Performance

· 22 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.

573 ms

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

1.52 s

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

27 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.

573 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

1.57 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

13 PASS 6 REVIEW

Page Weight Budget

1.3 MB transferred, 42 requests

REVIEW

1.3 MB transferred, 42 requests

Page weighs 1.8 MB (1.3 MB transferred)

Images are 1.0 MB — compress or use modern formats

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

Got: 1.0 MB

42 HTTP requests

Estimated 0.27 g CO2 per page load

1.3 MB transferred

42 requests

0.27 g CO2 per page load

Images 1.0 MiB 80%

JavaScript 209.8 KiB 16%

CSS 24.2 KiB 2%

HTML 16.8 KiB 1%

Other 7.6 KiB 1%

Other 2.0 KiB 0%

Other 504 B 0%

0 2.4 MB 4.9 MB

Under budget

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

Image Optimization

Action

31 images, 0 KB saveable

REVIEW

31 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.

https://americancompanies.com/media/logos/nvidia-c... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

31 images 1.0 MB

0 oversized -0 KB

31 legacy format

2 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

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

42 resources · 1.3 MB · 121 KB savings available

REVIEW

42 resources · 1.3 MB · 121 KB savings available

Page weight 1.3 MB exceeds 1 MB target by 288 KB

Got: 1.3 MB Expected: ≤ 1 MB

~121 KB of savings available

2 third-party resources (13% of weight)

42 resources · 1.3 MiB · 2 third-party 288.5 KiB over 1MB target

Image 81% · 1.0 MiB

JavaScript 16% · 209.8 KiB

CSS 2% · 24.2 KiB

Document 1% · 16.8 KiB

Other 0% · 3.2 KiB

~120.9 KiB of savings available

Remove unused JavaScript: 120.9 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

42 resources			1.3 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 (165.9 KiB of 1.3 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+

JS Execution Cost

284ms total JS execution

PASS

284ms total JS execution

https://americancompanies.com/: 125ms CPU time

https://americancompanies.com/static/js/bundle.8b1...: 97ms CPU time

Unattributable: 62ms CPU time

Main Thread Breakdown

Script Evaluation 37% Other 26% Style & Layout 20% Rendering 6% Script Parsing & Compilation 4% Parse HTML & CSS 4%

Script	Total	Scripting	Parse/Compile	Party
https://americancompanies.com/	125ms	3ms	0ms	1st
https://americancompanies.com/static/js/bundle.8b1bd1f92838.js	97ms	79ms	3ms	1st
Unattributable	62ms	2ms	0ms	1st

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.

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

42 requests over 604ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

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.