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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
92
GRADE
A
FIX
1
REVIEW
4
PASS
10
INFO
2

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

Mobile Desktop
78
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
90
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
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.

3.24 s

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

4.42 s

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

6 ms

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

0.000

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

3.27 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.

4.44 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
10 PASS 4 REVIEW 1 FIX
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
10 images, 0 KB saveable
REVIEW
10 images, 0 KB saveable
Warning::
https://launchpad.net/@@/question-homepage.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://launchpad.net/@@/product-logo is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://launchpadlibrarian.net/52042558/os64.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://launchpadlibrarian.net/606381979/CoF%2064p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://launchpad.net/@@/add-homepage.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://launchpad.net/@@/tour-homepage.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://launchpadlibrarian.net/66795469/ink-lp-log... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://launchpadlibrarian.net/600817174/Canonical... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://launchpadlibrarian.net/250357498/OpenShot-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://launchpad.net/@@/launchpad-logo-and-name.s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
10 images 47 KB
0 oversized -0 KB
10 legacy format
10 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

B
JS Execution Cost
650ms total JS execution
REVIEW
650ms total JS execution
Warning::
https://launchpad.net/: 349ms CPU time
Info::
Unattributable: 151ms CPU time
Info::
https://launchpad.net/+combo/rev866d07beecca8ac2e3...: 150ms CPU time
Info::
Third-party scripts: 151ms (23% of total)

