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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
85
GRADE
B
FIX
0
REVIEW
6
PASS
9
INFO
2

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.
98
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
83
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.

1.30 s

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

1.40 s

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

5 ms

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

0.018

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

1.30 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.

5.22 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
9 PASS 6 REVIEW
B
Page Weight Budget
1.3 MB transferred, 57 requests
REVIEW
1.3 MB transferred, 57 requests
Info::
Page weighs 2.0 MB (1.3 MB transferred)
Info::
Fonts are 329 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 329 KB
Info::
57 HTTP requests
Info::
Estimated 0.28 g CO2 per page load
1.3 MB / 2.4 MB budget
1.3 MB transferred
57 requests
0.28 g CO2 per page load
Images 873.6 KiB 63%
Fonts 329.1 KiB 24%
JavaScript 129.5 KiB 9%
CSS 30.4 KiB 2%
HTML 10.5 KiB 1%
Other 8.0 KiB 1%
Other 989 B 0%
Other 226 B 0%
0 2.4 MB 4.9 MB
Under budget

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

B
Third-Party Impact
41% third-party, 0 ms blocking
REVIEW
41% third-party, 0 ms blocking
Info::
Third-party code accounts for 41% of page weight (566.5 KiB of 1.3 MiB)
Info::
Third-party blocking time is low (0 ms)
59%
41%
First-party Third-party
C
Image Optimization
Action
35 images, 0 KB saveable
REVIEW
35 images, 0 KB saveable
Warning::
https://apache.org/images/mastodon-icon.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://apache.org/images/slack-icon.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://apache.org/images/linkedin-icon.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://apache.org/images/youtube-icon.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://apache.org/images/x-icon.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://apache.org/images/asf_logo_full_horizontal... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://apache.org/images/bluesky-icon.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://apache.org/images/github-mark-white.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://apache.org/images/asflogo_horizontal_color... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
35 images 874 KB
0 oversized -0 KB
27 legacy format
9 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

C
JS Execution Cost
Action
1214ms total JS execution
REVIEW
1214ms total JS execution
Warning::
https://apache.org/: 761ms CPU time
Warning::
Unattributable: 386ms CPU time
Info::
https://apache.org/js/jquery.min.js: 68ms CPU time
Info::
Third-party scripts: 386ms (32% of total)

Main Thread Breakdown

Other 41% Style & Layout 26% Script Evaluation 14% Rendering 11% Script Parsing & Compilation 5% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://apache.org/761ms69ms19ms1st
Unattributable386ms14ms0ms3rd
https://apache.org/js/jquery.min.js68ms47ms14ms1st
C
Page Weight Inventory
Action
57 resources · 1.3 MB · 38 KB savings available
REVIEW
57 resources · 1.3 MB · 38 KB savings available
Warning::
Page weight 358 KB over 1MB target
Got: 1.3 MB Expected: ≤ 1 MB
Warning::
20 third-party resources (41% of weight)
57 resources · 1.3 MiB · 20 third-party 358.2 KiB over 1MB target
Image 64% · 881.6 KiB
Font 24% · 329.1 KiB
JavaScript 9% · 129.5 KiB
CSS 2% · 30.4 KiB
Document 1% · 10.5 KiB
Other 0% · 1.2 KiB

~38.4 KiB of savings available

Remove unused JavaScript: 38.4 KiB
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+
Font Loading
5 fonts (329 KB)
PASS
5 fonts (329 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

