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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
76
GRADE
C
FIX
4
REVIEW
2
PASS
7
INFO
2

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

95
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
84
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

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

766 ms

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

1.45 s

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

0 ms

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

0.003

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

766 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.

1.45 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
15
7 PASS 2 REVIEW 4 FIX
D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (1.5 MiB of 1.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
54 scripts, 600 KB unused
FIX
54 scripts, 600 KB unused
Warning::
https://c0.wp.com/c/6.9.4/wp-includes/js/dist/bloc...: 212 KB unused (83%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://c0.wp.com/c/6.9.4/wp-includes/js/dist/comp...: 193 KB unused (80%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-ES3L...: 71 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.joelonsoftware.com/wp-content/plugins/...: 52 KB unused (63%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://c0.wp.com/c/6.9.4/wp-includes/js/dist/vend...: 36 KB unused (87%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 600 KB
600 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://c0.wp.com/c/6.9.4/wp-includes/js/dist/block-editor.min.js258 KB212 KB (83%)3rd
https://c0.wp.com/c/6.9.4/wp-includes/js/dist/components.min.js240 KB193 KB (80%)3rd
https://www.googletagmanager.com/gtag/js?id=G-ES3L5VPF92&cx=c&_slc=1163 KB71 KB (44%)3rd
https://www.joelonsoftware.com/wp-content/plugins/blockprotocol/build/render.js?ver=d02daa73f930ea4bd87387 KB52 KB (63%)3rd
https://c0.wp.com/c/6.9.4/wp-includes/js/dist/vendor/react-dom.min.js42 KB36 KB (87%)3rd
https://c0.wp.com/c/6.9.4/wp-includes/js/dist/blocks.min.js54 KB36 KB (67%)3rd
https://c0.wp.com/c/6.9.4/wp-includes/js/dist/keycodes.min.js2 KB3rd
https://c0.wp.com/c/6.9.4/wp-includes/js/dist/private-apis.min.js1 KB3rd
https://www.joelonsoftware.com/wp-content/themes/editor-redux/js/editor.js?ver=201612022 KB3rd
https://www.joelonsoftware.com/wp-content/plugins/jetpack/_inc/build/twitter-timeline.min.js?ver=4.0.01 KB3rd

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

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

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

F
Page Weight Inventory
Action
80 resources · 1.5 MB · 600 KB savings available
FIX
80 resources · 1.5 MB · 600 KB savings available
Warning::
Page weight 561 KB over 1MB target
Got: 1.5 MB Expected: ≤ 1 MB
Info::
~600 KB of savings available
Warning::
79 third-party resources (100% of weight)
Info::
2 resources over 200KB
80 resources · 1.5 MiB · 79 third-party 561.3 KiB over 1MB target
JavaScript 71% · 1.1 MiB
Font 11% · 170.1 KiB
Image 9% · 150.5 KiB
Document 8% · 123.2 KiB
CSS 1% · 18.2 KiB
Other 0% · 2.5 KiB

~600.3 KiB of savings available

Remove unused JavaScript: 600.3 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

C
Page Weight Budget
Action
1.5 MB transferred, 80 requests
REVIEW
1.5 MB transferred, 80 requests
Info::
Page weighs 4.8 MB (1.5 MB transferred)
Warning::
JavaScript is 1.1 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.1 MB
Info::
80 HTTP requests
Info::
Estimated 0.32 g CO2 per page load
1.5 MB / 2.4 MB budget
1.5 MB transferred
80 requests
0.32 g CO2 per page load
JavaScript 1.1 MiB 71%
Fonts 170.1 KiB 11%
Images 148.9 KiB 9%
HTML 123.0 KiB 8%
CSS 18.2 KiB 1%
Other 2.1 KiB 0%
Other 1.8 KiB 0%
Other 470 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

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A
Image Optimization
8 images, 0 KB saveable
PASS
8 images, 0 KB saveable
Warning::
https://i0.wp.com/www.joelonsoftware.com/wp-conten... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
8 images 149 KB
0 oversized -0 KB
2 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+
JS Execution Cost
197ms total JS execution
PASS
197ms total JS execution
Info::
https://www.joelonsoftware.com/: 115ms CPU time
Info::
Unattributable: 82ms CPU time
Warning::
Third-party scripts: 197ms (100% of total)

Main Thread Breakdown

Script Evaluation 42% Script Parsing & Compilation 20% Other 18% Style & Layout 14% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.joelonsoftware.com/115ms6ms3ms3rd
Unattributable82ms13ms0ms3rd
A+
Font Loading
5 fonts (170 KB)
PASS
5 fonts (170 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