Main Thread Breakdown

Script Evaluation 35% Other 31% Style & Layout 18% Script Parsing & Compilation 8% Parse HTML & CSS 6%
ScriptTotalScriptingParse/CompileParty
https://launchpad.net/349ms133ms5ms1st
Unattributable151ms6ms0ms3rd
https://launchpad.net/+combo/rev866d07beecca8ac2e3326342adf6c1740cd3e7b3/?yui/yui/yui-min.js&lp/meta.js&yui/loader/loader-min.js150ms103ms21ms1st
B
JS Bundles
4 scripts, 70 KB unused
REVIEW
4 scripts, 70 KB unused
Warning::
https://launchpad.net/+combo/rev866d07beecca8ac2e3...: 47 KB unused (82%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://launchpad.net/+combo/rev866d07beecca8ac2e3...: 23 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 70 KB
70 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://launchpad.net/+combo/rev866d07beecca8ac2e3326342adf6c1740cd3e7b3/?yui/anim-base/anim-base-min.js&yui/anim-color/anim-color-min.js&yui/anim-xy/anim-xy-min.js&yui/anim-curve/anim-curve-min.js&yui/anim-easing/anim-easing-min.js&yui/anim-node-plugin/anim-node-plugin-min.js&yui/anim-scroll/anim-scroll-min.js&lp/app/effects/effects-min.js&lp/app/expander-min.js&lp/app/lp-min.js&lp/app/foldables-min.js&lp/app/sorttable/sorttable-min.js&yui/widget-stdmod/widget-stdmod-min.js&yui/widget-position/widget-position-min.js&yui/widget-position-align/widget-position-align-min.js&yui/widget-stack/widget-stack-min.js&yui/widget-position-constrain/widget-position-constrain-min.js&yui/overlay/overlay-min.js&lp/app/overlay/overlay-min.js&yui/querystring-stringify-simple/querystring-stringify-simple-min.js&yui/io-base/io-base-min.js&yui/datatype-xml-parse/datatype-xml-parse-min.js&yui/io-xdr/io-xdr-min.js&yui/io-form/io-form-min.js&yui/io-upload-iframe/io-upload-iframe-min.js&yui/queue-promote/queue-promote-min.js&yui/io-queue/io-queue-min.js&lp/app/inlinehelp/inlinehelp-min.js&yui/json-parse/json-parse-min.js&yui/json-stringify/json-stringify-min.js&yui/array-extras/array-extras-min.js&yui/querystring-parse/querystring-parse-min.js&yui/querystring-stringify/querystring-stringify-min.js&lp/app/client-min.js&lp/app/lp-links-min.js&lp/app/mustache-min.js&lp/app/formoverlay/formoverlay-min.js&lp/app/extras/extras-min.js&lp/app/anim/anim-min.js&lp/app/choiceedit/choiceedit-min.js&yui/dump/dump-min.js&lp/app/ui/ui-min.js&lp/app/activator/activator-min.js&yui/escape/escape-min.js&yui/plugin/plugin-min.js&lp/app/picker/picker-min.js&lp/app/client-min.js&yui/event-simulate/event-simulate-min.js&yui/async-queue/async-queue-min.js&yui/gesture-simulate/gesture-simulate-min.js&yui/node-event-simulate/node-event-simulate-min.js&lp/app/choice-min.js&lp/app/picker/team-min.js&lp/app/picker/person_picker-min.js&lp/app/picker/picker_patcher-min.js&yui/substitute/substitute-min.js&lp/app/errors-min.js58 KB47 KB (82%)✓1st
https://launchpad.net/+combo/rev866d07beecca8ac2e3326342adf6c1740cd3e7b3/?yui/oop/oop-min.js&yui/attribute-core/attribute-core-min.js&yui/event-custom-base/event-custom-base-min.js&yui/event-custom-complex/event-custom-complex-min.js&yui/attribute-observable/attribute-observable-min.js&yui/attribute-extras/attribute-extras-min.js&yui/attribute-base/attribute-base-min.js&yui/base-core/base-core-min.js&yui/base-observable/base-observable-min.js&yui/base-base/base-base-min.js&yui/pluginhost-base/pluginhost-base-min.js&yui/pluginhost-config/pluginhost-config-min.js&yui/base-pluginhost/base-pluginhost-min.js&yui/base-build/base-build-min.js&yui/dom-core/dom-core-min.js&yui/dom-base/dom-base-min.js&yui/selector-native/selector-native-min.js&yui/selector/selector-min.js&yui/node-core/node-core-min.js&yui/node-base/node-base-min.js&yui/event-base/event-base-min.js&yui/event-delegate/event-delegate-min.js&yui/node-event-delegate/node-event-delegate-min.js&yui/node-pluginhost/node-pluginhost-min.js&yui/color-base/color-base-min.js&yui/dom-style/dom-style-min.js&yui/dom-screen/dom-screen-min.js&yui/node-screen/node-screen-min.js&yui/node-style/node-style-min.js&yui/event-synthetic/event-synthetic-min.js&yui/event-focus/event-focus-min.js&yui/intl/intl-min.js&yui/console/lang/console_en.js&yui/attribute-complex/attribute-complex-min.js&yui/classnamemanager/classnamemanager-min.js&yui/widget-base/widget-base-min.js&yui/widget-htmlparser/widget-htmlparser-min.js&yui/widget-skin/widget-skin-min.js&yui/widget-uievents/widget-uievents-min.js&yui/console/console-min.js&yui/event-mousewheel/event-mousewheel-min.js&yui/event-mouseenter/event-mouseenter-min.js&yui/event-key/event-key-min.js&yui/event-resize/event-resize-min.js&yui/event-hover/event-hover-min.js&yui/event-outside/event-outside-min.js&yui/event-touch/event-touch-min.js&yui/event-move/event-move-min.js&yui/event-flick/event-flick-min.js&yui/event-valuechange/event-valuechange-min.js&yui/event-tap/event-tap-min.js&yui/cookie/cookie-min.js43 KB23 KB (54%)✓1st
https://launchpad.net/+combo/rev866d07beecca8ac2e3326342adf6c1740cd3e7b3/?yui/yui/yui-min.js&lp/meta.js&yui/loader/loader-min.js45 KB—✓1st
https://launchpad.net/+combo/rev866d07beecca8ac2e3326342adf6c1740cd3e7b3/?lp/bugs/bug_subscription_portlet-min.js&lp/app/confirmationoverlay/confirmationoverlay-min.js&lp/bugs/bug_picker-min.js&lp/bugs/bugtask_index-min.js&lp/app/information_type-min.js&lp/bugs/duplicates-min.js&lp/app/lp-names-min.js&lp/app/subscribers/subscribers_list-min.js&lp/bugs/subscribers-min.js&lp/app/ellipsis-min.js&lp/code/branchmergeproposal.diff-min.js&yui/view/view-min.js&lp/app/ui/banner-min.js&lp/app/views/global-min.js23 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

