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.

1.08 s

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

1.72 s

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

182 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.

1.08 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.

5.19 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

10 PASS 5 REVIEW

Third-Party Impact

57% third-party, 0 ms blocking

REVIEW

57% third-party, 0 ms blocking

Third-party code accounts for 57% of page weight (187.1 KiB of 326.9 KiB)

Third-party blocking time is low (0 ms)

43%

57%

First-party Third-party

Image Optimization

7 images, 0 KB saveable

REVIEW

7 images, 0 KB saveable

https://automattic.com/wp-content/themes/a8c/autom... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

7 images 2 KB

0 oversized -0 KB

6 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

JS Execution Cost

Action

1230ms total JS execution

REVIEW

1230ms total JS execution

https://automattic.com/: 512ms CPU time

https://www.googletagmanager.com/gtag/js?id=G-737C...: 348ms CPU time

Unattributable: 246ms CPU time

https://automattic.com/wp-content/js/bilmur.min.js...: 66ms CPU time

https://s0.wp.com/wp-content/mu-plugins/a8c-analyt...: 57ms CPU time

Third-party scripts: 652ms (53% of total)

Main Thread Breakdown

Script Evaluation 41% Other 23% Style & Layout 22% Script Parsing & Compilation 7% Parse HTML & CSS 5%

Script	Total	Scripting	Parse/Compile	Party
https://automattic.com/	512ms	80ms	11ms	1st
https://www.googletagmanager.com/gtag/js?id=G-737CYY5004	348ms	281ms	64ms	3rd
Unattributable	246ms	9ms	0ms	3rd
https://automattic.com/wp-content/js/bilmur.min.js?i=17&m=202617	66ms	43ms	6ms	1st
https://s0.wp.com/wp-content/mu-plugins/a8c-analytics/18963dab99afed0916ef.a8c-analytics.js	57ms	51ms	5ms	3rd

JS Bundles

12 scripts, 64 KB unused

REVIEW

12 scripts, 64 KB unused

https://www.googletagmanager.com/gtag/js?id=G-737C...: 64 KB unused (40%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 64 KB

64 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://www.googletagmanager.com/gtag/js?id=G-737CYY5004	160 KB	64 KB (40%)	✓	3rd
https://automattic.com/wp-content/js/rlt-proxy.js?m=1720530689i	1 KB	—	✓	1st
https://automattic.com/wp-content/themes/a8c/automattic-2011/includes/assets/js/logo-right-click.js?m=1770742792i	1 KB	—	✓	1st
https://stats.wp.com/w.js?68	5 KB	—	✓	3rd
https://automattic.com/wp-content/js/bilmur.min.js?i=17&m=202617	5 KB	—	✓	1st
https://s0.wp.com/wp-content/mu-plugins/a8c-analytics/a8c-analytics.js?v=1774373551	2 KB	—	✓	3rd
blob:https://automattic.com/a3b5abfb-c0df-435e-ad60-b482c2923a14	-0 KB	—	✓	3rd
https://automattic.com/wp-content/mu-plugins/actionbar/actionbar.js?v=20250204	3 KB	—	✓	1st
https://s0.wp.com/wp-content/mu-plugins/a8c-analytics/8de60a4730efd578190b.a8c-analytics.js	7 KB	—	✓	3rd
https://s0.wp.com/wp-content/mu-plugins/a8c-analytics/18963dab99afed0916ef.a8c-analytics.js	7 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

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

A+

Page Weight Budget

327 KB transferred, 34 requests

PASS

327 KB transferred, 34 requests

Page weighs 857 KB (327 KB transferred)

34 HTTP requests

Estimated 0.07 g CO2 per page load

327 KB transferred

34 requests

0.07 g CO2 per page load

JavaScript 199.8 KiB 61%

Fonts 78.5 KiB 24%

HTML 28.1 KiB 9%

CSS 15.5 KiB 5%

Images 2.3 KiB 1%

Other 1.0 KiB 0%

Other 1019 B 0%

Other 556 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 (79 KB)

PASS

4 fonts (79 KB)

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

Web fonts

79 KB total

Render-blocking

of 4

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

source-serif-pro-normal... woff2 swap

Size 19 KB

Load time 17 ms

Start 117 ms

Risk FOUT — text flashes from fallback to web font

source-serif-pro-normal... woff2 swap

Size 20 KB

Load time 16 ms

Start 118 ms

Risk FOUT — text flashes from fallback to web font

source-serif-pro-italic... woff2 swap

Size 20 KB

Load time 13 ms

Start 118 ms

Risk FOUT — text flashes from fallback to web font

source-serif-pro-italic... woff2 swap

Size 19 KB

Load time 17 ms

Start 118 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

Page Weight Inventory

34 resources · 327 KB · 64 KB savings available

PASS

34 resources · 327 KB · 64 KB savings available

Within 1MB page-weight target

Got: 327 KB

~64 KB of savings available

17 third-party resources (57% of weight)

34 resources · 326.9 KiB · 17 third-party Within 1MB page-weight target

JavaScript 61% · 199.8 KiB

Font 24% · 78.5 KiB

Document 9% · 28.1 KiB

CSS 5% · 15.5 KiB

Image 1% · 3.3 KiB

Other 0% · 1.6 KiB

~64.0 KiB of savings available

Remove unused JavaScript: 64.0 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

34 resources			326.9 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+

HTTP Caching

max-age=201 (3 minutes)

PASS

max-age=201 (3 minutes)

Cache-Control header is set

Got: max-age=201, must-revalidate

Effective TTL: 3 minutes (max-age=201)

Last-Modified header present

Cache-Control

max-age=201, must-revalidate

Directive	Value	Meaning
max-age	201	Cache for 3 minutes
must-revalidate	—	Must recheck with server after expiry

Effective TTL: 201 seconds

Network Waterfall

34 requests over 930ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Third-Party Script Cost

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

INFO

53% of JavaScript execution is third-party

First-party Third-party 652ms · 167KB · $4/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
Google Tag Manager www.googletagmanager.com	Tag Manager	348ms	160 KB	40%	$2/mo	Costly
Unattributable Unattributable	Other	246ms	0 KB	—	$1/mo	Costly
s0.wp.com s0.wp.com	Other	57ms	7 KB	—	$0/mo	Optional

Google Tag Manager

Tag Manager

Costly

Execution 348ms

Transfer 160 KB

Unused 40%

Monthly Cost $2/mo

Unattributable

Other

Costly

Execution 246ms

Transfer 0 KB

Monthly Cost $1/mo

s0.wp.com

Other

Optional

Execution 57ms

Transfer 7 KB

Monthly Cost $0/mo

These scripts may cost more than they're worth

Google Tag Manager adds 348ms and costs ~$2/month
Unattributable adds 246ms and costs ~$1/month

53% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

Google Tag Manager takes 348ms 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

Unattributable takes 246ms 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.