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https://jqueryui.com

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
98
GRADE
A+
FIX
0
REVIEW
1
PASS
12
INFO
1

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

Mobile Desktop
100
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
82
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
92
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
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.

504 ms

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

506 ms

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.

0.013

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

504 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.

506 ms

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
14
12 PASS 1 REVIEW
B
Image Optimization
9 images, 0 KB saveable
REVIEW
9 images, 0 KB saveable
Info::
All images are well-optimized
9 images 38 KB
0 oversized -0 KB
8 legacy format
0 missing dimensions CLS risk
A+
Page Weight Budget
155 KB transferred, 19 requests
PASS
155 KB transferred, 19 requests
Info::
Page weighs 300 KB (155 KB transferred)
Info::
19 HTTP requests
Info::
Estimated 0.03 g CO2 per page load
155 KB / 2.4 MB budget
155 KB transferred
19 requests
0.03 g CO2 per page load
Fonts 58.6 KiB 38%
Images 37.5 KiB 24%
JavaScript 31.1 KiB 20%
CSS 18.3 KiB 12%
HTML 6.9 KiB 4%
Other 2.7 KiB 2%
0 2.4 MB 4.9 MB
Under budget
A+
Third-Party Impact
18% third-party, 0 ms blocking
PASS
18% third-party, 0 ms blocking
Info::
Third-party code accounts for 18% of page weight (27.2 KiB of 155.1 KiB)
Info::
Third-party blocking time is low (0 ms)
82%
18%
First-party Third-party
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+
JS Execution Cost
55ms total JS execution
PASS
55ms total JS execution
Info::
https://jqueryui.com/: 55ms CPU time

Main Thread Breakdown

Other 39% Style & Layout 37% Script Evaluation 10% Rendering 8% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://jqueryui.com/55ms1ms0ms1st
A+
Font Loading
2 fonts (59 KB)
PASS
2 fonts (59 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

59 KB total

Render-blocking

0

of 2

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s FCP 504 ms LCP 506 mshttps://jqueryui.com/wp-content/themes/jquery/lib/Cairo/Cairo-Bold.woff2Cairo-Bold.woff2 https://jqueryui.com/wp-content/themes/jquery/lib/Cairo/Cairo-Bold.woff2 — 35.4 KiB — 34 ms — font-display: swaphttps://jqueryui.com/wp-content/themes/jquery/lib/FontAwesome/fontawesome-webfont.woff2fontawesome-webfont.woff2 https://jqueryui.com/wp-content/themes/jquery/lib/FontAwesome/fontawesome-webfont.woff2 — 23.1 KiB — 32 ms — font-display: swap
Cairo-Bold.woff2 woff2 swap
Size 35 KB
Load time 34 ms
Start 164 ms
Risk FOUT — text flashes from fallback to web font
fontawesome-webfont.woff2 woff2 swap
Size 23 KB
Load time 32 ms
Start 165 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+
JS Bundles
3 scripts, 0 KB unused
PASS
3 scripts, 0 KB unused
0 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://code.jquery.com/jquery-4.0.0.min.js27 KB—✓3rd
https://jqueryui.com/wp-content/themes/jquery/js/main.js?v=10baaffd2 KB—✓1st
https://jqueryui.com/wp-content/themes/jquery/lib/typesense-minibar/typesense-minibar.js?v=830f1ee12 KB—✓1st
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
A+
Page Weight Inventory
19 resources · 155 KB · 0 KB savings available
PASS
19 resources · 155 KB · 0 KB savings available
Info::
Within 1MB page-weight target
Got: 155 KB
Info::
2 third-party resources (18% of weight)
19 resources · 155.1 KiB · 2 third-party Within 1MB page-weight target
Font 38% · 58.6 KiB
Image 26% · 40.3 KiB
JavaScript 20% · 31.1 KiB
CSS 12% · 18.3 KiB
Document 4% · 6.9 KiB
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

A+
HTTP Caching
max-age=300 (5 minutes)
PASS
max-age=300 (5 minutes)
Info::
Cache-Control header is set
Got: public, max-age=300
Info::
Effective TTL: 5 minutes (max-age=300)
Info::
Last-Modified header present
Cache-Control