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

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

Green Hosting

No green hosting detected

A+
Page Weight Budget
405 KB transferred, 20 requests
PASS
405 KB transferred, 20 requests
Info::
Page weighs 1.3 MB (405 KB transferred)
Info::
20 HTTP requests
Info::
Estimated 0.08 g CO2 per page load
405 KB / 2.4 MB budget
405 KB transferred
20 requests
0.08 g CO2 per page load
JavaScript 168.6 KiB 42%
Fonts 93.5 KiB 23%
CSS 81.2 KiB 20%
Images 47.3 KiB 12%
Other 7.7 KiB 2%
HTML 5.8 KiB 1%
Other 937 B 0%
0 2.4 MB 4.9 MB
Under budget
A
Third-Party Impact
29% third-party, 0 ms blocking
PASS
29% third-party, 0 ms blocking
Info::
Third-party code accounts for 29% of page weight (118.2 KiB of 405.0 KiB)
Info::
Third-party blocking time is low (0 ms)
71%
29%
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+
Font Loading
1 fonts (93 KB)
PASS
1 fonts (93 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

93 KB total

Render-blocking

0

of 1

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 3.2 s LCP 4.4 shttps://assets.ubuntu.com/v1/f1ea362b-Ubuntu%5Bwdth,wght%5D-latin-v0.896a.woff2f1ea362b-Ubuntu%5Bwdth,... https://assets.ubuntu.com/v1/f1ea362b-Ubuntu%5Bwdth,wght%5D-latin-v0.896a.woff2 — 93.5 KiB — 170 ms — font-display: swap
f1ea362b-Ubuntu%5Bwdth,... woff2 swap
Size 93 KB
Load time 170 ms
Start 356 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+
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
20 resources · 405 KB · 70 KB savings available
PASS
20 resources · 405 KB · 70 KB savings available
Info::
Within 1MB page-weight target
Got: 405 KB
Info::
~70 KB of savings available
Info::
6 third-party resources (29% of weight)
20 resources · 405.0 KiB · 6 third-party Within 1MB page-weight target
JavaScript 42% · 168.6 KiB
Font 23% · 93.5 KiB
CSS 20% · 81.2 KiB
Image 14% · 55.0 KiB
Document 1% · 5.8 KiB
Other 0% · 937 B

