Performance

· 23 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

SEO

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

1.45 s

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

1.59 s

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

0 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.

1.57 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.

1.59 s

Page Load Progression

562 ms

1.1 s

1.7 s

2.2 s

2.8 s

3.4 s

3.9 s

4.5 s

Checks

16 PASS 2 REVIEW 1 FIX

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: private, no-cache, no-store, max-age=0, must-revalidate

No ETag or Last-Modified header

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

Cache-Control

private, no-cache, no-store, max-age=0, must-revalidate

Directive	Value	Meaning
private	—	Only browser cache, not CDN/proxy
no-cache	—	Cache but always revalidate first
no-store	—	Never cache this response
max-age	0	Cache for 0 seconds
must-revalidate	—	Must recheck with server after expiry

JS Bundles

12 scripts, 93 KB unused

REVIEW

12 scripts, 93 KB unused

https://www.googletagmanager.com/gtag/js?id=G-YE5H...: 72 KB unused (42%)

Consider code splitting or tree shaking to reduce unused code.

https://balford.net/_next/static/chunks/1255-73c62...: 21 KB unused (46%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 93 KB

93 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://www.googletagmanager.com/gtag/js?id=G-YE5HTNWY08	171 KB	72 KB (42%)	✓	3rd
https://balford.net/_next/static/chunks/1255-73c62fd077d3c0f5.js	46 KB	21 KB (46%)	✓	1st
https://balford.net/_next/static/chunks/webpack-96e481adf0ade2ca.js	2 KB	—	✓	1st
https://balford.net/_next/static/chunks/4bd1b696-f785427dddbba9fb.js	54 KB	—	✓	1st
https://balford.net/_next/static/chunks/main-app-12169172f6dfbe91.js	1 KB	—	✓	1st
https://balford.net/_next/static/chunks/3505-a8bf8a07e1679497.js	3 KB	—	✓	1st
https://balford.net/_next/static/chunks/app/layout-b264ae667e4a369c.js	7 KB	—	✓	1st
https://balford.net/_next/static/chunks/app/not-found-c1c528898c9b7f01.js	2 KB	—	✓	1st
https://balford.net/_next/static/chunks/app/page-5d333636d659f71f.js	1 KB	—	✓	1st
https://balford.net/cdn-cgi/challenge-platform/h/g/scripts/jsd/330e41bb475c/main.js?	10 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

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.

Page Weight Budget

957 KB transferred, 34 requests

PASS

957 KB transferred, 34 requests

Page weighs 2.0 MB (957 KB transferred)

34 HTTP requests

Estimated 0.20 g CO2 per page load

957 KB transferred

34 requests

0.20 g CO2 per page load

Images 490.3 KiB 51%

JavaScript 308.0 KiB 32%

CSS 93.8 KiB 10%

HTML 38.7 KiB 4%

Fonts 23.4 KiB 2%

Other 1.6 KiB 0%

Other 1.1 KiB 0%

Other 546 B 0%

0 2.4 MB 4.9 MB

Under budget

A+

Third-Party Impact

18% third-party, 0 ms blocking

PASS

18% third-party, 0 ms blocking

Third-party code accounts for 18% of page weight (171.7 KiB of 957.3 KiB)

Third-party blocking time is low (0 ms)

82%

18%

First-party Third-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

https://balford.net/media/2024/07/solenoid-valve-h... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://balford.net/media/2026/07/balford-home-pag... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

5 images 490 KB

0 oversized -0 KB

1 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

A+

JS Execution Cost

458ms total JS execution

PASS

458ms total JS execution

https://balford.net/: 199ms CPU time

Unattributable: 75ms CPU time

https://balford.net/_next/static/chunks/1255-73c62...: 67ms CPU time

https://www.googletagmanager.com/gtag/js?id=G-YE5H...: 59ms CPU time

https://balford.net/cdn-cgi/challenge-platform/scr...: 58ms CPU time

Third-party scripts: 59ms (13% of total)

Main Thread Breakdown

Script Evaluation 37% Other 28% Style & Layout 19% Rendering 6% Script Parsing & Compilation 5%

Script	Total	Scripting	Parse/Compile	Party
https://balford.net/	199ms	12ms	6ms	1st
Unattributable	75ms	2ms	0ms	1st
https://balford.net/_next/static/chunks/1255-73c62fd077d3c0f5.js	67ms	42ms	4ms	1st
https://www.googletagmanager.com/gtag/js?id=G-YE5HTNWY08	59ms	47ms	9ms	3rd
https://balford.net/cdn-cgi/challenge-platform/scripts/jsd/main.js	58ms	54ms	0ms	1st

A+

Font Loading

3 fonts (23 KB)

PASS

3 fonts (23 KB)

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

Web fonts

23 KB total

Render-blocking

of 3

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

roboto-condensed-v27-la... woff2 swap

Size 21 KB

Load time 330 ms

Start 910 ms

Risk FOUT — text flashes from fallback to web font

roboto-condensed-v27-la... woff2 swap

Size 1 KB

Load time 587 ms

Start 1.3 s

Risk FOUT — text flashes from fallback to web font

roboto-condensed-v27-la... woff2 swap

Size 1 KB

Load time 339 ms

Start 1.8 s

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

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: private, no-cache, no-store, max-age=0, must-revalidate

A+

Server Response Intelligence

2 server-response signal(s) detected

PASS

2 server-response signal(s) detected

`Vary` header declared: rsc, next-router-state-tree, next-router-prefetch, next-router-segment-prefetch,...

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

34 resources · 957 KB · 93 KB savings available

PASS

34 resources · 957 KB · 93 KB savings available

Within 1MB page-weight target

Got: 957 KB

~93 KB of savings available

3 third-party resources (18% of weight)

34 resources · 957.3 KiB · 3 third-party Within 1MB page-weight target

Image 51% · 491.7 KiB

JavaScript 32% · 308.0 KiB

CSS 10% · 93.8 KiB

Document 4% · 38.7 KiB

Font 2% · 23.4 KiB

Other 0% · 1.8 KiB

~93.1 KiB of savings available

Remove unused JavaScript: 93.1 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

34 resources			957.3 KiB

A+

Green Hosting

Whether the site is served from green-energy infrastructure

PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

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 2189ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Third-Party Script Cost

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

INFO

13% of JavaScript execution is third-party

First-party Third-party 59ms · 171KB · €1/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
Google Tag Manager www.googletagmanager.com	Tag Manager	59ms	171 KB	42%	€1/mo	Optional

Google Tag Manager

Tag Manager

Optional

Execution 59ms

Transfer 171 KB

Unused 42%

Monthly Cost €1/mo

How third-party costs are calculated

Image Optimization

15 images, 844 KB total, 141 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

844 KB

Oversized

Wasted

141 KB

15 missing dimensions 3 missing lazy loading

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