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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
5
REVIEW
2
PASS
6
INFO
2

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

Mobile Desktop
76
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
78
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.
92
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.

1.61 s

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

1.94 s

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

175 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.

2.33 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.

5.01 s

Page Load Progression

453 ms
907 ms
1.4 s
1.8 s
2.3 s
2.7 s
3.2 s
3.6 s
Checks
15
6 PASS 2 REVIEW 5 FIX
D
Page Weight Budget
Action
2.4 MB transferred, 52 requests
FIX
2.4 MB transferred, 52 requests
Warning::
Page weighs 6.9 MB (2.4 MB transferred)
Warning::
JavaScript is 846 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 846 KB
Info::
Fonts are 582 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 582 KB
Info::
52 HTTP requests
Info::
Estimated 0.51 g CO2 per page load
2.4 MB / 2.4 MB budget
2.4 MB transferred
52 requests
0.51 g CO2 per page load
JavaScript 846.0 KiB 34%
Other 690.8 KiB 28%
Fonts 582.3 KiB 23%
Images 192.0 KiB 8%
CSS 106.0 KiB 4%
HTML 40.6 KiB 2%
Other 39.8 KiB 2%
Other 6.7 KiB 0%
Other 3.2 KiB 0%
0 2.4 MB 4.9 MB
Over budget

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

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

D
Third-Party Impact
Action
84% third-party, 0 ms blocking
FIX
84% third-party, 0 ms blocking
Warning::
Third-party code accounts for 84% of page weight (2.1 MiB of 2.4 MiB)
Info::
Third-party blocking time is low (0 ms)
16%
84%
First-party Third-party
D
JS Execution Cost
Action
2542ms total JS execution
FIX
2542ms total JS execution
Warning::
https://canonical.com/static/js/dist/homepage_anim...: 1249ms CPU time
Warning::
https://canonical.com/: 558ms CPU time
Info::
Unattributable: 221ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-5LTL...: 153ms CPU time
Info::
https://assets.ubuntu.com/v1/703e23c9-lazysizes+no...: 109ms CPU time
Info::
Third-party scripts: 735ms (29% of total)

Main Thread Breakdown

Script Evaluation 63% Other 20% Style & Layout 7% Script Parsing & Compilation 4% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://canonical.com/static/js/dist/homepage_animations.js?v=cbbe7741249ms1175ms15ms1st
https://canonical.com/558ms11ms2ms1st
Unattributable221ms31ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-5LTL1CNEJM&cx=c&gtm=4e64k1153ms126ms19ms3rd
https://assets.ubuntu.com/v1/703e23c9-lazysizes+noscript+native-loading.5.1.2.min.js109ms66ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-1NSNT4HZ3S&cx=c&gtm=4e64k1101ms74ms16ms3rd
https://www.googletagmanager.com/gtag/destination?id=AW-608589488&cx=c&gtm=4e64k178ms64ms13ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-M5BPGQ673ms57ms15ms3rd
D
JS Bundles
Action
17 scripts, 331 KB unused
FIX
17 scripts, 331 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-M5B...: 70 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-1NSN...: 68 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/destination?...: 67 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-5LTL...: 64 KB unused (37%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://canonical.com/static/js/dist/homepage_anim...: 63 KB unused (94%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 331 KB
331 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-M5BPGQ6158 KB70 KB (44%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-1NSNT4HZ3S&cx=c&gtm=4e64k1162 KB68 KB (42%)✓3rd
https://www.googletagmanager.com/gtag/destination?id=AW-608589488&cx=c&gtm=4e64k1145 KB67 KB (46%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-5LTL1CNEJM&cx=c&gtm=4e64k1175 KB64 KB (37%)✓3rd
https://canonical.com/static/js/dist/homepage_animations.js?v=cbbe77470 KB63 KB (94%)✓1st
https://canonical.com/static/js/dist/cookie-policy-with-callback.js?v=61270524 KB—✓1st
https://canonical.com/static/js/dist/forms.js?v=eea52ca17 KB—✓1st
https://canonical.com/static/js/modules/cookie-policy/cookie-loader.js?v=87d2e2413 KB—✓1st
https://assets.ubuntu.com/v1/703e23c9-lazysizes+noscript+native-loading.5.1.2.min.js5 KB—✓3rd
https://canonical.com/static/js/dist/watch-consent-changes.js?v=1c3a0923 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

