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.

1.15 s

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

1.27 s

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

121 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.926

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

1.15 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.

2.93 s

Page Load Progression

430 ms

861 ms

1.3 s

1.7 s

2.2 s

2.6 s

3.0 s

3.4 s

Checks

17 PASS 5 REVIEW 1 FIX

Third-Party Impact

Action

67% third-party, 0 ms blocking

FIX

67% third-party, 0 ms blocking

Third-party code accounts for 67% of page weight (177.7 KiB of 267.0 KiB)

Third-party blocking time is low (0 ms)

33%

67%

First-party Third-party

JS Execution Cost

Action

1684ms total JS execution

REVIEW

1684ms total JS execution

https://zorlya.com/: 1254ms CPU time

https://www.googletagmanager.com/gtag/js?id=G-T3TS...: 282ms CPU time

Unattributable: 148ms CPU time

Third-party scripts: 282ms (17% of total)

Main Thread Breakdown

Other 30% Rendering 26% Style & Layout 20% Script Evaluation 16% Parse HTML & CSS 4%

Script	Total	Scripting	Parse/Compile	Party
https://zorlya.com/	1254ms	16ms	2ms	1st
https://www.googletagmanager.com/gtag/js?id=G-T3TS73ZE34	282ms	221ms	44ms	3rd
Unattributable	148ms	16ms	0ms	1st

JS Bundles

6 scripts, 74 KB unused

REVIEW

6 scripts, 74 KB unused

https://www.googletagmanager.com/gtag/js?id=G-T3TS...: 74 KB unused (42%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 74 KB

74 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://www.googletagmanager.com/gtag/js?id=G-T3TS73ZE34	177 KB	74 KB (42%)	✓	3rd
https://zorlya.com/_astro/ThemeSwitch.astro_astro_type_script_index_0_lang.fie_U6yy.js	1 KB	—	✓	1st
https://zorlya.com/_astro/SiteHeader.astro_astro_type_script_index_0_lang.GNu74odx.js	1 KB	—	✓	1st
https://zorlya.com/_astro/SiteHeader.astro_astro_type_script_index_1_lang.DFOgMcTo.js	1 KB	—	✓	1st
https://zorlya.com/_astro/Site.astro_astro_type_script_index_0_lang.czNW5oLp.js	3 KB	—	✓	1st
https://zorlya.com/_astro/index.astro_astro_type_script_index_0_lang.BFRYtOpN.js	6 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

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.

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

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+

Page Weight Budget

267 KB transferred, 14 requests

PASS

267 KB transferred, 14 requests

Page weighs 775 KB (267 KB transferred)

14 HTTP requests

Estimated 0.05 g CO2 per page load

267 KB transferred

14 requests

0.05 g CO2 per page load

JavaScript 187.9 KiB 70%

HTML 42.1 KiB 16%

Fonts 18.2 KiB 7%

Other 9.6 KiB 4%

Images 6.9 KiB 3%

Other 1.8 KiB 1%

Other 544 B 0%

0 2.4 MB 4.9 MB

Under budget

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

Image Optimization

2 images, 0 KB saveable

PASS

2 images, 0 KB saveable

All images are well-optimized

2 images 7 KB

0 oversized -0 KB

2 legacy format

0 missing dimensions CLS risk

A+

Font Loading

1 fonts (18 KB)

PASS

1 fonts (18 KB)

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

Web fonts

18 KB total

Render-blocking

of 1

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

Zorlya-Brand.DDAbj3c9.w... woff2 swap

Size 18 KB

Load time 67 ms

Start 114 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+

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

1 hints, 0 missing preconnects

PASS

1 hints, 0 missing preconnects

Page uses 1 resource hint(s)

Current Resource Hints

preconnect

—

preload

dns-prefetch

—

prefetch

—

1 resource hints configured

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, max-age=0, must-revalidate

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.

Page Weight Inventory

14 resources · 267 KB · 74 KB savings available

PASS

14 resources · 267 KB · 74 KB savings available

Within 1MB page-weight target

Got: 267 KB

~74 KB of savings available

2 third-party resources (67% of weight)

14 resources · 267.0 KiB · 2 third-party Within 1MB page-weight target

JavaScript 70% · 187.9 KiB

Document 16% · 42.1 KiB

Font 7% · 18.2 KiB

Image 6% · 16.5 KiB

Other 1% · 2.3 KiB

~73.6 KiB of savings available

Remove unused JavaScript: 73.6 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

14 resources			267.0 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

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

CSS Performance Depth

1 CSS depth issue(s) detected

PASS

1 CSS depth issue(s) detected

3 `@font-face` rule(s) without `font-display` -- causes FOIT

An `@font-face` rule without `font-display` causes Flash of Invisible Text (FOIT): the browser hides the styled text for up to 3 seconds while the custom font downloads, then either swaps to fallback (Chrome / Firefox) or stays invisible (older Safari). Add `font-display: swap` (shows fallback immediately, swaps in the custom font when ready) or `font-display: optional` (uses fallback if the font isn't ready in 100ms; never causes visible swap). Either eliminates FOIT outright.

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

14 requests over 1131ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Third-Party Script Cost

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

INFO

17% of JavaScript execution is third-party

First-party Third-party 282ms · 177KB · €3/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
Google Tag Manager www.googletagmanager.com	Tag Manager	282ms	177 KB	42%	€3/mo	Costly

Google Tag Manager

Tag Manager

Costly

Execution 282ms

Transfer 177 KB

Unused 42%

Monthly Cost €3/mo

These scripts may cost more than they're worth

Google Tag Manager adds 282ms and costs ~€3/month

Google Tag Manager takes 282ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

How third-party costs are calculated

Image Optimization

4 images, 12 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

12 KB

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.