 1%

Other 7.4 KiB 1%

Other 2.0 KiB 0%

Other 503 B 0%

0 2.4 MB 4.9 MB

Under budget

Image Optimization

23 images, 0 KB saveable

REVIEW

23 images, 0 KB saveable

https://americancompanies.com/static/img/logo.19b5... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

23 images 988 KB

0 oversized -0 KB

23 legacy format

1 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

JS Execution Cost

Action

1278ms total JS execution

REVIEW

1278ms total JS execution

https://americancompanies.com/: 553ms CPU time

https://americancompanies.com/static/js/bundle.8b1...: 363ms CPU time

Unattributable: 223ms CPU time

https://www.googletagmanager.com/gtag/js?id=G-ESQB...: 138ms CPU time

Third-party scripts: 138ms (11% of total)

Main Thread Breakdown

Script Evaluation 35% Style & Layout 25% Other 24% Rendering 7% Parse HTML & CSS 5% Script Parsing & Compilation 4%

Script	Total	Scripting	Parse/Compile	Party
https://americancompanies.com/	553ms	14ms	1ms	1st
https://americancompanies.com/static/js/bundle.8b1bd1f92838.js	363ms	300ms	11ms	1st
Unattributable	223ms	7ms	0ms	1st
https://www.googletagmanager.com/gtag/js?id=G-ESQBGT1FZ0	138ms	102ms	35ms	3rd

JS Bundles

4 scripts, 121 KB unused

REVIEW

4 scripts, 121 KB unused

https://www.googletagmanager.com/gtag/js?id=G-ESQB...: 93 KB unused (60%)

Consider code splitting or tree shaking to reduce unused code.

https://americancompanies.com/static/js/bundle.8b1...: 28 KB unused (68%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 121 KB

121 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://www.googletagmanager.com/gtag/js?id=G-ESQBGT1FZ0	156 KB	93 KB (60%)	✓	3rd
https://americancompanies.com/static/js/bundle.8b1bd1f92838.js	42 KB	28 KB (68%)	✓	1st
https://static.cloudflareinsights.com/beacon.min.js/v31edd6df95cf4e85bb4c19e7a9bdbcba1788362987495	10 KB	—	✓	3rd
https://americancompanies.com/static/js/ax-beacon.367b0b8ae096.js	2 KB	—	✓	1st

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

Page Weight Inventory

34 resources · 1.2 MB · 121 KB savings available

REVIEW

34 resources · 1.2 MB · 121 KB savings available

Page weight 1.2 MB exceeds 1 MB target by 224 KB

Got: 1.2 MB Expected: ≤ 1 MB

~121 KB of savings available

2 third-party resources (13% of weight)

34 resources · 1.2 MiB · 2 third-party 224.1 KiB over 1MB target

Image 80% · 995.1 KiB

JavaScript 17% · 209.3 KiB

CSS 2% · 23.9 KiB

Document 1% · 16.8 KiB

Other 0% · 3.0 KiB

~120.8 KiB of savings available

Remove unused JavaScript: 120.8 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

34 resources			1.2 MiB

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

HTTP Caching

public, s-maxage=600, max-age=0, stale-while-revalidate=60

REVIEW

public, s-maxage=600, max-age=0, stale-while-revalidate=60

Cache-Control header is set

Got: public, s-maxage=600, max-age=0, stale-while-revalidate=60

CDN TTL: 10 minutes (s-maxage=600)

Last-Modified header present

Cache-Control

public, s-maxage=600, max-age=0, stale-while-revalidate=60

Directive	Value	Meaning
public	—	Any cache may store this response
s-maxage	600	CDN caches for 10 minutes
max-age	0	Cache for 0 seconds
stale-while-revalidate	60	Serve stale for 1 minute while fetching fresh

A+

Third-Party Impact

13% third-party, 0 ms blocking

PASS

13% third-party, 0 ms blocking

Third-party code accounts for 13% of page weight (165.7 KiB of 1.2 MiB)

Third-party blocking time is low (0 ms)

87%

First-party Third-party

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

A+

Font Loading

No web fonts (system fonts)

PASS

No web fonts (system fonts)

No web fonts loaded — system fonts are fastest

No web fonts loaded — system fonts are optimal.

A+

Resource Caching

All resources properly cached

PASS

All resources properly cached

No caching issues found

All static resources have appropriate caching headers.

A+

Critical Rendering Path

No render-blocking resources

PASS

No render-blocking resources

No render-blocking resources detected

A+

Resource Hints

No optimization needed

PASS

No optimization needed

No resource hint issues

A+

HTTP/3 (QUIC)

HTTP/3 advertised via Alt-Svc

PASS

HTTP/3 advertised via Alt-Svc

HTTP/3 (QUIC) is supported

First-load mobile users on cellular networks see meaningful latency improvements with HTTP/3. The QUIC transport collapses TLS + TCP handshakes into one and recovers faster from packet loss.

A+

Document Compression

Document response uses brotli

PASS

Document response uses brotli

Main HTML response uses brotli (Content-Encoding: br)

Brotli is the best text-compression algorithm for general use, ~20% smaller than gzip on average (40% on smaller files). Modern browsers all support it.

A+

LCP Image Preload

LCP preload audit not available

PASS

LCP preload audit not available

LCP image preload audit not available for this scan

A+

Main HTML Cache-Control

Main HTML max-age=0 (≤ 5min) is appropriate

PASS

Main HTML max-age=0 (≤ 5min) is appropriate

Got: public, s-maxage=600, max-age=0, stale-while-revalidate=60

A+

Server-Timing Observability

3 Server-Timing entries advertised

PASS

3 Server-Timing entries advertised

Server-Timing header advertises 3 timing entries

A+

Server Response Intelligence

2 server-response signal(s) detected

PASS

2 server-response signal(s) detected

`Vary` header declared: accept-encoding

The page declares a `Vary` header, telling downstream caches which request headers the response varies on. Critical for content-negotiated responses (compression, language, cookies, device class).

`Last-Modified` present -- timestamp-based conditional GET supported

Consider also setting `ETag` for stronger revalidation -- ETags are content hashes that don't suffer from clock-skew or DST issues. Last-Modified alone is functional for conditional GETs and not a bug.

A+

Render-Blocking Resources

No render-blocking resources detected

PASS

No render-blocking resources detected

No render-blocking resources detected in <head>

A+

Third-Party Resources

No third-party resources detected

PASS

No third-party resources detected

A+

JavaScript Blocking

No render-blocking JS or document.write usage detected

PASS

No render-blocking JS or document.write usage detected

No JavaScript blocking issues detected

A+

CSS Performance Depth

No CSS performance depth issues detected

PASS

No CSS performance depth issues detected

Asset Compression

No text asset hosts to measure

INFO

No text asset hosts to measure

No third-party or subdomain host served enough text assets to measure

Asset compression is measured per host, from one HEAD request against a sampled resource. Pages that serve all their JS and CSS from the document's own origin are covered by the document compression check instead.

Network Waterfall

34 requests over 1156ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Third-Party Script Cost

Per-script blocking time, transfer cost, and cache headers

INFO

11% of JavaScript execution is third-party

First-party Third-party 138ms · 156KB · €2/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
Google Tag Manager www.googletagmanager.com	Tag Manager	138ms	156 KB	60%	€2/mo	Optional

Google Tag Manager

Tag Manager

Optional

Execution 138ms

Transfer 156 KB

Unused 60%

Monthly Cost €2/mo

60% 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

Image Optimization

45 images, 521 KB total, 338 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

521 KB

Oversized

Wasted

338 KB

45 missing dimensions

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.