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

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

D
Page Weight Inventory
Action
52 resources · 2.4 MB · 331 KB savings available
FIX
52 resources · 2.4 MB · 331 KB savings available
Warning::
Page weight 1.4 MB over 1MB target
Got: 2.4 MB Expected: ≤ 1 MB
Info::
~331 KB of savings available
Warning::
31 third-party resources (84% of weight)
Info::
1 resources over 200KB
52 resources · 2.4 MiB · 31 third-party 1.4 MiB over 1MB target
JavaScript 34% · 846.0 KiB
Other 29% · 732.5 KiB
Font 23% · 582.3 KiB
Image 8% · 199.9 KiB
CSS 4% · 106.0 KiB
Document 2% · 40.6 KiB

~330.9 KiB of savings available

Remove unused JavaScript: 330.9 KiB
C
Image Optimization
Action
14 images, 0 KB saveable
REVIEW
14 images, 0 KB saveable
Warning::
https://assets.ubuntu.com/v1/2370a9a8-cloud.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://assets.ubuntu.com/v1/9efb4b31-silicon.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://assets.ubuntu.com/v1/d036df5d-hardware.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://assets.ubuntu.com/v1/398d9c17-pause.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
14 images 192 KB
0 oversized -0 KB
7 legacy format
4 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

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
6 fonts (582 KB)
PASS
6 fonts (582 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

582 KB total

Render-blocking

0

of 6

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 2.5 s FCP 1.6 s LCP 1.9 shttps://assets.ubuntu.com/v1/e8c07df6-Ubuntu-L_W.woff2e8c07df6-Ubuntu-L_W.woff2 https://assets.ubuntu.com/v1/e8c07df6-Ubuntu-L_W.woff2 — 124.8 KiB — 1.3 s — font-display: swaphttps://assets.ubuntu.com/v1/7f100985-Ubuntu-Th_W.woff27f100985-Ubuntu-Th_W.woff2 https://assets.ubuntu.com/v1/7f100985-Ubuntu-Th_W.woff2 — 56.8 KiB — 1.5 s — font-display: swaphttps://assets.ubuntu.com/v1/f8097dea-Ubuntu-LI_W.woff2f8097dea-Ubuntu-LI_W.woff2 https://assets.ubuntu.com/v1/f8097dea-Ubuntu-LI_W.woff2 — 123.4 KiB — 1.5 s — font-display: swaphttps://assets.ubuntu.com/v1/fff37993-Ubuntu-R_W.woff2fff37993-Ubuntu-R_W.woff2 https://assets.ubuntu.com/v1/fff37993-Ubuntu-R_W.woff2 — 109.1 KiB — 1.6 s — font-display: swaphttps://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 — 573 ms — font-display: swaphttps://assets.ubuntu.com/v1/90b59210-Ubuntu-Italic%5Bwdth,wght%5D-latin-v0.896a.woff290b59210-Ubuntu-Italic%... https://assets.ubuntu.com/v1/90b59210-Ubuntu-Italic%5Bwdth,wght%5D-latin-v0.896a.woff2 — 74.6 KiB — 566 ms — font-display: swap
e8c07df6-Ubuntu-L_W.woff2 woff2 swap
Size 125 KB
Load time 1.3 s
Start 733 ms
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
7f100985-Ubuntu-Th_W.woff2 woff2 swap
Size 57 KB
Load time 1.5 s
Start 734 ms
Risk FOUT — text flashes from fallback to web font
f8097dea-Ubuntu-LI_W.woff2 woff2 swap
Size 123 KB
Load time 1.5 s
Start 734 ms
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
fff37993-Ubuntu-R_W.woff2 woff2 swap
Size 109 KB
Load time 1.6 s
Start 734 ms
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
f1ea362b-Ubuntu%5Bwdth,... woff2 swap
Size 93 KB
Load time 573 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
90b59210-Ubuntu-Italic%... woff2 swap
Size 75 KB
Load time 566 ms
Start 1.9 s
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)