329 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 FCP 1.3 s LCP 1.4 shttps://apache.org/css/OpenSans-Bold.ttfOpenSans-Bold.ttf https://apache.org/css/OpenSans-Bold.ttf — 74.5 KiB — 83 ms — font-display: swaphttps://apache.org/css/OpenSans-Regular.ttfOpenSans-Regular.ttf https://apache.org/css/OpenSans-Regular.ttf — 77.1 KiB — 19 ms — font-display: swaphttps://apache.org/css/Montserrat-ExtraBold.ttfMontserrat-ExtraBold.ttf https://apache.org/css/Montserrat-ExtraBold.ttf — 145.2 KiB — 19 ms — font-display: swaphttps://apache.org/css/JTUHjIg1_i6t8kCHKm4532VJOt5-QNFgpCu173w5aX8.ttfJTUHjIg1_i6t8kCHKm4532V... https://apache.org/css/JTUHjIg1_i6t8kCHKm4532VJOt5-QNFgpCu173w5aX8.ttf — 16.1 KiB — 59 ms — font-display: swaphttps://apache.org/css/JTUHjIg1_i6t8kCHKm4532VJOt5-QNFgpCs16Hw5aX8.ttfJTUHjIg1_i6t8kCHKm4532V... https://apache.org/css/JTUHjIg1_i6t8kCHKm4532VJOt5-QNFgpCs16Hw5aX8.ttf — 16.2 KiB — 14 ms — font-display: swap
OpenSans-Bold.ttf ttf swap
Size 75 KB
Load time 83 ms
Start 131 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
OpenSans-Regular.ttf ttf swap
Size 77 KB
Load time 19 ms
Start 131 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Montserrat-ExtraBold.ttf ttf swap
Size 145 KB
Load time 19 ms
Start 131 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
JTUHjIg1_i6t8kCHKm4532V... ttf swap
Size 16 KB
Load time 59 ms
Start 187 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
JTUHjIg1_i6t8kCHKm4532V... ttf swap
Size 16 KB
Load time 14 ms
Start 189 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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 ~171 KB and ~342 ms

A
JS Bundles
6 scripts, 38 KB unused
PASS
6 scripts, 38 KB unused
Warning::
https://analytics.apache.org/matomo.js: 38 KB unused (59%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://apache.org/js/bootstrap.js: unminified — 4 KB could be saved
Info::
Total unused JavaScript: 38 KB
38 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://analytics.apache.org/matomo.js66 KB38 KB (59%)✓3rd
https://www.apachecon.com/event-images/snippet.js0 KB—✓3rd
https://apache.org/js/jquery.min.js30 KB—✓1st
https://apache.org/js/bootstrap.js11 KB—✗1st
https://apache.org/js/slideshow.js1 KB—✓1st
https://apache.org/_pagefind/pagefind-ui.js22 KB—✓1st

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+
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+
HTTP Caching
max-age=3600 (1 hour)
PASS
max-age=3600 (1 hour)
Info::
Cache-Control header is set
Got: max-age=3600
Info::
Effective TTL: 1 hour (max-age=3600)
Info::
ETag present — enables conditional (304) responses
Info::
Last-Modified header present
Cache-Control

max-age=3600

DirectiveValueMeaning
max-age3600Cache for 1 hour
Effective TTL: 3600 seconds
Network Waterfall
57 requests over 821ms
INFO
0 ms 500 ms 1.0 s FCP 1.3 s LCP 1.4 shttps://apache.org// https://apache.org/ — 200 — 10.5 KiB — 8 ms — h2https://www.apachecon.com/event-images/snippet.jswww.apachecon.com/event-images/snip... https://www.apachecon.com/event-images/snippet.js — -1 — 0 B — 223 ms — https://apache.org/css/Montserrat-300-600-800.css/css/Montserrat-300-600-800.css https://apache.org/css/Montserrat-300-600-800.css — 200 — 375 B — 60 ms — h2https://apache.org/css/OpenSans.css/css/OpenSans.css https://apache.org/css/OpenSans.css — 200 — 278 B — 60 ms — h2https://apache.org/css/min.bootstrap.css/css/min.bootstrap.css https://apache.org/css/min.bootstrap.css — 200 — 18.9 KiB — 63 ms — h2https://apache.org/css/styles.css/css/styles.css https://apache.org/css/styles.css — 200 — 7.2 KiB — 4 ms — h2https://apache.org/css/new-ui.css/css/new-ui.css https://apache.org/css/new-ui.css — 200 — 985 B — 57 ms — h2https://apache.org/_pagefind/pagefind-ui.css/_pagefind/pagefind-ui.css https://apache.org/_pagefind/pagefind-ui.css — 200 — 2.7 KiB — 60 ms — h2https://apache.org/js/jquery.min.js/js/jquery.min.js https://apache.org/js/jquery.min.js — 200 — 29.9 KiB — 8 ms — h2https://apache.org/images/asflogo_horizontal_color.svg/images/asflogo_horizontal_color.sv... https://apache.org/images/asflogo_horizontal_color.svg — 200 — 3.1 KiB — 61 ms — h2https://apache.org/images/oakleaf.svg/images/oakleaf.svg https://apache.org/images/oakleaf.svg — 200 — 2.1 KiB — 6 ms — h2https://apache.org/js/bootstrap.js/js/bootstrap.js https://apache.org/js/bootstrap.js — 200 — 11.1 KiB — 5 ms — h2https://apache.org/js/slideshow.js/js/slideshow.js https://apache.org/js/slideshow.js — 200 — 556 B — 4 ms — h2https://apache.org/favicons/manifest.json/favicons/manifest.json https://apache.org/favicons/manifest.json — 200 — 989 B — 8 ms — h2https://apache.org/_pagefind/pagefind-ui.js/_pagefind/pagefind-ui.js https://apache.org/_pagefind/pagefind-ui.js — 200 — 22.2 KiB — 4 ms — h2https://apache.org/images/asf_logo_full_horizontal_white.svg/images/asf_logo_full_horizontal_wh... https://apache.org/images/asf_logo_full_horizontal_white.svg — 200 — 5.4 KiB — 62 ms — h2https://apache.org/images/slack-icon.svg/images/slack-icon.svg https://apache.org/images/slack-icon.svg — 200 — 985 B — 66 ms — h2https://apache.org/images/github-mark-white.svg/images/github-mark-white.svg https://apache.org/images/github-mark-white.svg — 200 — 742 B — 63 ms — h2https://apache.org/images/linkedin-icon.png/images/linkedin-icon.png https://apache.org/images/linkedin-icon.png — 200 — 547 B — 59 ms — h2https://apache.org/images/youtube-icon.svg/images/youtube-icon.svg https://apache.org/images/youtube-icon.svg — 200 — 1.3 KiB — 66 ms — h2https://apache.org/images/x-icon.svg/images/x-icon.svg https://apache.org/images/x-icon.svg — 200 — 473 B — 63 ms — h2https://apache.org/images/bluesky-icon.png/images/bluesky-icon.png https://apache.org/images/bluesky-icon.png — 200 — 6.0 KiB — 58 ms — h2https://apache.org/images/mastodon-icon.png/images/mastodon-icon.png https://apache.org/images/mastodon-icon.png — 200 — 1.8 KiB — 5 ms — h2https://analytics.apache.org/matomo.jsanalytics.apache.org/matomo.js https://analytics.apache.org/matomo.js — 200 — 65.8 KiB — 554 ms — http/1.1https://apache.org/css/OpenSans-Bold.ttf/css/OpenSans-Bold.ttf https://apache.org/css/OpenSans-Bold.ttf — 200 — 74.5 KiB — 83 ms — h2https://apache.org/css/OpenSans-Regular.ttf/css/OpenSans-Regular.ttf https://apache.org/css/OpenSans-Regular.ttf — 200 — 77.1 KiB — 19 ms — h2https://apache.org/css/Montserrat-ExtraBold.ttf/css/Montserrat-ExtraBold.ttf https://apache.org/css/Montserrat-ExtraBold.ttf — 200 — 145.2 KiB — 19 ms — h2https://www.apache.org/logos/res/grails/default.pngwww.apache.org/logos/res/grails/def... https://www.apache.org/logos/res/grails/default.png — 200 — 42.8 KiB — 25 ms — h2https://www.apache.org/logos/res/johnzon/default.pngwww.apache.org/logos/res/johnzon/de... https://www.apache.org/logos/res/johnzon/default.png — 200 — 32.2 KiB — 24 ms — h2https://www.apache.org/logos/res/hop/default.pngwww.apache.org/logos/res/hop/defaul... https://www.apache.org/logos/res/hop/default.png — 200 — 41.8 KiB — 36 ms — h2
