Performance

· 17 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.

4.08 s

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

10.07 s

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

750 ms

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

0.008

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

5.34 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.

10.25 s

Page Load Progression

604 ms

1.2 s

1.8 s

2.4 s

3.0 s

3.6 s

4.2 s

4.8 s

Checks

10 PASS 3 REVIEW 2 FIX

Third-Party Impact

Action

97% third-party, 0 ms blocking

FIX

97% third-party, 0 ms blocking

Third-party code accounts for 97% of page weight (885.9 KiB of 915.0 KiB)

Third-party blocking time is low (0 ms)

97%

First-party Third-party

JS Execution Cost

Action

4444ms total JS execution

FIX

4444ms total JS execution

Unattributable: 1154ms CPU time

https://t.ixdf.org/gtag/js?id=G-WP2YP70Z2X&cx=c&gt...: 870ms CPU time

https://ixdf.org/: 808ms CPU time

https://t.ixdf.org/gtm.js?id=GTM-KJ8XGB: 553ms CPU time

https://assets.interaction-design.org/build/assets...: 488ms CPU time

Third-party scripts: 3636ms (82% of total)

Main Thread Breakdown

Script Evaluation 37% Other 37% Style & Layout 12% Rendering 6% Script Parsing & Compilation 4% Parse HTML & CSS 4%

Script	Total	Scripting	Parse/Compile	Party
Unattributable	1154ms	51ms	0ms	3rd
https://t.ixdf.org/gtag/js?id=G-WP2YP70Z2X&cx=c&gtm=4e64k1	870ms	749ms	93ms	3rd
https://ixdf.org/	808ms	26ms	8ms	1st
https://t.ixdf.org/gtm.js?id=GTM-KJ8XGB	553ms	468ms	78ms	3rd
https://assets.interaction-design.org/build/assets/bugsnag-1RJHgweM.js	488ms	180ms	1ms	3rd
https://assets.interaction-design.org/build/assets/app-CGlU-aIG.js	308ms	69ms	0ms	3rd
https://assets.interaction-design.org/build/assets/staggerRevealer-D9U4066z.js	106ms	6ms	0ms	3rd
https://assets.interaction-design.org/build/assets/typed.module-D-osZxX8.js	100ms	78ms	0ms	3rd
https://assets.interaction-design.org/build/assets/tailwind-DxFDGO_n.css	58ms	0ms	0ms	3rd

Image Optimization

24 images, 0 KB saveable

REVIEW

24 images, 0 KB saveable

All images are well-optimized

24 images 341 KB

0 oversized -0 KB

10 legacy format

0 missing dimensions CLS risk

JS Bundles

46 scripts, 118 KB unused

REVIEW

46 scripts, 118 KB unused

https://t.ixdf.org/gtag/js?id=G-WP2YP70Z2X&cx=c&gt...: 60 KB unused (35%)

Consider code splitting or tree shaking to reduce unused code.

https://t.ixdf.org/gtm.js?id=GTM-KJ8XGB: 58 KB unused (37%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 118 KB

118 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://t.ixdf.org/gtag/js?id=G-WP2YP70Z2X&cx=c&gtm=4e64k1	171 KB	60 KB (35%)	✓	3rd
https://t.ixdf.org/gtm.js?id=GTM-KJ8XGB	156 KB	58 KB (37%)	✓	3rd
https://assets.interaction-design.org/build/assets/course-DfCRK5qh.js	1 KB	—	✓	3rd
https://assets.interaction-design.org/build/assets/button-DU36gPX9.js	2 KB	—	✓	3rd
https://assets.interaction-design.org/build/assets/notification-f2Rm4oS7.js	2 KB	—	✓	3rd
https://assets.interaction-design.org/build/assets/spinner--AwVl_E8.js	1 KB	—	✓	3rd
https://assets.interaction-design.org/build/assets/auth-S67ULf_r.js	1 KB	—	✓	3rd
https://assets.interaction-design.org/build/assets/cookie-RmvTIN1d.js	1 KB	—	✓	3rd
https://assets.interaction-design.org/build/assets/smoothAnchor-Bdh_NRTq.js	1 KB	—	✓	3rd
https://assets.interaction-design.org/build/assets/cssVariables-Bz9wRQEm.js	1 KB	—	✓	3rd

