Performance

· 26 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

100

Accessibility

100

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.

2.88 s

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

3.35 s

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

71 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.

4.85 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.

3.45 s

Page Load Progression

591 ms

1.2 s

1.8 s

2.4 s

3.0 s

3.5 s

4.1 s

4.7 s

Checks

18 PASS 3 REVIEW 2 FIX

JS Execution Cost

Action

2387ms total JS execution

FIX

2387ms total JS execution

https://18webdesign.com/: 1715ms CPU time

https://18webdesign.com/js/scripts.js: 365ms CPU time

Unattributable: 251ms CPU time

https://18webdesign.com/js/bootstrap.bundle.min.js: 56ms CPU time

Main Thread Breakdown

Other 45% Style & Layout 34% Rendering 14% Script Evaluation 4%

Script	Total	Scripting	Parse/Compile	Party
https://18webdesign.com/	1715ms	8ms	1ms	1st
https://18webdesign.com/js/scripts.js	365ms	28ms	6ms	1st
Unattributable	251ms	7ms	0ms	1st
https://18webdesign.com/js/bootstrap.bundle.min.js	56ms	30ms	9ms	1st

HTTP Caching

Action

no-store (uncacheable)

FIX

no-store (uncacheable)

Cache-Control: no-store prevents all caching

Intentional for dynamic content, but increases server load for every page view.

Got: no-cache, no-store, must-revalidate

No ETag or Last-Modified header

Conditional requests (304 Not Modified) are not possible without validators.

Cache-Control

no-cache, no-store, must-revalidate

Directive	Value	Meaning
no-cache	—	Cache but always revalidate first
no-store	—	Never cache this response
must-revalidate	—	Must recheck with server after expiry

Server-Timing Observability

No Server-Timing header found

REVIEW

No Server-Timing header found

Server-Timing exposes backend timing breakdowns to browser DevTools (e.g., `db: 45ms; render: 120ms; cache: 2ms`). Useful for diagnosing slow pages without backend log access. Most modern frameworks (Next.js, Cloudflare Workers, Fastly) emit it automatically; absence on a managed platform usually means telemetry headers are stripped at the edge.

JavaScript Blocking

1 JS blocking issue(s) detected

REVIEW

1 JS blocking issue(s) detected

5 render-blocking <script src> tag(s) without async/defer

Each `<script src=...>` without `async`, `defer`, or `type="module"` blocks HTML parsing while the browser fetches and executes it. The block lasts the entire round-trip + execution time -- on slow networks this translates directly into LCP delay. Add `defer` (executes after parse, in source order) for scripts that interact with the DOM, or `async` (executes whenever ready) for analytics / independent scripts. Module scripts (`type="module"`) are deferred by default.

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

A+

Page Weight Budget

563 KB transferred, 21 requests

PASS

563 KB transferred, 21 requests

Page weighs 1.3 MB (563 KB transferred)

Fonts are 271 KB — consider subsetting or using system fonts

Subset fonts to include only used characters, or switch to system font stacks.

Got: 271 KB

21 HTTP requests

Estimated 0.12 g CO2 per page load

563 KB transferred

21 requests

0.12 g CO2 per page load

Fonts 270.9 KiB 48%

Images 118.0 KiB 21%

CSS 104.7 KiB 19%

JavaScript 48.8 KiB 9%

HTML 10.3 KiB 2%

Other 9.7 KiB 2%

Other 897 B 0%

0 2.4 MB 4.9 MB

Under budget

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

A+

Third-Party Impact

No third-party resources

PASS

No third-party resources

No third-party resources detected

No third-party resources detected — all resources are first-party.

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

Image Optimization

5 images, 0 KB saveable

PASS

5 images, 0 KB saveable

All images are well-optimized

5 images 118 KB

0 oversized -0 KB

2 legacy format

0 missing dimensions CLS risk

A+

Font Loading

2 fonts (271 KB)

PASS

2 fonts (271 KB)

2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

271 KB total

Render-blocking

of 2

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

fa-solid-900.woff2 woff2 swap

Size 155 KB

Load time 223 ms

Start 527 ms

Risk FOUT — text flashes from fallback to web font

Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need

fa-brands-400.woff2 woff2 swap

Size 116 KB

Load time 271 ms

Start 528 ms

Risk FOUT — text flashes from fallback to web font

Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need

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)

Fixing the unchecked items could save ~135 KB and ~270 ms

JS Bundles

5 scripts, 0 KB unused

PASS

5 scripts, 0 KB unused

https://18webdesign.com/js/scripts.js: unminified — 3 KB could be saved

0 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://18webdesign.com/js/bootstrap.bundle.min.js	22 KB	—	✓	1st
https://18webdesign.com/js/aos.js	4 KB	—	✓	1st
https://18webdesign.com/js/cookieconsent.umd.js	10 KB	—	✓	1st
https://18webdesign.com/js/cookieconsent-config.js	3 KB	—	✓	1st
https://18webdesign.com/js/scripts.js	10 KB	—	✗	1st

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 uses no-store -- correct for sensitive/dynamic content

PASS

Main HTML uses no-store -- correct for sensitive/dynamic content

Got: no-cache, no-store, must-revalidate

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).

No `ETag` or `Last-Modified` -- conditional GET not supported

Without either header, browsers can't issue conditional GETs and refresh always re-downloads the full response body even when nothing changed. Add `ETag: "<hash>"` (or `Last-Modified: <date>`) on cacheable responses; the server returns 304 Not Modified when the client's cached copy is still valid, saving bandwidth.

A+

Page Weight Inventory

21 resources · 563 KB · 0 KB savings available

PASS

21 resources · 563 KB · 0 KB savings available

Within 1MB page-weight target

Got: 563 KB

1 third-party resources (0% of weight)

21 resources · 563.3 KiB · 1 third-party Within 1MB page-weight target

Font 48% · 270.9 KiB

Image 23% · 127.7 KiB

CSS 19% · 104.7 KiB

JavaScript 9% · 48.8 KiB

Document 2% · 10.3 KiB

Other 0% · 897 B

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

21 resources			563.3 KiB

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

CSS Performance Depth

1 CSS depth issue(s) detected

PASS

1 CSS depth issue(s) detected

5 render-blocking stylesheet(s) -- recommended: <=3

Each `<link rel="stylesheet">` without a non-blocking `media` attribute holds up the first paint. Browsers download all of them before painting any content. Consolidate into 1-2 critical-path stylesheets; defer non-critical CSS via `<link rel="stylesheet" media="print" onload="this.media='all'">` or via the loadCSS pattern; inline above-the-fold CSS in `<style>` to short-circuit the request entirely.

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

21 requests over 1422ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Image Optimization

5 images, 1 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

1 KB

1 missing dimensions 1 missing lazy loading

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