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

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.

2.05 s

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

4.98 s

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

176 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.

4.55 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.

4.99 s

Page Load Progression

524 ms

1.0 s

1.6 s

2.1 s

2.6 s

3.1 s

3.7 s

4.2 s

Checks

19 PASS 4 REVIEW

JS Execution Cost

Action

1137ms total JS execution

REVIEW

1137ms total JS execution

https://aicost.tools/: 377ms CPU time

https://www.googletagmanager.com/gtag/js?id=G-FN9H...: 298ms CPU time

https://earlylaunch.co/widget/1e211b2b-5d2d-400f-8...: 297ms CPU time

Unattributable: 166ms CPU time

Third-party scripts: 595ms (52% of total)

Main Thread Breakdown

Style & Layout 38% Other 26% Script Evaluation 24% Script Parsing & Compilation 5% Rendering 5%

Script	Total	Scripting	Parse/Compile	Party
https://aicost.tools/	377ms	14ms	6ms	1st
https://www.googletagmanager.com/gtag/js?id=G-FN9H4RKMSJ	298ms	235ms	54ms	3rd
https://earlylaunch.co/widget/1e211b2b-5d2d-400f-898a-32c44314c7fb/script.js	297ms	4ms	1ms	3rd
Unattributable	166ms	13ms	0ms	1st

JS Bundles

4 scripts, 74 KB unused

REVIEW

4 scripts, 74 KB unused

https://www.googletagmanager.com/gtag/js?id=G-FN9H...: 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-FN9H4RKMSJ	177 KB	74 KB (42%)	✓	3rd
https://aicost.tools/_astro/SearchModal.astro_astro_type_script_index_0_lang.C3j1IxmM.js	2 KB	—	✓	1st
https://earlylaunch.co/widget/1e211b2b-5d2d-400f-898a-32c44314c7fb/script.js	2 KB	—	✓	3rd
https://aicost.tools/_astro/engine.B1YIArAN.js	1 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.

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

547 KB transferred, 16 requests

PASS

547 KB transferred, 16 requests

Page weighs 1.0 MB (547 KB transferred)

Fonts are 326 KB — consider subsetting or using system fonts

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

Got: 326 KB

16 HTTP requests

Estimated 0.11 g CO2 per page load

547 KB transferred

16 requests

0.11 g CO2 per page load

Fonts 325.6 KiB 60%

JavaScript 183.0 KiB 33%

HTML 17.6 KiB 3%

CSS 11.6 KiB 2%

Other 6.3 KiB 1%

Images 1.3 KiB 0%

Other 789 B 0%

Other 545 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

Third-Party Impact

33% third-party, 0 ms blocking

PASS

33% third-party, 0 ms blocking

Third-party code accounts for 33% of page weight (181.4 KiB of 546.8 KiB)

Third-party blocking time is low (0 ms)

67%

33%

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

2 images, 0 KB saveable

PASS

2 images, 0 KB saveable

is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

2 images 1 KB

0 oversized -0 KB

1 legacy format

1 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

A+

Font Loading

4 fonts (326 KB)

PASS

4 fonts (326 KB)

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

Web fonts

326 KB total

Render-blocking

of 4

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

fraunces-normal-latin.w... woff2 swap

Size 119 KB

Load time 104 ms

Start 197 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

fraunces-italic-latin.w... woff2 swap

Size 147 KB

Load time 174 ms

Start 198 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

jetbrainsmono-normal-la... woff2 swap

Size 31 KB

Load time 126 ms

Start 199 ms

Risk FOUT — text flashes from fallback to web font

geist-normal-latin.woff2 woff2 swap

Size 29 KB

Load time 91 ms

Start 446 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)

Fixing the unchecked items could save ~133 KB and ~266 ms

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

3 hints, 0 missing preconnects

PASS

3 hints, 0 missing preconnects

Page uses 3 resource hint(s)

Current Resource Hints

preconnect

—

preload

dns-prefetch

—

prefetch

—

3 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

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

16 resources · 547 KB · 74 KB savings available

PASS

16 resources · 547 KB · 74 KB savings available

Within 1MB page-weight target

Got: 547 KB

~74 KB of savings available

4 third-party resources (33% of weight)

16 resources · 546.8 KiB · 4 third-party Within 1MB page-weight target

Font 60% · 325.6 KiB

JavaScript 33% · 183.0 KiB

Document 3% · 17.6 KiB

CSS 2% · 11.6 KiB

Image 1% · 7.6 KiB

Other 0% · 1.3 KiB

~73.5 KiB of savings available

Remove unused JavaScript: 73.5 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

16 resources			546.8 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

A+

CSS Performance Depth

No CSS performance depth issues detected

PASS

No CSS performance depth issues detected

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

16 requests over 676ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Third-Party Script Cost

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

INFO

52% of JavaScript execution is third-party

First-party Third-party 595ms · 180KB · €6/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
Google Tag Manager www.googletagmanager.com	Tag Manager	298ms	177 KB	42%	€3/mo	Costly
earlylaunch.co earlylaunch.co	Other	297ms	2 KB	—	€3/mo	Costly

Google Tag Manager

Tag Manager

Costly

Execution 298ms

Transfer 177 KB

Unused 42%

Monthly Cost €3/mo

earlylaunch.co

Other

Costly

Execution 297ms

Transfer 2 KB

Monthly Cost €3/mo

These scripts may cost more than they're worth

Google Tag Manager adds 298ms and costs ~€3/month
earlylaunch.co adds 297ms and costs ~€3/month

52% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

Google Tag Manager takes 298ms 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

earlylaunch.co takes 297ms 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

144 images, 0 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

144

Total Size

0 KB

34 missing dimensions 2 missing lazy loading

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