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

HTTP Caching

no-cache, private

REVIEW

no-cache, private

Cache-Control header is set

Got: no-cache, private

No ETag or Last-Modified header

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

Cache-Control

no-cache, private

Directive	Value	Meaning
no-cache	—	Cache but always revalidate first
private	—	Only browser cache, not CDN/proxy

Page Weight Budget

915 KB transferred, 82 requests

PASS

915 KB transferred, 82 requests

Page weighs 2.7 MB (915 KB transferred)

82 HTTP requests

Estimated 0.19 g CO2 per page load

915 KB transferred

82 requests

0.19 g CO2 per page load

JavaScript 426.4 KiB 47%

Images 341.3 KiB 37%

CSS 53.7 KiB 6%

Other 39.1 KiB 4%

HTML 30.9 KiB 3%

Fonts 20.4 KiB 2%

Other 3.0 KiB 0%

Other 88 B 0%

Other 0 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

1 fonts (20 KB)

PASS

1 fonts (20 KB)

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

Web fonts

20 KB total

Render-blocking

of 1

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

arimo-normal-latin-CtqM... woff2 swap

Size 20 KB

Load time 462 ms

Start 194 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

4 hints, 0 missing preconnects

PASS

4 hints, 0 missing preconnects

Page uses 4 resource hint(s)

Current Resource Hints

preconnect

preload

—

dns-prefetch

—

prefetch

—

4 resource hints configured

Page Weight Inventory

82 resources · 915 KB · 118 KB savings available

PASS

82 resources · 915 KB · 118 KB savings available

Within 1MB page-weight target

Got: 915 KB

~118 KB of savings available

81 third-party resources (97% of weight)

82 resources · 915.0 KiB · 81 third-party Within 1MB page-weight target

JavaScript 47% · 426.4 KiB

Image 42% · 382.7 KiB

CSS 6% · 53.7 KiB

Document 3% · 30.9 KiB

Font 2% · 20.4 KiB

Other 0% · 896 B

~118.1 KiB of savings available

Remove unused JavaScript: 118.1 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

82 resources			915.0 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+

Green Hosting

Whether the site is served from green-energy infrastructure

PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall

82 requests over 2590ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Third-Party Script Cost

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

INFO

82% of JavaScript execution is third-party

First-party Third-party 3636ms · 411KB · $48/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
Unattributable Unattributable	Other	1154ms	0 KB	—	$15/mo	Costly
t.ixdf.org t.ixdf.org	Other	870ms	171 KB	35%	$12/mo	Costly
t.ixdf.org t.ixdf.org	Other	553ms	156 KB	37%	$7/mo	Costly
assets.interaction-design.org assets.interaction-design.org	Other	488ms	16 KB	—	$6/mo	Costly
assets.interaction-design.org assets.interaction-design.org	Other	308ms	10 KB	—	$4/mo	Costly
assets.interaction-design.org assets.interaction-design.org	Other	106ms	2 KB	—	$1/mo	Optional
assets.interaction-design.org assets.interaction-design.org	Other	100ms	3 KB	—	$1/mo	Optional
assets.interaction-design.org assets.interaction-design.org	Other	58ms	53 KB	—	$1/mo	Optional

Unattributable

Other

Costly

Execution 1154ms

Transfer 0 KB

Monthly Cost $15/mo

t.ixdf.org

Other

Costly

Execution 870ms

Transfer 171 KB

Unused 35%

Monthly Cost $12/mo

t.ixdf.org

Other

Costly

Execution 553ms

Transfer 156 KB

Unused 37%

Monthly Cost $7/mo

assets.interaction-design.org

Other

Costly

Execution 488ms

Transfer 16 KB

Monthly Cost $6/mo

assets.interaction-design.org

Other

Costly

Execution 308ms

Transfer 10 KB

Monthly Cost $4/mo

assets.interaction-design.org

Other

Optional

Execution 106ms

Transfer 2 KB

Monthly Cost $1/mo

assets.interaction-design.org

Other

Optional

Execution 100ms

Transfer 3 KB

Monthly Cost $1/mo

assets.interaction-design.org

Other

Optional

Execution 58ms

Transfer 53 KB

Monthly Cost $1/mo

These scripts may cost more than they're worth

Unattributable adds 1154ms and costs ~$15/month
t.ixdf.org adds 870ms and costs ~$12/month
t.ixdf.org adds 553ms and costs ~$7/month
assets.interaction-design.org adds 488ms and costs ~$6/month
assets.interaction-design.org adds 308ms and costs ~$4/month

82% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

Unattributable takes 1154ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters