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https://libreoffice.org

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
83
GRADE
B
FIX
3
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
92
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
88
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.
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.

1.15 s

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

1.31 s

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

40 ms

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

0.045

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

1.58 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.

1.92 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 3 REVIEW 3 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 (1.7 MiB of 1.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
52 resources · 1.7 MB · 31 KB savings available
FIX
52 resources · 1.7 MB · 31 KB savings available
Warning::
Page weight 704 KB over 1MB target
Got: 1.7 MB Expected: ≤ 1 MB
Warning::
51 third-party resources (100% of weight)
Info::
1 resources over 200KB
52 resources · 1.7 MiB · 51 third-party 703.9 KiB over 1MB target
Image 46% · 795.2 KiB
Font 42% · 723.7 KiB
JavaScript 6% · 105.6 KiB
Other 5% · 80.0 KiB
CSS 1% · 16.7 KiB
Document 0% · 6.7 KiB

~30.7 KiB of savings available

Remove unused JavaScript: 30.7 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
1.7 MB transferred, 52 requests
REVIEW
1.7 MB transferred, 52 requests
Info::
Page weighs 2.1 MB (1.7 MB transferred)
Info::
Fonts are 724 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 724 KB
Info::
52 HTTP requests
Info::
Estimated 0.35 g CO2 per page load
1.7 MB / 2.4 MB budget
1.7 MB transferred
52 requests
0.35 g CO2 per page load
Images 793.6 KiB 46%
Fonts 723.7 KiB 42%
JavaScript 105.6 KiB 6%
Other 79.6 KiB 5%
CSS 16.7 KiB 1%
HTML 6.6 KiB 0%
Other 1.7 KiB 0%
Other 402 B 0%
0 2.4 MB 4.9 MB
Approaching limit

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

C
Image Optimization
Action
32 images, 0 KB saveable
REVIEW
32 images, 0 KB saveable
Warning::
https://www.libreoffice.org/media/libo-base.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.libreoffice.org/media/screenshot_calc.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.libreoffice.org/media/screenshot_impre... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.libreoffice.org/media/screenshot_draw.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.libreoffice.org/media/illustration1.pn... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.libreoffice.org/media/libreoffice-tdf-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.libreoffice.org/media/screenshot_write... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.libreoffice.org/media/illustration2.pn... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.libreoffice.org/media/screenshot_write... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.libreoffice.org/media/libo-draw.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.libreoffice.org/media/libo-calc.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.libreoffice.org/media/libo-impress.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.libreoffice.org/media/illustration3.pn... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.libreoffice.org/media/libo-math.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.libreoffice.org/media/libo-writer.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.libreoffice.org/media/screenshot_base.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.libreoffice.org/media/screenshot_math.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
32 images 794 KB
0 oversized -0 KB
30 legacy format
18 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

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

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

Set explicit width and height to prevent CLS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

B
JS Execution Cost
515ms total JS execution
REVIEW
515ms total JS execution
Warning::
Unattributable: 257ms CPU time
Info::
https://www.libreoffice.org/: 156ms CPU time
Info::
https://www.libreoffice.org/js/leaflet.js: 102ms CPU time
Warning::
Third-party scripts: 515ms (100% of total)

Main Thread Breakdown

Other 35% Script Evaluation 35% Style & Layout 17% Rendering 7%
ScriptTotalScriptingParse/CompileParty
Unattributable257ms123ms0ms3rd
https://www.libreoffice.org/156ms5ms0ms3rd
https://www.libreoffice.org/js/leaflet.js102ms30ms8ms3rd
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+
Font Loading
4 fonts (724 KB)
PASS
4 fonts (724 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

724 KB total

Render-blocking

0

of 4

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 2.0 s FCP 1.1 s LCP 1.3 shttps://www.libreoffice.org/fonts/Lato-Regular.woff2Lato-Regular.woff2 https://www.libreoffice.org/fonts/Lato-Regular.woff2 — 179.3 KiB — 578 ms — font-display: swaphttps://www.libreoffice.org/fonts/Lato-Black.woff2Lato-Black.woff2 https://www.libreoffice.org/fonts/Lato-Black.woff2 — 173.4 KiB — 590 ms — font-display: swaphttps://www.libreoffice.org/fonts/Lato-Bold.woff2Lato-Bold.woff2 https://www.libreoffice.org/fonts/Lato-Bold.woff2 — 181.4 KiB — 733 ms — font-display: swaphttps://www.libreoffice.org/fonts/Lato-BoldItalic.woff2Lato-BoldItalic.woff2 https://www.libreoffice.org/fonts/Lato-BoldItalic.woff2 — 189.6 KiB — 734 ms — font-display: swap
Lato-Regular.woff2 woff2 swap
Size 179 KB
Load time 578 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
Lato-Black.woff2 woff2 swap
Size 173 KB
Load time 590 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
Lato-Bold.woff2 woff2 swap
Size 181 KB
Load time 733 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
Lato-BoldItalic.woff2 woff2 swap
Size 190 KB
Load time 734 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
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 ~362 KB and ~724 ms

A+
JS Bundles
9 scripts, 31 KB unused
PASS
9 scripts, 31 KB unused
Warning::
https://www.libreoffice.org/js/leaflet.js: 31 KB unused (61%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 31 KB
31 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.libreoffice.org/js/leaflet.js51 KB31 KB (61%)✓3rd
https://www.libreoffice.org/js/flexsearch.js12 KB—✓3rd
https://www.libreoffice.org/js/fastsearch.js2 KB—✓3rd
https://www.libreoffice.org/js/libreoffice.js3 KB—✓3rd
https://www.libreoffice.org/js/matomo.js1 KB—✓3rd
https://www.libreoffice.org/js/platform_detector.js2 KB—✓3rd
https://www.libreoffice.org/js/download.js2 KB—✓3rd
https://www.libreoffice.org/js/community_map.js6 KB—✓3rd
https://piwik.documentfoundation.org/piwik.js25 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

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+
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
52 requests over 3874ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 1.1 s LCP 1.3 shttps://libreoffice.org// https://libreoffice.org/ — 301 — 82 B — 657 ms — h2https://www.libreoffice.org/www.libreoffice.org/ https://www.libreoffice.org/ — 200 — 6.6 KiB — 174 ms — h2https://www.libreoffice.org/css/normalize.csswww.libreoffice.org/css/normalize.c... https://www.libreoffice.org/css/normalize.css — 200 — 2.5 KiB — 165 ms — h2https://www.libreoffice.org/css/default.csswww.libreoffice.org/css/default.css https://www.libreoffice.org/css/default.css — 200 — 9.4 KiB — 166 ms — h2https://www.libreoffice.org/css/leaflet.csswww.libreoffice.org/css/leaflet.css https://www.libreoffice.org/css/leaflet.css — 200 — 4.7 KiB — 324 ms — h2https://www.libreoffice.org/media/libreoffice-tdf-logo.svgwww.libreoffice.org/media/libreoffi... https://www.libreoffice.org/media/libreoffice-tdf-logo.svg — 200 — 4.8 KiB — 326 ms — h2https://www.libreoffice.org/media/screenshot_writer_hero.pngwww.libreoffice.org/media/screensho... https://www.libreoffice.org/media/screenshot_writer_hero.png — 200 — 97.4 KiB — 645 ms — h2https://www.libreoffice.org/js/flexsearch.jswww.libreoffice.org/js/flexsearch.j... https://www.libreoffice.org/js/flexsearch.js — 200 — 12.2 KiB — 641 ms — h2https://www.libreoffice.org/js/fastsearch.jswww.libreoffice.org/js/fastsearch.j... https://www.libreoffice.org/js/fastsearch.js — 200 — 2.4 KiB — 483 ms — h2https://www.libreoffice.org/js/libreoffice.jswww.libreoffice.org/js/libreoffice.... https://www.libreoffice.org/js/libreoffice.js — 200 — 3.1 KiB — 485 ms — h2https://www.libreoffice.org/js/matomo.jswww.libreoffice.org/js/matomo.js https://www.libreoffice.org/js/matomo.js — 200 — 994 B — 329 ms — h2https://www.libreoffice.org/js/leaflet.jswww.libreoffice.org/js/leaflet.js https://www.libreoffice.org/js/leaflet.js — 200 — 51.2 KiB — 345 ms — h2https://www.libreoffice.org/media/subtle-prism.svgwww.libreoffice.org/media/subtle-pr... https://www.libreoffice.org/media/subtle-prism.svg — 200 — 1.7 KiB — 280 ms — h2https://www.libreoffice.org/media/libo-math.svgwww.libreoffice.org/media/libo-math... https://www.libreoffice.org/media/libo-math.svg — 200 — 1.3 KiB — 282 ms — h2https://www.libreoffice.org/media/libo-draw.svgwww.libreoffice.org/media/libo-draw... https://www.libreoffice.org/media/libo-draw.svg — 200 — 1.2 KiB — 284 ms — h2https://www.libreoffice.org/media/searchicon.pngwww.libreoffice.org/media/searchico... https://www.libreoffice.org/media/searchicon.png — 200 — 1.4 KiB — 286 ms — h2https://www.libreoffice.org/media/libo-impress.svgwww.libreoffice.org/media/libo-impr... https://www.libreoffice.org/media/libo-impress.svg — 200 — 1.3 KiB — 288 ms — h2https://www.libreoffice.org/media/libo-base.svgwww.libreoffice.org/media/libo-base... https://www.libreoffice.org/media/libo-base.svg — 200 — 1.2 KiB — 290 ms — h2https://www.libreoffice.org/fonts/Lato-Regular.woff2www.libreoffice.org/fonts/Lato-Regu... https://www.libreoffice.org/fonts/Lato-Regular.woff2 — 200 — 179.3 KiB — 578 ms — h2https://www.libreoffice.org/fonts/Lato-Black.woff2www.libreoffice.org/fonts/Lato-Blac... https://www.libreoffice.org/fonts/Lato-Black.woff2 — 200 — 173.4 KiB — 590 ms — h2https://www.libreoffice.org/fonts/Lato-Bold.woff2www.libreoffice.org/fonts/Lato-Bold... https://www.libreoffice.org/fonts/Lato-Bold.woff2 — 200 — 181.4 KiB — 733 ms — h2https://www.libreoffice.org/fonts/Lato-BoldItalic.woff2www.libreoffice.org/fonts/Lato-Bold... https://www.libreoffice.org/fonts/Lato-BoldItalic.woff2 — 200 — 189.6 KiB — 734 ms — h2https://www.libreoffice.org/index.jsonwww.libreoffice.org/index.json https://www.libreoffice.org/index.json — 200 — 79.6 KiB — 463 ms — h2https://www.libreoffice.org/js/platform_detector.jswww.libreoffice.org/js/platform_det... https://www.libreoffice.org/js/platform_detector.js — 200 — 1.6 KiB — 166 ms — h2https://www.libreoffice.org/js/download.jswww.libreoffice.org/js/download.js https://www.libreoffice.org/js/download.js — 200 — 2.5 KiB — 168 ms — h2https://www.libreoffice.org/js/community_map.jswww.libreoffice.org/js/community_ma... https://www.libreoffice.org/js/community_map.js — 200 — 6.1 KiB — 170 ms — h2https://www.libreoffice.org/media/libo-calc.svgwww.libreoffice.org/media/libo-calc... https://www.libreoffice.org/media/libo-calc.svg — 200 — 1.2 KiB — 174 ms — h2https://www.libreoffice.org/media/libo-writer.svgwww.libreoffice.org/media/libo-writ... https://www.libreoffice.org/media/libo-writer.svg — 200 — 1.3 KiB — 177 ms — h2https://www.libreoffice.org/media/screenshot_writer.pngwww.libreoffice.org/media/screensho... https://www.libreoffice.org/media/screenshot_writer.png — 200 — 113.8 KiB — 179 ms — h2https://piwik.documentfoundation.org/piwik.jspiwik.documentfoundation.org/piwik.... https://piwik.documentfoundation.org/piwik.js — 200 — 25.5 KiB — 1.2 s — h2
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 1.1 s LCP 1.3 shttps://libreoffice.org// https://libreoffice.org/ — 301 — 82 B — 657 ms — h2https://www.libreoffice.org/www.libreoffice.org/ https://www.libreoffice.org/ — 200 — 6.6 KiB — 174 ms — h2https://www.libreoffice.org/css/normalize.csswww.libreoffice.org/css/normalize.c... https://www.libreoffice.org/css/normalize.css — 200 — 2.5 KiB — 165 ms — h2https://www.libreoffice.org/css/default.csswww.libreoffice.org/css/default.css https://www.libreoffice.org/css/default.css — 200 — 9.4 KiB — 166 ms — h2https://www.libreoffice.org/css/leaflet.csswww.libreoffice.org/css/leaflet.css https://www.libreoffice.org/css/leaflet.css — 200 — 4.7 KiB — 324 ms — h2https://www.libreoffice.org/media/libreoffice-tdf-logo.svgwww.libreoffice.org/media/libreoffi... https://www.libreoffice.org/media/libreoffice-tdf-logo.svg — 200 — 4.8 KiB — 326 ms — h2https://www.libreoffice.org/media/screenshot_writer_hero.pngwww.libreoffice.org/media/screensho... https://www.libreoffice.org/media/screenshot_writer_hero.png — 200 — 97.4 KiB — 645 ms — h2https://www.libreoffice.org/js/flexsearch.jswww.libreoffice.org/js/flexsearch.j... https://www.libreoffice.org/js/flexsearch.js — 200 — 12.2 KiB — 641 ms — h2https://www.libreoffice.org/js/fastsearch.jswww.libreoffice.org/js/fastsearch.j... https://www.libreoffice.org/js/fastsearch.js — 200 — 2.4 KiB — 483 ms — h2https://www.libreoffice.org/js/libreoffice.jswww.libreoffice.org/js/libreoffice.... https://www.libreoffice.org/js/libreoffice.js — 200 — 3.1 KiB — 485 ms — h2https://www.libreoffice.org/js/matomo.jswww.libreoffice.org/js/matomo.js https://www.libreoffice.org/js/matomo.js — 200 — 994 B — 329 ms — h2https://www.libreoffice.org/js/leaflet.jswww.libreoffice.org/js/leaflet.js https://www.libreoffice.org/js/leaflet.js — 200 — 51.2 KiB — 345 ms — h2https://www.libreoffice.org/media/subtle-prism.svgwww.libreoffice.org/media/subtle-pr... https://www.libreoffice.org/media/subtle-prism.svg — 200 — 1.7 KiB — 280 ms — h2https://www.libreoffice.org/media/libo-math.svgwww.libreoffice.org/media/libo-math... https://www.libreoffice.org/media/libo-math.svg — 200 — 1.3 KiB — 282 ms — h2https://www.libreoffice.org/media/libo-draw.svgwww.libreoffice.org/media/libo-draw... https://www.libreoffice.org/media/libo-draw.svg — 200 — 1.2 KiB — 284 ms — h2https://www.libreoffice.org/media/searchicon.pngwww.libreoffice.org/media/searchico... https://www.libreoffice.org/media/searchicon.png — 200 — 1.4 KiB — 286 ms — h2https://www.libreoffice.org/media/libo-impress.svgwww.libreoffice.org/media/libo-impr... https://www.libreoffice.org/media/libo-impress.svg — 200 — 1.3 KiB — 288 ms — h2https://www.libreoffice.org/media/libo-base.svgwww.libreoffice.org/media/libo-base... https://www.libreoffice.org/media/libo-base.svg — 200 — 1.2 KiB — 290 ms — h2https://www.libreoffice.org/fonts/Lato-Regular.woff2www.libreoffice.org/fonts/Lato-Regu... https://www.libreoffice.org/fonts/Lato-Regular.woff2 — 200 — 179.3 KiB — 578 ms — h2https://www.libreoffice.org/fonts/Lato-Black.woff2www.libreoffice.org/fonts/Lato-Blac... https://www.libreoffice.org/fonts/Lato-Black.woff2 — 200 — 173.4 KiB — 590 ms — h2https://www.libreoffice.org/fonts/Lato-Bold.woff2www.libreoffice.org/fonts/Lato-Bold... https://www.libreoffice.org/fonts/Lato-Bold.woff2 — 200 — 181.4 KiB — 733 ms — h2https://www.libreoffice.org/fonts/Lato-BoldItalic.woff2www.libreoffice.org/fonts/Lato-Bold... https://www.libreoffice.org/fonts/Lato-BoldItalic.woff2 — 200 — 189.6 KiB — 734 ms — h2https://www.libreoffice.org/index.jsonwww.libreoffice.org/index.json https://www.libreoffice.org/index.json — 200 — 79.6 KiB — 463 ms — h2https://www.libreoffice.org/js/platform_detector.jswww.libreoffice.org/js/platform_det... https://www.libreoffice.org/js/platform_detector.js — 200 — 1.6 KiB — 166 ms — h2https://www.libreoffice.org/js/download.jswww.libreoffice.org/js/download.js https://www.libreoffice.org/js/download.js — 200 — 2.5 KiB — 168 ms — 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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 515ms · 58KB · €1/mo
Unattributable
Other
Costly
Execution 257ms
Transfer 0 KB
Monthly Cost €1/mo
www.libreoffice.org
Other
Optional
Execution 156ms
Transfer 7 KB
Monthly Cost €0/mo
www.libreoffice.org
Other
Optional
Execution 102ms
Transfer 51 KB
Unused 61%
Monthly Cost €0/mo

These scripts may cost more than they're worth

  • Unattributable adds 257ms and costs ~€1/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

Unattributable takes 257ms 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

61% of www.libreoffice.org's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

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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