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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
91
GRADE
A
FIX
2
REVIEW
1
PASS
12
INFO
2

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

Mobile Desktop
94
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
76
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
88
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.

2.41 s

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

2.49 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.

0.006

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

2.51 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.

2.50 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
17
12 PASS 1 REVIEW 2 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 (166.4 KiB of 166.6 KiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
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
Image Optimization
Action
14 images, 0 KB saveable
REVIEW
14 images, 0 KB saveable
Warning::
https://www.openoffice.org/images/AOO_logos/100Mil... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.openoffice.org/images/logo-rss-16.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.openoffice.org/images/logo-facebook-16... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.openoffice.org/images/logo-twitter-16.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.openoffice.org/images/logo-youtube-16.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
14 images 70 KB
0 oversized -0 KB
13 legacy format
5 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

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

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+
Page Weight Budget
167 KB transferred, 26 requests
PASS
167 KB transferred, 26 requests
Info::
Page weighs 304 KB (167 KB transferred)
Info::
26 HTTP requests
Info::
Estimated 0.03 g CO2 per page load
167 KB / 2.4 MB budget
167 KB transferred
26 requests
0.03 g CO2 per page load
Images 70.1 KiB 42%
Other 32.6 KiB 20%
CSS 28.4 KiB 17%
JavaScript 25.5 KiB 15%
HTML 10.1 KiB 6%
0 2.4 MB 4.9 MB
Under budget
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
414ms total JS execution
PASS
414ms total JS execution
Info::
https://www.openoffice.org/: 234ms CPU time
Info::
Unattributable: 179ms CPU time
Warning::
Third-party scripts: 414ms (100% of total)

Main Thread Breakdown

Other 48% Style & Layout 28% Rendering 9% Script Evaluation 5% Parse HTML & CSS 5% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
https://www.openoffice.org/234ms13ms4ms3rd
Unattributable179ms6ms0ms3rd
A+
Font Loading
No web fonts (system fonts)
PASS
No web fonts (system fonts)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
A
JS Bundles
5 scripts, 0 KB unused
PASS
5 scripts, 0 KB unused
Warning::
https://www.openoffice.org/download/download.js: unminified — 5 KB could be saved
0 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.apachecon.com/event-images/snippet.js0 KB—✓3rd
https://www.openoffice.org/download/globalvars.js4 KB—✓3rd
https://www.openoffice.org/msg_prop_l10n.js5 KB—✓3rd
https://www.openoffice.org/download/languages.js4 KB—✓3rd
https://www.openoffice.org/download/download.js13 KB—✗3rd
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
26 resources · 167 KB · 0 KB savings available
PASS
26 resources · 167 KB · 0 KB savings available
Info::
Within 1MB page-weight target
Got: 167 KB
Warning::
25 third-party resources (100% of weight)
26 resources · 166.6 KiB · 25 third-party Within 1MB page-weight target
Image 61% · 102.5 KiB
CSS 17% · 28.4 KiB
JavaScript 15% · 25.5 KiB
Document 6% · 10.3 KiB
A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
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: Hetzner Online GmbH