170 KB total

Render-blocking

0

of 5

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s FCP 766 ms LCP 1.4 shttps://fonts.gstatic.com/s/sourcesanspro/v23/6xK3dSBYKcSV-LCoeQqfX1RYOo3qOK7lujVj9w.woff26xK3dSBYKcSV-LCoeQqfX1R... https://fonts.gstatic.com/s/sourcesanspro/v23/6xK3dSBYKcSV-LCoeQqfX1RYOo3qOK7lujVj9w.woff2 — 14.5 KiB — 33 ms — font-display: swaphttps://www.joelonsoftware.com/wp-content/themes/editor-redux/inc/fontawesome/fontawesome-webfont.woff?v=4.1.0fontawesome-webfont.woff https://www.joelonsoftware.com/wp-content/themes/editor-redux/inc/fontawesome/fontawesome-webfont.woff?v=4.1.0 — 82.3 KiB — 7 ms — font-display: swaphttps://fonts.gstatic.com/s/robotocondensed/v31/ieVl2ZhZI2eCN5jzbjEETS9weq8-19K7DQk6YvM.woff2ieVl2ZhZI2eCN5jzbjEETS9... https://fonts.gstatic.com/s/robotocondensed/v31/ieVl2ZhZI2eCN5jzbjEETS9weq8-19K7DQk6YvM.woff2 — 45.0 KiB — 75 ms — font-display: swaphttps://fonts.gstatic.com/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3ig4vwlxdu3cOWxw.woff26xKydSBYKcSV-LCoeQqfX1R... https://fonts.gstatic.com/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3ig4vwlxdu3cOWxw.woff2 — 14.4 KiB — 62 ms — font-display: swaphttps://fonts.gstatic.com/s/sourcesanspro/v23/6xK1dSBYKcSV-LCoeQqfX1RYOo3qPZ7nsDJB9cme.woff26xK1dSBYKcSV-LCoeQqfX1R... https://fonts.gstatic.com/s/sourcesanspro/v23/6xK1dSBYKcSV-LCoeQqfX1RYOo3qPZ7nsDJB9cme.woff2 — 13.9 KiB — 52 ms — font-display: swap
6xK3dSBYKcSV-LCoeQqfX1R... woff2 swap
Size 15 KB
Load time 33 ms
Start 265 ms
Risk FOUT — text flashes from fallback to web font
fontawesome-webfont.woff woff swap
Size 82 KB
Load time 7 ms
Start 266 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
ieVl2ZhZI2eCN5jzbjEETS9... woff2 swap
Size 45 KB
Load time 75 ms
Start 266 ms
Risk FOUT — text flashes from fallback to web font
6xKydSBYKcSV-LCoeQqfX1R... woff2 swap
Size 14 KB
Load time 62 ms
Start 266 ms
Risk FOUT — text flashes from fallback to web font
6xK1dSBYKcSV-LCoeQqfX1R... woff2 swap
Size 14 KB
Load time 52 ms
Start 266 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)

