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Contrast Checker

Check WCAG color contrast ratios between any two colors

Inspect HTTP response headers for any URL

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https://fimmer.com

Performance

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

SCORE

82

GRADE

B

FIX

3

REVIEW

6

PASS

10

INFO

3

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

99

Performance

92

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.

344 ms

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

924 ms

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.

735 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.

926 ms

Page Load Progression

502 ms

1.0 s

1.5 s

2.0 s

2.5 s

3.0 s

3.5 s

4.0 s

Checks

22

10 PASS 6 REVIEW 3 FIX

F

Page Weight Budget

Action

3.0 MB transferred, 94 requests

FIX

3.0 MB transferred, 94 requests

Page weighs 4.6 MB (3.0 MB transferred)

94 HTTP requests

Estimated 0.62 g CO2 per page load

3.0 MB transferred

94 requests

0.62 g CO2 per page load

Other 2.3 MiB 78%

Images 465.2 KiB 15%

JavaScript 102.9 KiB 3%

CSS 34.1 KiB 1%

Fonts 28.9 KiB 1%

HTML 20.3 KiB 1%

Other 14.3 KiB 0%

Other 1.4 KiB 0%

Other 722 B 0%

Other 0 B 0%

0 2.4 MB 4.9 MB

Over budget

D

Third-Party Impact

Action

84% third-party, 0 ms blocking

FIX

84% third-party, 0 ms blocking

Third-party code accounts for 84% of page weight (2.5 MiB of 3.0 MiB)

Third-party blocking time is low (0 ms)

16%

84%

First-party Third-party

D

Page Weight Inventory

Action

94 resources · 3.0 MB · 50 KB savings available

FIX

94 resources · 3.0 MB · 50 KB savings available

Page weight 3.0 MB exceeds 1 MB target by 2.0 MB

Got: 3.0 MB Expected: ≤ 1 MB

63 third-party resources (84% of weight)

3 resources over 200KB

94 resources · 3.0 MiB · 63 third-party 2.0 MiB over 1MB target

Media 78% · 2.3 MiB

Image 15% · 466.6 KiB

JavaScript 3% · 102.9 KiB

CSS 1% · 34.1 KiB

Font 1% · 28.9 KiB

Document 1% · 20.3 KiB

Other 0% · 15.0 KiB

~49.9 KiB of savings available

Remove unused JavaScript: 49.9 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

94 resources			3.0 MiB

C

Image Optimization

Action

61 images, 0 KB saveable

REVIEW

61 images, 0 KB saveable

https://fimmer.com/hero-nasdaq.svg is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://fimmer.com/hero-tsx.svg is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://fimmer.com/hero-nyse.svg is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://fimmer.com/hero-lseg.svg is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://fimmer.com/hero-us.svg is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://fimmer.com/hero-asx.svg is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://fimmer.com/hero-hkex.svg is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://fimmer.com/hero-sp.svg is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://fimmer.com/hero-yfinance.svg is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

61 images 465 KB

0 oversized -0 KB

60 legacy format

9 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

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

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

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

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

C

JS Execution Cost

Action

1923ms total JS execution

REVIEW

1923ms total JS execution

https://fimmer.com/: 949ms CPU time

Unattributable: 684ms CPU time

https://fimmer.com/_astro/popup-feature.astro_astr...: 290ms CPU time

Main Thread Breakdown

Other 32% Rendering 32% Script Evaluation 26% Style & Layout 9%

Script	Total	Scripting	Parse/Compile	Party
https://fimmer.com/	949ms	8ms	1ms	1st
Unattributable	684ms	215ms	0ms	1st
https://fimmer.com/_astro/popup-feature.astro_astro_type_script_index_0_lang.Crg9eYhy.js?dpl=dpl_CsARqymNvwahKh9fqskxHo43KTzW	290ms	277ms	0ms	1st

B

HTTP/3 (QUIC)

HTTP/3 not advertised

REVIEW

HTTP/3 not advertised

HTTP/3 (QUIC) is not advertised

HTTP/3 isn't advertised via Alt-Svc and the worker didn't negotiate h3. HTTP/3 reduces handshake latency (1-RTT instead of 2-3 RTTs) and is more resilient on lossy connections. Most modern CDNs (Cloudflare, Fastly, AWS CloudFront, Google Cloud CDN) support HTTP/3 with a single config switch -- consider enabling for mobile-heavy workloads.

