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

SEO

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

973 ms

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

2.56 s

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

13 ms

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

0.104

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

987 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

2.56 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

7 PASS 2 REVIEW 4 FIX

Page Weight Budget

Action

2.5 MB transferred, 32 requests

FIX

2.5 MB transferred, 32 requests

Page weighs 2.5 MB (2.5 MB transferred)

JavaScript is 1.5 MB — consider code splitting or lazy loading

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

Got: 1.5 MB

CSS is 556 KB — consider purging unused styles

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Got: 556 KB

32 HTTP requests

Estimated 0.53 g CO2 per page load

2.5 MB transferred

32 requests

0.53 g CO2 per page load

JavaScript 1.5 MiB 61%

CSS 555.8 KiB 21%

Images 273.2 KiB 11%

Fonts 123.2 KiB 5%

HTML 49.5 KiB 2%

Other 12.0 KiB 0%

Other 5.7 KiB 0%

Other 4.9 KiB 0%

0 2.4 MB 4.9 MB

Over 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

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

Source: web.dev

JS Bundles

Action

7 scripts, 1.1 MB unused

FIX

7 scripts, 1.1 MB unused

https://openwrt.org/lib/exe/js.php?t=bootstrap3&ts...: 870 KB unused (71%)

Consider code splitting or tree shaking to reduce unused code.

https://openwrt.org/lib/exe/jquery.php?tseed=f0349...: 258 KB unused (77%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 1.1 MB

1128 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://openwrt.org/lib/exe/js.php?t=bootstrap3&tseed=3267d969d225a35adbb1c1b9275a164e	1223 KB	870 KB (71%)	✓	1st
https://openwrt.org/lib/exe/jquery.php?tseed=f0349b609f9b91a485af8fd8ecd4aea4	337 KB	258 KB (77%)	✓	1st
https://openwrt.org/.within.website/x/cmd/anubis/static/js/main.mjs?cacheBuster=1.22.0-20250926	6 KB	—	✓	1st
https://openwrt.org/.within.website/x/cmd/anubis/static/js/worker/sha256-webcrypto.mjs?cacheBuster=1.22.0-20250926	0 KB	—	✓	1st
https://openwrt.org/.within.website/x/cmd/anubis/static/js/worker/sha256-webcrypto.mjs?cacheBuster=1.22.0-20250926	0 KB	—	✓	1st
https://openwrt.github.io/toh/toh.js?v11	4 KB	—	✓	3rd
https://openwrt.org/lib/tpl/bootstrap3/iconify.php?prefix=mdi&icons=magnify,wrench,account,toolbox,file-document-outline,flag,home,view-list,calendar,chevron-up,folder-open,folder,chevron-down	3 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

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

32 resources · 2.5 MB · 1.1 MB savings available

FIX

32 resources · 2.5 MB · 1.1 MB savings available

Page weight 1.5 MB over 1MB target

Got: 2.5 MB Expected: ≤ 1 MB

~1.1 MB of savings available

4 third-party resources (5% of weight)

3 resources over 200KB

32 resources · 2.5 MiB · 4 third-party 1.5 MiB over 1MB target

JavaScript 61% · 1.5 MiB

CSS 21% · 555.8 KiB

Image 11% · 284.7 KiB

Font 5% · 123.2 KiB

Document 2% · 55.0 KiB

Other 0% · 5.7 KiB

~1.1 MiB of savings available

Remove unused JavaScript: 1.1 MiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

32 resources			2.5 MiB

HTTP Caching

Action

no-store (uncacheable)

FIX

no-store (uncacheable)

Cache-Control: no-store prevents all caching

Intentional for dynamic content, but increases server load for every page view.

Got: no-store

No ETag or Last-Modified header

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

Cache-Control

no-store

Directive	Value	Meaning
no-store	—	Never cache this response

Image Optimization

Action

10 images, 0 KB saveable

REVIEW

10 images, 0 KB saveable

https://openwrt.org/_media/logo.png is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://openwrt.org/_media/inbox/toh/openwrt/openw... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

10 images 273 KB

0 oversized -0 KB

8 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

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

A+

Third-Party Impact

5% third-party, 0 ms blocking

PASS

5% third-party, 0 ms blocking

Third-party code accounts for 5% of page weight (127.5 KiB of 2.5 MiB)

Third-party blocking time is low (0 ms)

95%

First-party Third-party

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

A+

JS Execution Cost

271ms total JS execution

PASS

271ms total JS execution

https://openwrt.org/: 73ms CPU time

https://openwrt.org/lib/exe/jquery.php?tseed=f0349...: 73ms CPU time

https://openwrt.org/lib/exe/js.php?t=bootstrap3&ts...: 65ms CPU time

Unattributable: 60ms CPU time

Third-party scripts: 60ms (22% of total)

Main Thread Breakdown

Script Evaluation 33% Other 25% Style & Layout 17% Script Parsing & Compilation 13% Parse HTML & CSS 5% Rendering 5%

Script	Total	Scripting	Parse/Compile	Party
https://openwrt.org/	73ms	1ms	1ms	1st
https://openwrt.org/lib/exe/jquery.php?tseed=f0349b609f9b91a485af8fd8ecd4aea4	73ms	51ms	7ms	1st
https://openwrt.org/lib/exe/js.php?t=bootstrap3&tseed=3267d969d225a35adbb1c1b9275a164e	65ms	33ms	30ms	1st
Unattributable	60ms	2ms	0ms	3rd

A+

Font Loading

3 fonts (123 KB)

PASS

3 fonts (123 KB)

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

Web fonts

123 KB total

Render-blocking

of 3

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

woff2;base64,d09GMgABAA... woff2 swap

Size 59 KB

Load time 17 ms

Start 364 ms

Risk FOUT — text flashes from fallback to web font

woff2;base64,d09GMgABAA... woff2 swap

Size 63 KB

Load time 20 ms

Start 364 ms

Risk FOUT — text flashes from fallback to web font

x-font-ttf;charset=utf-... unknown swap

Size 1 KB

Load time 26 ms

Start 937 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

No optimization needed

PASS

No optimization needed

No resource hint issues

Network Waterfall

32 requests over 2337ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Third-Party Script Cost

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

INFO

22% of JavaScript execution is third-party

First-party Third-party 60ms · 0KB · $1/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
Unattributable Unattributable	Other	60ms	0 KB	—	$1/mo	Optional

Unattributable

Other

Optional

Execution 60ms

Transfer 0 KB

Monthly Cost $1/mo

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.

Browse & Analyze

Learn

Performance

Page Load Progression

Green Hosting

Font loading timeline

Optimization checklist