Fixing the unchecked items could save ~25 KB and ~50 ms

A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
80 requests over 1077ms
INFO
0 ms 500 ms 1.0 s 1.5 s FCP 766 ms LCP 1.4 shttps://joelonsoftware.com// https://joelonsoftware.com/ — 301 — 211 B — 32 ms — h2https://www.joelonsoftware.com/www.joelonsoftware.com/ https://www.joelonsoftware.com/ — 200 — 19.2 KiB — 9 ms — h2https://www.joelonsoftware.com/wp-content/plugins/cloudflare-stream/dist/blocks.style.build.css?ver=1671234854www.joelonsoftware.com/wp-content/p... https://www.joelonsoftware.com/wp-content/plugins/cloudflare-stream/dist/blocks.style.build.css?ver=1671234854 — 200 — 744 B — 10 ms — h2https://www.joelonsoftware.com/wp-content/themes/editor-redux/style.css?ver=6.9.4www.joelonsoftware.com/wp-content/t... https://www.joelonsoftware.com/wp-content/themes/editor-redux/style.css?ver=6.9.4 — 200 — 10.5 KiB — 8 ms — h2https://www.joelonsoftware.com/wp-content/themes/editor-redux/inc/fontawesome/font-awesome.css?ver=4.1.0www.joelonsoftware.com/wp-content/t... https://www.joelonsoftware.com/wp-content/themes/editor-redux/inc/fontawesome/font-awesome.css?ver=4.1.0 — 200 — 5.2 KiB — 11 ms — h2https://fonts.googleapis.com/css?family=Source%20Sans%20Pro%3A400%2C600%2C700%2C400italic%2C600italic%2C700italic%7CRoboto%20Condensed%3A300%2C400%2C700%2C300italic%2C400italic%2C700italic&subset=latin%2Clatin-extfonts.googleapis.com/css?family=Sou... https://fonts.googleapis.com/css?family=Source%20Sans%20Pro%3A400%2C600%2C700%2C400italic%2C600italic%2C700italic%7CRoboto%20Condensed%3A300%2C400%2C700%2C300italic%2C400italic%2C700italic&subset=latin%2Clatin-ext — 200 — 1.8 KiB — 127 ms — h2https://c0.wp.com/c/6.9.4/wp-includes/js/jquery/jquery.min.jsc0.wp.com/c/6.9.4/wp-includes/js/jq... https://c0.wp.com/c/6.9.4/wp-includes/js/jquery/jquery.min.js — 200 — 31.1 KiB — 18 ms — h2https://c0.wp.com/c/6.9.4/wp-includes/js/jquery/jquery-migrate.min.jsc0.wp.com/c/6.9.4/wp-includes/js/jq... https://c0.wp.com/c/6.9.4/wp-includes/js/jquery/jquery-migrate.min.js — 200 — 5.3 KiB — 17 ms — h2https://i0.wp.com/www.joelonsoftware.com/wp-content/uploads/2016/12/Pong.png?w=730&ssl=1i0.wp.com/www.joelonsoftware.com/wp... https://i0.wp.com/www.joelonsoftware.com/wp-content/uploads/2016/12/Pong.png?w=730&ssl=1 — 200 — 111.5 KiB — 27 ms — h2https://i0.wp.com/www.joelonsoftware.com/wp-content/uploads/2016/12/newdesign-books.png?w=730&ssl=1i0.wp.com/www.joelonsoftware.com/wp... https://i0.wp.com/www.joelonsoftware.com/wp-content/uploads/2016/12/newdesign-books.png?w=730&ssl=1 — 200 — 6.3 KiB — 20 ms — h2https://i0.wp.com/www.joelonsoftware.com/wp-content/uploads/2016/12/jobs.jpg?w=730&ssl=1i0.wp.com/www.joelonsoftware.com/wp... https://i0.wp.com/www.joelonsoftware.com/wp-content/uploads/2016/12/jobs.jpg?w=730&ssl=1 — 200 — 8.4 KiB — 5 ms — h2https://i0.wp.com/www.joelonsoftware.com/wp-content/uploads/2016/12/so-logo.png?w=730&ssl=1i0.wp.com/www.joelonsoftware.com/wp... https://i0.wp.com/www.joelonsoftware.com/wp-content/uploads/2016/12/so-logo.png?w=730&ssl=1 — 200 — 11.5 KiB — 3 ms — h2https://i0.wp.com/stackexchange.com/users/flair/4.png?resize=208%2C58&ssl=1i0.wp.com/stackexchange.com/users/f... https://i0.wp.com/stackexchange.com/users/flair/4.png?resize=208%2C58&ssl=1 — 200 — 7.1 KiB — 3 ms — h2https://www.joelonsoftware.com/wp-content/themes/editor-redux/js/jquery.fitvids.js?ver=20140820www.joelonsoftware.com/wp-content/t... https://www.joelonsoftware.com/wp-content/themes/editor-redux/js/jquery.fitvids.js?ver=20140820 — 200 — 1.6 KiB — 5 ms — h2https://www.joelonsoftware.com/wp-content/themes/editor-redux/js/editor.js?ver=20161202www.joelonsoftware.com/wp-content/t... https://www.joelonsoftware.com/wp-content/themes/editor-redux/js/editor.js?ver=20161202 — 200 — 1.8 KiB — 8 ms — h2https://www.joelonsoftware.com/wp-content/plugins/jetpack/_inc/build/twitter-timeline.min.js?ver=4.0.0www.joelonsoftware.com/wp-content/p... https://www.joelonsoftware.com/wp-content/plugins/jetpack/_inc/build/twitter-timeline.min.js?ver=4.0.0 — 200 — 638 B — 4 ms — h2https://c0.wp.com/c/6.9.4/wp-includes/js/dist/vendor/react.min.jsc0.wp.com/c/6.9.4/wp-includes/js/di... https://c0.wp.com/c/6.9.4/wp-includes/js/dist/vendor/react.min.js — 200 — 4.5 KiB — 2 ms — h2https://c0.wp.com/c/6.9.4/wp-includes/js/dist/vendor/react-dom.min.jsc0.wp.com/c/6.9.4/wp-includes/js/di... https://c0.wp.com/c/6.9.4/wp-includes/js/dist/vendor/react-dom.min.js — 200 — 41.7 KiB — 3 ms — h2https://c0.wp.com/c/6.9.4/wp-includes/js/dist/hooks.min.jsc0.wp.com/c/6.9.4/wp-includes/js/di... https://c0.wp.com/c/6.9.4/wp-includes/js/dist/hooks.min.js — 200 — 2.3 KiB — 4 ms — h2https://c0.wp.com/c/6.9.4/wp-includes/js/dist/i18n.min.jsc0.wp.com/c/6.9.4/wp-includes/js/di... https://c0.wp.com/c/6.9.4/wp-includes/js/dist/i18n.min.js — 200 — 2.5 KiB — 2 ms — h2https://c0.wp.com/c/6.9.4/wp-includes/js/dist/url.min.jsc0.wp.com/c/6.9.4/wp-includes/js/di... https://c0.wp.com/c/6.9.4/wp-includes/js/dist/url.min.js — 200 — 4.1 KiB — 2 ms — h2https://c0.wp.com/c/6.9.4/wp-includes/js/dist/api-fetch.min.jsc0.wp.com/c/6.9.4/wp-includes/js/di... https://c0.wp.com/c/6.9.4/wp-includes/js/dist/api-fetch.min.js — 200 — 2.8 KiB — 2 ms — h2https://c0.wp.com/c/6.9.4/wp-includes/js/dist/vendor/react-jsx-runtime.min.jsc0.wp.com/c/6.9.4/wp-includes/js/di... https://c0.wp.com/c/6.9.4/wp-includes/js/dist/vendor/react-jsx-runtime.min.js — 200 — 969 B — 2 ms — h2https://c0.wp.com/c/6.9.4/wp-includes/js/dist/dom-ready.min.jsc0.wp.com/c/6.9.4/wp-includes/js/di... https://c0.wp.com/c/6.9.4/wp-includes/js/dist/dom-ready.min.js — 200 — 821 B — 2 ms — h2https://c0.wp.com/c/6.9.4/wp-includes/js/dist/a11y.min.jsc0.wp.com/c/6.9.4/wp-includes/js/di... https://c0.wp.com/c/6.9.4/wp-includes/js/dist/a11y.min.js — 200 — 1.2 KiB — 2 ms — h2https://c0.wp.com/c/6.9.4/wp-includes/js/dist/blob.min.jsc0.wp.com/c/6.9.4/wp-includes/js/di... https://c0.wp.com/c/6.9.4/wp-includes/js/dist/blob.min.js — 200 — 915 B — 3 ms — h2https://c0.wp.com/c/6.9.4/wp-includes/js/dist/block-serialization-default-parser.min.jsc0.wp.com/c/6.9.4/wp-includes/js/di... https://c0.wp.com/c/6.9.4/wp-includes/js/dist/block-serialization-default-parser.min.js — 200 — 1.4 KiB — 2 ms — h2https://c0.wp.com/c/6.9.4/wp-includes/js/dist/autop.min.jsc0.wp.com/c/6.9.4/wp-includes/js/di... https://c0.wp.com/c/6.9.4/wp-includes/js/dist/autop.min.js — 200 — 2.5 KiB — 3 ms — h2https://c0.wp.com/c/6.9.4/wp-includes/js/dist/deprecated.min.jsc0.wp.com/c/6.9.4/wp-includes/js/di... https://c0.wp.com/c/6.9.4/wp-includes/js/dist/deprecated.min.js — 200 — 810 B — 2 ms — h2https://c0.wp.com/c/6.9.4/wp-includes/js/dist/dom.min.jsc0.wp.com/c/6.9.4/wp-includes/js/di... https://c0.wp.com/c/6.9.4/wp-includes/js/dist/dom.min.js — 200 — 5.1 KiB — 3 ms — h2
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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 197ms · 19KB · $3/mo
www.joelonsoftware.com
Other
Optional
Execution 115ms
Transfer 19 KB
Monthly Cost $2/mo
Unattributable
Other
Optional
Execution 82ms
Transfer 0 KB
Monthly Cost $1/mo

100% 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

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.

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