Performance

· 15 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.

775 ms

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

4.14 s

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

66 ms

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

0.056

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

2.29 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.

4.14 s

Page Load Progression

489 ms

978 ms

1.5 s

2.0 s

2.4 s

2.9 s

3.4 s

3.9 s

Checks

7 PASS 4 REVIEW 2 FIX

Third-Party Impact

Action

98% third-party, 0 ms blocking

FIX

98% third-party, 0 ms blocking

Third-party code accounts for 98% of page weight (1.9 MiB of 1.9 MiB)

Third-party blocking time is low (0 ms)

98%

First-party Third-party

Page Weight Inventory

Action

182 resources · 1.9 MB · 169 KB savings available

FIX

182 resources · 1.9 MB · 169 KB savings available

Page weight 973 KB over 1MB target

Got: 1.9 MB Expected: ≤ 1 MB

~169 KB of savings available

173 third-party resources (98% of weight)

2 resources over 200KB

182 resources · 1.9 MiB · 173 third-party 972.7 KiB over 1MB target

Other 41% · 813.5 KiB

JavaScript 36% · 720.3 KiB

Image 16% · 312.4 KiB

CSS 4% · 71.0 KiB

Font 4% · 70.0 KiB

Document 0% · 9.4 KiB

~169.0 KiB of savings available

Remove unused JavaScript: 169.0 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

182 resources			1.9 MiB

Page Weight Budget

Action

1.9 MB transferred, 182 requests

REVIEW

1.9 MB transferred, 182 requests

Page weighs 4.7 MB (1.9 MB transferred)

JavaScript is 720 KB — consider code splitting or lazy loading

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Got: 720 KB

182 HTTP requests — consider bundling or reducing

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Estimated 0.41 g CO2 per page load

1.9 MB transferred

182 requests

0.41 g CO2 per page load

Other 810.0 KiB 41%

JavaScript 720.3 KiB 36%

Images 299.7 KiB 15%

CSS 71.0 KiB 4%

Fonts 70.0 KiB 4%

Other 10.2 KiB 1%

HTML 9.4 KiB 0%

Other 6.0 KiB 0%

Other 0 B 0%

0 2.4 MB 4.9 MB

Approaching limit

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

JS Execution Cost

784ms total JS execution

REVIEW

784ms total JS execution

https://padlet.net/ui/assets/vue-CASbMAcE.js: 296ms CPU time

Unattributable: 273ms CPU time

https://padlet.com/: 144ms CPU time

https://padlet.com/cdn-cgi/challenge-platform/scri...: 71ms CPU time

Third-party scripts: 569ms (73% of total)

Main Thread Breakdown

Script Evaluation 43% Other 41% Style & Layout 10%

Script	Total	Scripting	Parse/Compile	Party
https://padlet.net/ui/assets/vue-CASbMAcE.js	296ms	214ms	1ms	3rd
Unattributable	273ms	59ms	0ms	3rd
https://padlet.com/	144ms	25ms	2ms	1st
https://padlet.com/cdn-cgi/challenge-platform/scripts/jsd/main.js	71ms	66ms	1ms	1st

JS Bundles

Action

133 scripts, 169 KB unused

REVIEW

133 scripts, 169 KB unused

https://padlet.net/ui/assets/surface_attachments-B...: 112 KB unused (93%)

Consider code splitting or tree shaking to reduce unused code.

https://padlet.net/ui/assets/vue-CASbMAcE.js: 57 KB unused (55%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 169 KB

169 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://padlet.net/ui/assets/surface_attachments-BxXKYV3s.js	121 KB	112 KB (93%)	✓	3rd
https://padlet.net/ui/assets/vue-CASbMAcE.js	105 KB	57 KB (55%)	✓	3rd
https://padlet.net/ui/assets/landside-D_ZLhxNu.js	18 KB	—	✓	3rd
https://padlet.net/ui/assets/intl-CbmH0QmU.js	3 KB	—	✓	3rd
https://padlet.net/ui/assets/global-DI4qb8sP.js	1 KB	—	✓	3rd
https://padlet.net/ui/assets/plans_helper-DGQrCyTG.js	11 KB	—	✓	3rd
https://padlet.net/ui/assets/_sentry-release-injection-file-Dw-Ov7wz.js	1 KB	—	✓	3rd
https://padlet.net/ui/assets/analytics-DbipJI5A.js	1 KB	—	✓	3rd
https://padlet.net/ui/assets/experiments-B7e83HLk.js	1 KB	—	✓	3rd
https://padlet.net/ui/assets/plans-CCjhQksP.js	2 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

max-age=0, private, must-revalidate

REVIEW

max-age=0, private, must-revalidate

Cache-Control header is set

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

No ETag or Last-Modified header

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

Cache-Control

max-age=0, private, must-revalidate

Directive	Value	Meaning
max-age	0	Cache for 0 seconds
private	—	Only browser cache, not CDN/proxy
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 properly compressed.

A+

Image Optimization

14 images, 0 KB saveable

PASS

14 images, 0 KB saveable

https://padlet.net/logos/padlet_crane_icon.webp is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

14 images 300 KB

0 oversized -0 KB

0 legacy format

1 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

A+

Font Loading

2 fonts (70 KB)

PASS

2 fonts (70 KB)

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

Web fonts

70 KB total

Render-blocking

of 2

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

inter-latin.woff2 woff2 swap

Size 55 KB

Load time 482 ms

Start 173 ms

Risk FOUT — text flashes from fallback to web font

LilitaOne-Regular.ttf ttf swap

Size 15 KB

Load time 21 ms

Start 1.0 s

Risk FOUT — text flashes from fallback to web font

Convert to woff2 for ~30% smaller file size

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 ~4 KB and ~8 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

No optimization needed

PASS

No optimization needed

No resource hint issues

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

182 requests over 1734ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Third-Party Script Cost

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

INFO

73% of JavaScript execution is third-party

First-party Third-party 569ms · 105KB · $8/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
padlet.net padlet.net	Other	296ms	105 KB	55%	$4/mo	Costly
Unattributable Unattributable	Other	273ms	0 KB	—	$4/mo	Costly

padlet.net

Other

Costly

Execution 296ms

Transfer 105 KB

Unused 55%

Monthly Cost $4/mo

Unattributable

Other

Costly

Execution 273ms

Transfer 0 KB

Monthly Cost $4/mo

These scripts may cost more than they're worth

padlet.net adds 296ms and costs ~$4/month
Unattributable adds 273ms and costs ~$4/month

73% 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

padlet.net takes 296ms 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

55% of padlet.net'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

Unattributable takes 273ms 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

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