public, max-age=300

DirectiveValueMeaning
public—Any cache may store this response
max-age300Cache for 5 minutes
Effective TTL: 300 seconds
Network Waterfall
19 requests over 242ms
INFO
0 ms 200 ms 400 ms FCP 504 ms LCP 506 mshttps://jqueryui.com// https://jqueryui.com/ — 200 — 6.9 KiB — 67 ms — h2https://jqueryui.com/wp-content/themes/jquery/lib/typesense-minibar/typesense-minibar.css?v=c5fa9b9a/wp-content/themes/jquery/lib/types... https://jqueryui.com/wp-content/themes/jquery/lib/typesense-minibar/typesense-minibar.css?v=c5fa9b9a — 200 — 4.2 KiB — 32 ms — h2https://jqueryui.com/wp-content/themes/jquery/css/base.css?v=4a1b65ae/wp-content/themes/jquery/css/base.... https://jqueryui.com/wp-content/themes/jquery/css/base.css?v=4a1b65ae — 200 — 13.3 KiB — 33 ms — h2https://jqueryui.com/wp-content/themes/jqueryui.com/style.css?v=7c7f86f2/wp-content/themes/jqueryui.com/sty... https://jqueryui.com/wp-content/themes/jqueryui.com/style.css?v=7c7f86f2 — 200 — 908 B — 33 ms — h2https://code.jquery.com/jquery-4.0.0.min.jscode.jquery.com/jquery-4.0.0.min.js https://code.jquery.com/jquery-4.0.0.min.js — 200 — 27.2 KiB — 12 ms — h2https://jqueryui.com/wp-content/themes/jquery/js/main.js?v=10baaffd/wp-content/themes/jquery/js/main.j... https://jqueryui.com/wp-content/themes/jquery/js/main.js?v=10baaffd — 200 — 1.6 KiB — 33 ms — h2https://jqueryui.com/wp-content/themes/jquery/lib/typesense-minibar/typesense-minibar.js?v=830f1ee1/wp-content/themes/jquery/lib/types... https://jqueryui.com/wp-content/themes/jquery/lib/typesense-minibar/typesense-minibar.js?v=830f1ee1 — 200 — 2.2 KiB — 35 ms — h2https://jqueryui.com/wp-content/themes/jquery/content/books/jquery-ui-in-action.jpg/wp-content/themes/jquery/content/b... https://jqueryui.com/wp-content/themes/jquery/content/books/jquery-ui-in-action.jpg — 200 — 9.3 KiB — 36 ms — h2https://jqueryui.com/wp-content/themes/jquery/content/books/jquery-ui-themes.jpg/wp-content/themes/jquery/content/b... https://jqueryui.com/wp-content/themes/jquery/content/books/jquery-ui-themes.jpg — 200 — 5.0 KiB — 33 ms — h2https://jqueryui.com/wp-content/themes/jquery/content/books/jquery-ui-cookbook.jpg/wp-content/themes/jquery/content/b... https://jqueryui.com/wp-content/themes/jquery/content/books/jquery-ui-cookbook.jpg — 200 — 7.0 KiB — 26 ms — h2https://jqueryui.com/wp-content/themes/jquery/images/jq-nav-icons.png/wp-content/themes/jquery/images/jq... https://jqueryui.com/wp-content/themes/jquery/images/jq-nav-icons.png — 200 — 7.9 KiB — 29 ms — h2https://jqueryui.com/wp-content/themes/jquery/images/logo-jquery-ui.png/wp-content/themes/jquery/images/lo... https://jqueryui.com/wp-content/themes/jquery/images/logo-jquery-ui.png — 200 — 4.5 KiB — 30 ms — h2data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='654 -372 1664 1664' width='20' …www.w3.org/2000/svg' viewBox='654 -... data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='654 -372 1664 1664' width='20' … — 200 — 0 B — 0 ms — datahttps://jqueryui.com/wp-content/themes/jquery/images/dark-grey-tile.png/wp-content/themes/jquery/images/da... https://jqueryui.com/wp-content/themes/jquery/images/dark-grey-tile.png — 200 — 2.8 KiB — 29 ms — h2https://jqueryui.com/wp-content/themes/jquery/images/logo-digitalocean.svg/wp-content/themes/jquery/images/lo... https://jqueryui.com/wp-content/themes/jquery/images/logo-digitalocean.svg — 200 — 499 B — 28 ms — h2https://jqueryui.com/wp-content/themes/jquery/images/logo-wordpress.svg/wp-content/themes/jquery/images/lo... https://jqueryui.com/wp-content/themes/jquery/images/logo-wordpress.svg — 200 — 641 B — 30 ms — h2https://jqueryui.com/wp-content/themes/jquery/lib/Cairo/Cairo-Bold.woff2/wp-content/themes/jquery/lib/Cairo... https://jqueryui.com/wp-content/themes/jquery/lib/Cairo/Cairo-Bold.woff2 — 200 — 35.4 KiB — 34 ms — h2https://jqueryui.com/wp-content/themes/jquery/lib/FontAwesome/fontawesome-webfont.woff2/wp-content/themes/jquery/lib/FontA... https://jqueryui.com/wp-content/themes/jquery/lib/FontAwesome/fontawesome-webfont.woff2 — 200 — 23.1 KiB — 32 ms — h2https://jqueryui.com/wp-content/themes/jqueryui.com/i/favicon.ico/wp-content/themes/jqueryui.com/i/f... https://jqueryui.com/wp-content/themes/jqueryui.com/i/favicon.ico — 200 — 2.7 KiB — 30 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
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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