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

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.

11.40 s

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

14.93 s

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

294 ms

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

0.044

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

11.40 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.

15.01 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

9 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 (1.2 MiB of 1.2 MiB)

Third-party blocking time is low (0 ms)

98%

First-party Third-party

JS Execution Cost

Action

3350ms total JS execution

FIX

3350ms total JS execution

Unattributable: 927ms CPU time

https://padlet.net/ui/assets/vue-CASbMAcE.js: 785ms CPU time

https://padlet.net/ui/assets/window_size-hPQO1gKj....: 545ms CPU time

https://padlet.com/: 321ms CPU time

https://padlet.com/cdn-cgi/challenge-platform/scri...: 277ms CPU time

Third-party scripts: 2753ms (82% of total)

Main Thread Breakdown

Other 42% Script Evaluation 40% Style & Layout 10% Parse HTML & CSS 4%

Script	Total	Scripting	Parse/Compile	Party
Unattributable	927ms	46ms	0ms	3rd
https://padlet.net/ui/assets/vue-CASbMAcE.js	785ms	575ms	17ms	3rd
https://padlet.net/ui/assets/window_size-hPQO1gKj.js	545ms	361ms	0ms	3rd
https://padlet.com/	321ms	83ms	12ms	1st
https://padlet.com/cdn-cgi/challenge-platform/scripts/jsd/main.js	277ms	243ms	3ms	1st
https://padlet.net/v3/modern/rdd-v3.min.js	176ms	153ms	11ms	3rd
https://padlet.net/ui/assets/LandsideCarousel-7tLcZQMj.js	103ms	66ms	1ms	3rd
https://padlet.net/ui/assets/LandsideFooterV2-D_q_o8E0.js	88ms	0ms	0ms	3rd
https://padlet.net/ui/assets/experiments-B7e83HLk.js	65ms	0ms	0ms	3rd
https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516	64ms	33ms	5ms	3rd

Page Weight Budget

1.2 MB transferred, 187 requests

REVIEW

1.2 MB transferred, 187 requests

Page weighs 3.1 MB (1.2 MB transferred)

JavaScript is 806 KB — consider code splitting or lazy loading

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

Got: 806 KB

187 HTTP requests — consider bundling or reducing

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

Estimated 0.26 g CO2 per page load

1.2 MB transferred

187 requests

0.26 g CO2 per page load

JavaScript 806.3 KiB 63%

Images 298.5 KiB 23%

CSS 71.1 KiB 6%

Fonts 70.0 KiB 5%

Other 11.5 KiB 1%

HTML 9.5 KiB 1%

Other 5.8 KiB 0%

Other 783 B 0%

Other 0 B 0%

0 2.4 MB 4.9 MB

Under budget

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 Bundles

Action

132 scripts, 169 KB unused

REVIEW

132 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 (54%)

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 (54%)	✓	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

Page Weight Inventory

Action

187 resources · 1.2 MB · 169 KB savings available

REVIEW

187 resources · 1.2 MB · 169 KB savings available

Page weight 249 KB over 1MB target

Got: 1.2 MB Expected: ≤ 1 MB

~169 KB of savings available

178 third-party resources (98% of weight)

187 resources · 1.2 MiB · 178 third-party 249.5 KiB over 1MB target

JavaScript 63% · 806.3 KiB

Image 25% · 312.6 KiB

CSS 6% · 71.1 KiB

Font 5% · 70.0 KiB

Document 1% · 9.5 KiB

Other 0% · 4.1 KiB

~168.6 KiB of savings available

Remove unused JavaScript: 168.6 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

187 resources			1.2 MiB

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

20 images, 0 KB saveable

PASS

20 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.

20 images 299 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 192 ms

Risk FOUT — text flashes from fallback to web font

LilitaOne-Regular.ttf ttf swap

Size 15 KB

Load time 17 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

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+

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

187 requests over 1757ms

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 2753ms · 160KB · $37/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
Unattributable Unattributable	Other	927ms	0 KB	—	$12/mo	Costly
padlet.net padlet.net	Other	785ms	105 KB	54%	$10/mo	Costly
padlet.net padlet.net	Other	545ms	2 KB	—	$7/mo	Costly
padlet.net padlet.net	Other	176ms	31 KB	—	$2/mo	Optional
padlet.net padlet.net	Other	103ms	4 KB	—	$1/mo	Optional
padlet.net padlet.net	Other	88ms	6 KB	—	$1/mo	Optional
padlet.net padlet.net	Other	65ms	1 KB	—	$1/mo	Optional
static.cloudflareinsights.com static.cloudflareinsights.com	Other	64ms	11 KB	—	$1/mo	Optional

Unattributable

Other

Costly

Execution 927ms

Transfer 0 KB

Monthly Cost $12/mo

padlet.net

Other

Costly

Execution 785ms

Transfer 105 KB

Unused 54%

Monthly Cost $10/mo

padlet.net

Other

Costly

Execution 545ms

Transfer 2 KB

Monthly Cost $7/mo

padlet.net

Other

Optional

Execution 176ms

Transfer 31 KB

Monthly Cost $2/mo

padlet.net

Other

Optional

Execution 103ms

Transfer 4 KB

Monthly Cost $1/mo

padlet.net

Other

Optional

Execution 88ms

Transfer 6 KB

Monthly Cost $1/mo

padlet.net

Other

Optional

Execution 65ms

Transfer 1 KB

Monthly Cost $1/mo

static.cloudflareinsights.com

Other

Optional

Execution 64ms

Transfer 11 KB

Monthly Cost $1/mo

These scripts may cost more than they're worth

Unattributable adds 927ms and costs ~$12/month
padlet.net adds 785ms and costs ~$10/month
padlet.net adds 545ms and costs ~$7/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 927ms 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

padlet.net takes 785ms 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

54% 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

padlet.net takes 545ms 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.