Network Waterfall
26 requests over 1441ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 2.4 s LCP 2.5 shttps://openoffice.org// https://openoffice.org/ — 302 — 237 B — 308 ms — http/1.1https://www.openoffice.org/www.openoffice.org/ https://www.openoffice.org/ — 200 — 10.1 KiB — 314 ms — http/1.1https://www.openoffice.org/css/ooo.csswww.openoffice.org/css/ooo.css https://www.openoffice.org/css/ooo.css — 200 — 3.4 KiB — 101 ms — http/1.1https://www.apachecon.com/event-images/snippet.jswww.apachecon.com/event-images/snip... https://www.apachecon.com/event-images/snippet.js — -1 — 0 B — 46 ms — https://www.openoffice.org/download/globalvars.jswww.openoffice.org/download/globalv... https://www.openoffice.org/download/globalvars.js — 200 — 4.4 KiB — 299 ms — http/1.1https://www.openoffice.org/msg_prop_l10n.jswww.openoffice.org/msg_prop_l10n.js https://www.openoffice.org/msg_prop_l10n.js — 200 — 4.6 KiB — 306 ms — http/1.1https://www.openoffice.org/download/languages.jswww.openoffice.org/download/languag... https://www.openoffice.org/download/languages.js — 200 — 3.8 KiB — 304 ms — http/1.1https://www.openoffice.org/download/download.jswww.openoffice.org/download/downloa... https://www.openoffice.org/download/download.js — 200 — 12.7 KiB — 306 ms — http/1.1https://www.openoffice.org/css/home.csswww.openoffice.org/css/home.css https://www.openoffice.org/css/home.css — 200 — 2.8 KiB — 198 ms — http/1.1https://www.openoffice.org/css/styles.csswww.openoffice.org/css/styles.css https://www.openoffice.org/css/styles.css — 200 — 18.9 KiB — 387 ms — http/1.1https://www.openoffice.org/css/exceptions.csswww.openoffice.org/css/exceptions.c... https://www.openoffice.org/css/exceptions.css — 200 — 3.3 KiB — 290 ms — http/1.1https://www.openoffice.org/images/AOO_logos/100MillAOO100px.pngwww.openoffice.org/images/AOO_logos... https://www.openoffice.org/images/AOO_logos/100MillAOO100px.png — 200 — 32.6 KiB — 196 ms — http/1.1https://www.openoffice.org/images/logo-rss-16.pngwww.openoffice.org/images/logo-rss-... https://www.openoffice.org/images/logo-rss-16.png — 200 — 1.7 KiB — 99 ms — http/1.1https://www.openoffice.org/images/logo-facebook-16.pngwww.openoffice.org/images/logo-face... https://www.openoffice.org/images/logo-facebook-16.png — 200 — 1.5 KiB — 103 ms — http/1.1https://www.openoffice.org/images/logo-twitter-16.pngwww.openoffice.org/images/logo-twit... https://www.openoffice.org/images/logo-twitter-16.png — 200 — 1.4 KiB — 103 ms — http/1.1https://www.openoffice.org/images/logo-youtube-16.pngwww.openoffice.org/images/logo-yout... https://www.openoffice.org/images/logo-youtube-16.png — 200 — 1.6 KiB — 103 ms — http/1.1https://www.openoffice.org/images/asf_logo_small.pngwww.openoffice.org/images/asf_logo_... https://www.openoffice.org/images/asf_logo_small.png — 200 — 6.2 KiB — 103 ms — http/1.1https://www.w3.org/Icons/valid-xhtml10-blue.pngwww.w3.org/Icons/valid-xhtml10-blue... https://www.w3.org/Icons/valid-xhtml10-blue.png — -1 — 0 B — 0 ms — https://www.openoffice.org/images/action-info.pngwww.openoffice.org/images/action-in... https://www.openoffice.org/images/action-info.png — 200 — 4.0 KiB — 102 ms — http/1.1https://www.openoffice.org/images/action-download.pngwww.openoffice.org/images/action-do... https://www.openoffice.org/images/action-download.png — 200 — 3.3 KiB — 161 ms — http/1.1https://www.openoffice.org/images/action-social.pngwww.openoffice.org/images/action-so... https://www.openoffice.org/images/action-social.png — 200 — 4.9 KiB — 175 ms — http/1.1https://www.openoffice.org/images/action-help.pngwww.openoffice.org/images/action-he... https://www.openoffice.org/images/action-help.png — 200 — 4.7 KiB — 175 ms — http/1.1https://www.openoffice.org/images/action-participate.pngwww.openoffice.org/images/action-pa... https://www.openoffice.org/images/action-participate.png — 200 — 3.8 KiB — 173 ms — http/1.1https://www.openoffice.org/images/campaign-divider.pngwww.openoffice.org/images/campaign-... https://www.openoffice.org/images/campaign-divider.png — 200 — 1.4 KiB — 172 ms — http/1.1https://www.openoffice.org/images/action-extend.pngwww.openoffice.org/images/action-ex... https://www.openoffice.org/images/action-extend.png — 200 — 2.9 KiB — 175 ms — http/1.1https://www.openoffice.org/favicon.icowww.openoffice.org/favicon.ico https://www.openoffice.org/favicon.ico — 200 — 32.4 KiB — 194 ms — http/1.1
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 414ms · 10KB · €4/mo
www.openoffice.org
Other
Costly
Execution 234ms
Transfer 10 KB
Monthly Cost €3/mo
Unattributable
Other
Optional
Execution 179ms
Transfer 0 KB
Monthly Cost €2/mo

These scripts may cost more than they're worth

  • www.openoffice.org adds 234ms and costs ~€3/month

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

www.openoffice.org takes 234ms 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.

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