~70.1 KiB of savings available

Remove unused JavaScript: 70.1 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
Network Waterfall
20 requests over 580ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 3.2 s LCP 4.4 shttps://launchpad.net// https://launchpad.net/ — 200 — 5.8 KiB — 161 ms — http/1.1https://launchpad.net/+icing/rev866d07beecca8ac2e3326342adf6c1740cd3e7b3/combo.css/+icing/rev866d07beecca8ac2e3326342... https://launchpad.net/+icing/rev866d07beecca8ac2e3326342adf6c1740cd3e7b3/combo.css — 200 — 28.2 KiB — 64 ms — http/1.1https://launchpad.net/+combo/rev866d07beecca8ac2e3326342adf6c1740cd3e7b3/?yui/yui/yui-min.js&lp/meta.js&yui/loader/loader-min.js/+combo/rev866d07beecca8ac2e3326342... https://launchpad.net/+combo/rev866d07beecca8ac2e3326342adf6c1740cd3e7b3/?yui/yui/yui-min.js&lp/meta.js&yui/loader/loader-min.js — 200 — 45.2 KiB — 99 ms — http/1.1https://launchpad.net/+icing/vanilla-framework-version-4.7.0.min.css/+icing/vanilla-framework-version-4... https://launchpad.net/+icing/vanilla-framework-version-4.7.0.min.css — 200 — 53.0 KiB — 142 ms — http/1.1https://launchpad.net/@@/launchpad-logo-and-name.svg/@@/launchpad-logo-and-name.svg https://launchpad.net/@@/launchpad-logo-and-name.svg — 200 — 13.5 KiB — 104 ms — http/1.1https://launchpad.net/@@/add-homepage.png/@@/add-homepage.png https://launchpad.net/@@/add-homepage.png — 200 — 896 B — 105 ms — http/1.1https://launchpad.net/@@/tour-homepage.png/@@/tour-homepage.png https://launchpad.net/@@/tour-homepage.png — 200 — 2.6 KiB — 30 ms — http/1.1https://launchpad.net/@@/question-homepage.png/@@/question-homepage.png https://launchpad.net/@@/question-homepage.png — 200 — 1.5 KiB — 27 ms — http/1.1https://launchpad.net/@@/product-logo/@@/product-logo https://launchpad.net/@@/product-logo — 200 — 4.1 KiB — 37 ms — http/1.1https://launchpad.net/@@/site.webmanifest?v=2022/@@/site.webmanifest?v=2022 https://launchpad.net/@@/site.webmanifest?v=2022 — 200 — 937 B — 79 ms — http/1.1https://launchpadlibrarian.net/66795469/ink-lp-logo.pnglaunchpadlibrarian.net/66795469/ink... https://launchpadlibrarian.net/66795469/ink-lp-logo.png — 200 — 6.2 KiB — 131 ms — http/1.1https://launchpadlibrarian.net/600817174/Canonical_Launchpad_icon_64px.pnglaunchpadlibrarian.net/600817174/Ca... https://launchpadlibrarian.net/600817174/Canonical_Launchpad_icon_64px.png — 200 — 2.2 KiB — 123 ms — http/1.1https://launchpadlibrarian.net/250357498/OpenShot-2-Logo.pnglaunchpadlibrarian.net/250357498/Op... https://launchpadlibrarian.net/250357498/OpenShot-2-Logo.png — 200 — 7.5 KiB — 122 ms — http/1.1https://launchpadlibrarian.net/52042558/os64.pnglaunchpadlibrarian.net/52042558/os6... https://launchpadlibrarian.net/52042558/os64.png — 200 — 5.0 KiB — 131 ms — http/1.1https://launchpadlibrarian.net/606381979/CoF%2064px.pnglaunchpadlibrarian.net/606381979/Co... https://launchpadlibrarian.net/606381979/CoF%2064px.png — 200 — 3.9 KiB — 128 ms — http/1.1https://launchpad.net/+combo/rev866d07beecca8ac2e3326342adf6c1740cd3e7b3/?yui/oop/oop-min.js&yui/attribute-core/attribute-core-min.js&yui/event-custom-base/event-custom-base-min.js&yui/event-custom-complex/event-custom-complex-min.js&yui/attribute-observable/attribute-observable-min.js&yui/attribute-extras/attribute-extras-min.js&yui/attribute-base/attribute-base-min.js&yui/base-core/base-core-min.js&yui/base-observable/base-observable-min.js&yui/base-base/base-base-min.js&yui/pluginhost-base/pluginhost-base-min.js&yui/pluginhost-config/pluginhost-config-min.js&yui/base-pluginhost/base-pluginhost-min.js&yui/base-build/base-build-min.js&yui/dom-core/dom-core-min.js&yui/dom-base/dom-base-min.js&yui/selector-native/selector-native-min.js&yui/selector/selector-min.js&yui/node-core/node-core-min.js&yui/node-base/node-base-min.js&yui/event-base/event-base-min.js&yui/event-delegate/event-delegate-min.js&yui/node-event-delegate/node-event-delegate-min.js&yui/node-pluginhost/node-pluginhost-min.js&yui/color-base/color-base-min.js&yui/dom-style/dom-style-min.js&yui/dom-screen/dom-screen-min.js&yui/node-screen/node-screen-min.js&yui/node-style/node-style-min.js&yui/event-synthetic/event-synthetic-min.js&yui/event-focus/event-focus-min.js&yui/intl/intl-min.js&yui/console/lang/console_en.js&yui/attribute-complex/attribute-complex-min.js&yui/classnamemanager/classnamemanager-min.js&yui/widget-base/widget-base-min.js&yui/widget-htmlparser/widget-htmlparser-min.js&yui/widget-skin/widget-skin-min.js&yui/widget-uievents/widget-uievents-min.js&yui/console/console-min.js&yui/event-mousewheel/event-mousewheel-min.js&yui/event-mouseenter/event-mouseenter-min.js&yui/event-key/event-key-min.js&yui/event-resize/event-resize-min.js&yui/event-hover/event-hover-min.js&yui/event-outside/event-outside-min.js&yui/event-touch/event-touch-min.js&yui/event-move/event-move-min.js&yui/event-flick/event-flick-min.js&yui/event-valuechange/event-valuechange-min.js&yui/event-tap/event-tap-min.js&yui/cookie/cookie-min.js/+combo/rev866d07beecca8ac2e3326342... 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— 200 — 42.6 KiB — 105 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
23% of JavaScript execution is third-party
First-party Third-party 151ms · 0KB · $2/mo
Unattributable
Other
Optional
Execution 151ms
Transfer 0 KB
Monthly Cost $2/mo

How third-party costs are calculated

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