Performance

· 14 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.

2.01 s

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

4.07 s

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

238 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.

4.21 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.

4.11 s

Page Load Progression

375 ms

750 ms

1.1 s

1.5 s

1.9 s

2.2 s

2.6 s

3.0 s

Checks

6 PASS 6 REVIEW

Third-Party Impact

46% third-party, 0 ms blocking

REVIEW

46% third-party, 0 ms blocking

Third-party code accounts for 46% of page weight (195.4 KiB of 427.6 KiB)

Third-party blocking time is low (0 ms)

54%

46%

First-party Third-party

Image Optimization

Action

23 images, 0 KB saveable

REVIEW

23 images, 0 KB saveable

https://www.smashingmagazine.com/images/smashing-c... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://www.smashingmagazine.com/images/logo.svg is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

23 images 61 KB

0 oversized -0 KB

12 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

JS Execution Cost

Action

1360ms total JS execution

REVIEW

1360ms total JS execution

https://www.smashingmagazine.com/: 883ms CPU time

Unattributable: 265ms CPU time

https://www.googletagmanager.com/gtag/js?id=G-CXX3...: 212ms CPU time

Third-party scripts: 477ms (35% of total)

Main Thread Breakdown

Style & Layout 48% Other 22% Script Evaluation 16% Parse HTML & CSS 6% Script Parsing & Compilation 5% Rendering 3%

Script	Total	Scripting	Parse/Compile	Party
https://www.smashingmagazine.com/	883ms	49ms	23ms	1st
Unattributable	265ms	13ms	0ms	3rd
https://www.googletagmanager.com/gtag/js?id=G-CXX395KXNG	212ms	150ms	51ms	3rd

JS Bundles

3 scripts, 84 KB unused

REVIEW

3 scripts, 84 KB unused

https://www.googletagmanager.com/gtag/js?id=G-CXX3...: 84 KB unused (56%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 84 KB

84 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://www.googletagmanager.com/gtag/js?id=G-CXX395KXNG	149 KB	84 KB (56%)	✓	3rd
https://www.smashingmagazine.com/js/nav-v2.js	1 KB	—	✓	1st
https://www.smashingmagazine.com/.netlify/scripts/rum	4 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

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

HTTP Caching

No-Cache

REVIEW

No-Cache

Cache-Control header is set

Got: No-Cache

ETag present — enables conditional (304) responses

Cache-Control

No-Cache

Directive	Value	Meaning
no-cache	—	Cache but always revalidate first

A+

Page Weight Budget

428 KB transferred, 41 requests

PASS

428 KB transferred, 41 requests

Page weighs 1.3 MB (428 KB transferred)

41 HTTP requests

Estimated 0.09 g CO2 per page load

428 KB transferred

41 requests

0.09 g CO2 per page load

JavaScript 154.1 KiB 36%

HTML 74.4 KiB 17%

CSS 71.3 KiB 17%

Fonts 64.9 KiB 15%

Images 60.7 KiB 14%

Other 1.9 KiB 0%

Other 371 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.

A+

Font Loading

4 fonts (65 KB)

PASS

4 fonts (65 KB)

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

Web fonts

65 KB total

Render-blocking

of 4

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

ElenaWebRegular-subset-... woff2 swap

Size 17 KB

Load time 0 ms

Start 0 ms

Risk FOUT — text flashes from fallback to web font

ElenaWebBold-subset-v2.... woff2 swap

Size 17 KB

Load time 0 ms

Start 0 ms

Risk FOUT — text flashes from fallback to web font

Mija_Bold-webfont-subse... woff2 swap

Size 14 KB

Load time 0 ms

Start 0 ms

Risk FOUT — text flashes from fallback to web font

ElenaWebRegularItalic-s... woff2 swap

Size 17 KB

Load time 0 ms

Start 0 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

9 hints, 0 missing preconnects

PASS

9 hints, 0 missing preconnects

Page uses 9 resource hint(s)

Current Resource Hints

preconnect

preload

dns-prefetch

—

prefetch

—

9 resource hints configured

Network Waterfall

41 requests over 0ms

INFO

Performance analysis not available for this result.

Third-Party Script Cost

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

INFO

35% of JavaScript execution is third-party

First-party Third-party 477ms · 149KB · €5/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
Unattributable Unattributable	Other	265ms	0 KB	—	€3/mo	Costly
Google Tag Manager www.googletagmanager.com	Tag Manager	212ms	149 KB	56%	€2/mo	Costly

Unattributable

Other

Costly

Execution 265ms

Transfer 0 KB

Monthly Cost €3/mo

Google Tag Manager

Tag Manager

Costly

Execution 212ms

Transfer 149 KB

Unused 56%

Monthly Cost €2/mo

These scripts may cost more than they're worth

Unattributable adds 265ms and costs ~€3/month
Google Tag Manager adds 212ms and costs ~€2/month

Unattributable takes 265ms 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

Google Tag Manager takes 212ms 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

56% of Google Tag Manager's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

How third-party costs are calculated

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