B

Server-Timing Observability

No Server-Timing header found

REVIEW

No Server-Timing header found

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.

C

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

B

HTTP Caching

public, max-age=0, must-revalidate

REVIEW

public, max-age=0, must-revalidate

Cache-Control header is set

Got: public, max-age=0, must-revalidate

No ETag or Last-Modified header

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

Cache-Control

public, max-age=0, must-revalidate

Directive	Value	Meaning
public	—	Any cache may store this response
max-age	0	Cache for 0 seconds
must-revalidate	—	Must recheck with server after expiry

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are compressed

All text resources are properly compressed.

A+

Font Loading

1 fonts (29 KB)

PASS

1 fonts (29 KB)

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

Web fonts

1

29 KB total

Render-blocking

0

of 1

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

geist-latin-wght-normal... woff2 swap

Size 29 KB

Load time 62 ms

Start 571 ms

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+

JS Bundles

15 scripts, 50 KB unused

PASS

15 scripts, 50 KB unused

https://fimmer.com/_astro/functions.ggQ-D7Q0.js?dp...: 50 KB unused (82%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 50 KB

50 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://fimmer.com/_astro/functions.ggQ-D7Q0.js?dpl=dpl_CsARqymNvwahKh9fqskxHo43KTzW	61 KB	50 KB (82%)	✓	1st
https://fimmer.com/_astro/index.astro_astro_type_script_index_0_lang.D79OgKwo.js?dpl=dpl_CsARqymNvwahKh9fqskxHo43KTzW	7 KB	—	✓	1st
https://fimmer.com/_astro/popup-feature.astro_astro_type_script_index_0_lang.Crg9eYhy.js?dpl=dpl_CsARqymNvwahKh9fqskxHo43KTzW	2 KB	—	✓	1st
https://fimmer.com/_astro/popup-contact.astro_astro_type_script_index_0_lang.B0dduWy9.js?dpl=dpl_CsARqymNvwahKh9fqskxHo43KTzW	1 KB	—	✓	1st
https://fimmer.com/_astro/popup-disclaimer.astro_astro_type_script_index_0_lang.Buq-RyI8.js?dpl=dpl_CsARqymNvwahKh9fqskxHo43KTzW	1 KB	—	✓	1st
https://fimmer.com/_astro/body.astro_astro_type_script_index_0_lang.D793C1i7.js?dpl=dpl_CsARqymNvwahKh9fqskxHo43KTzW	0 KB	—	✓	1st
https://fimmer.com/_astro/popup-search.astro_astro_type_script_index_0_lang.CjXb1VfU.js?dpl=dpl_CsARqymNvwahKh9fqskxHo43KTzW	3 KB	—	✓	1st
https://fimmer.com/37ed7292e04a8dd7/script.js	2 KB	—	✓	1st
https://fimmer.com/_astro/navigation.astro_astro_type_script_index_0_lang.CGtgzcxE.js?dpl=dpl_CsARqymNvwahKh9fqskxHo43KTzW	2 KB	—	✓	1st
https://fimmer.com/_astro/consts.BuxCetVv.js?dpl=dpl_CsARqymNvwahKh9fqskxHo43KTzW	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

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+

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

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

Got: public, max-age=0, must-revalidate

A

Server Response Intelligence

2 server-response signal(s) detected

PASS

2 server-response signal(s) detected

Compressed response missing `Vary` header

The page is served with `Content-Encoding: br` but has no `Vary` header. Without `Vary: Accept-Encoding`, intermediary caches (corporate proxies, ISP caches) may serve the compressed variant to clients that didn't send the matching `Accept-Encoding` -- the client sees garbled bytes. Add `Vary: Accept-Encoding` whenever the response is conditionally compressed.

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.

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

94 requests over 1681ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Image Optimization

70 images, 588 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

70

Total Size

588 KB

Oversized

50

20 missing dimensions 68 missing lazy loading

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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