0 ms 500 ms 1.0 s FCP 1.3 s LCP 1.4 shttps://apache.org// https://apache.org/ — 200 — 10.5 KiB — 8 ms — h2https://www.apachecon.com/event-images/snippet.jswww.apachecon.com/event-images/snip... https://www.apachecon.com/event-images/snippet.js — -1 — 0 B — 223 ms — https://apache.org/css/Montserrat-300-600-800.css/css/Montserrat-300-600-800.css https://apache.org/css/Montserrat-300-600-800.css — 200 — 375 B — 60 ms — h2https://apache.org/css/OpenSans.css/css/OpenSans.css https://apache.org/css/OpenSans.css — 200 — 278 B — 60 ms — h2https://apache.org/css/min.bootstrap.css/css/min.bootstrap.css https://apache.org/css/min.bootstrap.css — 200 — 18.9 KiB — 63 ms — h2https://apache.org/css/styles.css/css/styles.css https://apache.org/css/styles.css — 200 — 7.2 KiB — 4 ms — h2https://apache.org/css/new-ui.css/css/new-ui.css https://apache.org/css/new-ui.css — 200 — 985 B — 57 ms — h2https://apache.org/_pagefind/pagefind-ui.css/_pagefind/pagefind-ui.css https://apache.org/_pagefind/pagefind-ui.css — 200 — 2.7 KiB — 60 ms — h2https://apache.org/js/jquery.min.js/js/jquery.min.js https://apache.org/js/jquery.min.js — 200 — 29.9 KiB — 8 ms — h2https://apache.org/images/asflogo_horizontal_color.svg/images/asflogo_horizontal_color.sv... https://apache.org/images/asflogo_horizontal_color.svg — 200 — 3.1 KiB — 61 ms — h2https://apache.org/images/oakleaf.svg/images/oakleaf.svg https://apache.org/images/oakleaf.svg — 200 — 2.1 KiB — 6 ms — h2https://apache.org/js/bootstrap.js/js/bootstrap.js https://apache.org/js/bootstrap.js — 200 — 11.1 KiB — 5 ms — h2https://apache.org/js/slideshow.js/js/slideshow.js https://apache.org/js/slideshow.js — 200 — 556 B — 4 ms — h2https://apache.org/favicons/manifest.json/favicons/manifest.json https://apache.org/favicons/manifest.json — 200 — 989 B — 8 ms — h2https://apache.org/_pagefind/pagefind-ui.js/_pagefind/pagefind-ui.js https://apache.org/_pagefind/pagefind-ui.js — 200 — 22.2 KiB — 4 ms — h2https://apache.org/images/asf_logo_full_horizontal_white.svg/images/asf_logo_full_horizontal_wh... https://apache.org/images/asf_logo_full_horizontal_white.svg — 200 — 5.4 KiB — 62 ms — h2https://apache.org/images/slack-icon.svg/images/slack-icon.svg https://apache.org/images/slack-icon.svg — 200 — 985 B — 66 ms — h2https://apache.org/images/github-mark-white.svg/images/github-mark-white.svg https://apache.org/images/github-mark-white.svg — 200 — 742 B — 63 ms — h2https://apache.org/images/linkedin-icon.png/images/linkedin-icon.png https://apache.org/images/linkedin-icon.png — 200 — 547 B — 59 ms — h2https://apache.org/images/youtube-icon.svg/images/youtube-icon.svg https://apache.org/images/youtube-icon.svg — 200 — 1.3 KiB — 66 ms — h2https://apache.org/images/x-icon.svg/images/x-icon.svg https://apache.org/images/x-icon.svg — 200 — 473 B — 63 ms — h2https://apache.org/images/bluesky-icon.png/images/bluesky-icon.png https://apache.org/images/bluesky-icon.png — 200 — 6.0 KiB — 58 ms — h2https://apache.org/images/mastodon-icon.png/images/mastodon-icon.png https://apache.org/images/mastodon-icon.png — 200 — 1.8 KiB — 5 ms — h2https://analytics.apache.org/matomo.jsanalytics.apache.org/matomo.js https://analytics.apache.org/matomo.js — 200 — 65.8 KiB — 554 ms — http/1.1https://apache.org/css/OpenSans-Bold.ttf/css/OpenSans-Bold.ttf https://apache.org/css/OpenSans-Bold.ttf — 200 — 74.5 KiB — 83 ms — h2https://apache.org/css/OpenSans-Regular.ttf/css/OpenSans-Regular.ttf https://apache.org/css/OpenSans-Regular.ttf — 200 — 77.1 KiB — 19 ms — h2https://apache.org/css/Montserrat-ExtraBold.ttf/css/Montserrat-ExtraBold.ttf https://apache.org/css/Montserrat-ExtraBold.ttf — 200 — 145.2 KiB — 19 ms — h2https://www.apache.org/logos/res/grails/default.pngwww.apache.org/logos/res/grails/def... https://www.apache.org/logos/res/grails/default.png — 200 — 42.8 KiB — 25 ms — h2https://www.apache.org/logos/res/johnzon/default.pngwww.apache.org/logos/res/johnzon/de... 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32% of JavaScript execution is third-party
First-party Third-party 386ms · 0KB · €4/mo
Unattributable
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Costly
Execution 386ms
Transfer 0 KB
Monthly Cost €4/mo

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