Fixing the unchecked items could save ~179 KB and ~358 ms

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
HTTP Caching
max-age=60 (1 minute)
PASS
max-age=60 (1 minute)
Info::
Cache-Control header is set
Got: max-age=60, stale-while-revalidate=86400, stale-if-error=300
Info::
Effective TTL: 1 minute (max-age=60)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=60, stale-while-revalidate=86400, stale-if-error=300

DirectiveValueMeaning
max-age60Cache for 1 minute
stale-while-revalidate86400Serve stale for 1 day while fetching fresh
stale-if-error300
Effective TTL: 60 seconds
Network Waterfall
52 requests over 4716ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 1.6 s LCP 1.9 shttps://canonical.com// https://canonical.com/ — 200 — 40.6 KiB — 823 ms — h2https://canonical.com/static/json/suru_light.json/static/json/suru_light.json https://canonical.com/static/json/suru_light.json — 200 — 3.2 KiB — 545 ms — h2https://canonical.com/static/json/suru_shadow.json/static/json/suru_shadow.json https://canonical.com/static/json/suru_shadow.json — 200 — 4.2 KiB — 552 ms — h2https://canonical.com/static/json/centre_hover.json/static/json/centre_hover.json https://canonical.com/static/json/centre_hover.json — 200 — 24.4 KiB — 596 ms — h2https://assets.ubuntu.com/v1/e8c07df6-Ubuntu-L_W.woff2assets.ubuntu.com/v1/e8c07df6-Ubunt... https://assets.ubuntu.com/v1/e8c07df6-Ubuntu-L_W.woff2 — 200 — 124.8 KiB — 1.3 s — h2https://assets.ubuntu.com/v1/7f100985-Ubuntu-Th_W.woff2assets.ubuntu.com/v1/7f100985-Ubunt... https://assets.ubuntu.com/v1/7f100985-Ubuntu-Th_W.woff2 — 200 — 56.8 KiB — 1.5 s — h2https://assets.ubuntu.com/v1/f8097dea-Ubuntu-LI_W.woff2assets.ubuntu.com/v1/f8097dea-Ubunt... https://assets.ubuntu.com/v1/f8097dea-Ubuntu-LI_W.woff2 — 200 — 123.4 KiB — 1.5 s — h2https://assets.ubuntu.com/v1/fff37993-Ubuntu-R_W.woff2assets.ubuntu.com/v1/fff37993-Ubunt... https://assets.ubuntu.com/v1/fff37993-Ubuntu-R_W.woff2 — 200 — 109.1 KiB — 1.6 s — h2https://canonical.com/static/css/styles.css?v=990f606/static/css/styles.css?v=990f606 https://canonical.com/static/css/styles.css?v=990f606 — 200 — 106.0 KiB — 459 ms — h2https://assets.ubuntu.com/v1/82818827-CoF_white.svgassets.ubuntu.com/v1/82818827-CoF_w... https://assets.ubuntu.com/v1/82818827-CoF_white.svg — 200 — 967 B — 836 ms — h2https://assets.ubuntu.com/v1/703e23c9-lazysizes+noscript+native-loading.5.1.2.min.jsassets.ubuntu.com/v1/703e23c9-lazys... https://assets.ubuntu.com/v1/703e23c9-lazysizes+noscript+native-loading.5.1.2.min.js — 200 — 4.7 KiB — 855 ms — h2https://canonical.com/static/files/site.webmanifest?v=861e2f6/static/files/site.webmanifest?v=86... https://canonical.com/static/files/site.webmanifest?v=861e2f6 — 200 — 3.2 KiB — 665 ms — h2https://res.cloudinary.com/canonical/image/fetch/f_auto,q_auto,fl_sanitize,w_900/https%3A%2F%2Fassets.ubuntu.com%2Fv1%2F4fd20cbc-research.pngres.cloudinary.com/canonical/image/... https://res.cloudinary.com/canonical/image/fetch/f_auto,q_auto,fl_sanitize,w_900/https%3A%2F%2Fassets.ubuntu.com%2Fv1%2F4fd20cbc-research.png — 200 — 93.9 KiB — 42 ms — h2https://canonical.com/static/js/modals.js?v=06e4881/static/js/modals.js?v=06e4881 https://canonical.com/static/js/modals.js?v=06e4881 — 200 — 5.7 KiB — 480 ms — h2https://canonical.com/static/js/tabbed-content.js?v=a7ec8b2/static/js/tabbed-content.js?v=a7ec... https://canonical.com/static/js/tabbed-content.js?v=a7ec8b2 — 200 — 5.8 KiB — 482 ms — h2https://canonical.com/static/js/dist/homepage_carousel.js?v=119acc7/static/js/dist/homepage_carousel.j... https://canonical.com/static/js/dist/homepage_carousel.js?v=119acc7 — 200 — 3.6 KiB — 373 ms — h2https://canonical.com/static/js/modules/latest-news/latest-news.js?v=f4905df/static/js/modules/latest-news/late... https://canonical.com/static/js/modules/latest-news/latest-news.js?v=f4905df — 200 — 4.8 KiB — 390 ms — h2https://canonical.com/static/js/dist/navigation.js?v=ae2db6d/static/js/dist/navigation.js?v=ae2... https://canonical.com/static/js/dist/navigation.js?v=ae2db6d — 200 — 7.2 KiB — 465 ms — h2https://canonical.com/static/js/dist/forms.js?v=eea52ca/static/js/dist/forms.js?v=eea52ca https://canonical.com/static/js/dist/forms.js?v=eea52ca — 200 — 16.8 KiB — 412 ms — h2https://canonical.com/static/js/modules/cookie-policy/cookie-loader.js?v=87d2e24/static/js/modules/cookie-policy/co... https://canonical.com/static/js/modules/cookie-policy/cookie-loader.js?v=87d2e24 — 200 — 12.8 KiB — 432 ms — h2https://canonical.com/static/js/dist/cookie-policy-with-callback.js?v=6127052/static/js/dist/cookie-policy-with-... https://canonical.com/static/js/dist/cookie-policy-with-callback.js?v=6127052 — 200 — 3.8 KiB — 438 ms — h2https://canonical.com/static/js/dist/watch-consent-changes.js?v=1c3a092/static/js/dist/watch-consent-chang... https://canonical.com/static/js/dist/watch-consent-changes.js?v=1c3a092 — 200 — 3.2 KiB — 443 ms — h2https://pubads.g.doubleclick.net/activity;xsp=4822915;ord=8218177192734599?pubads.g.doubleclick.net/activity;x... https://pubads.g.doubleclick.net/activity;xsp=4822915;ord=8218177192734599? — 200 — 64 B — 119 ms — h3https://canonical.com/blog/latest-news?limit=3&group-id=2100/blog/latest-news?limit=3&group-id=... https://canonical.com/blog/latest-news?limit=3&group-id=2100 — 200 — 6.7 KiB — 183 ms — h2https://canonical.com/user-country-tz.json?tz=UTC/user-country-tz.json?tz=UTC https://canonical.com/user-country-tz.json?tz=UTC — 200 — 2.7 KiB — 182 ms — h2https://assets.ubuntu.com/v1/398d9c17-pause.svgassets.ubuntu.com/v1/398d9c17-pause... https://assets.ubuntu.com/v1/398d9c17-pause.svg — 200 — 797 B — 284 ms — h2https://assets.ubuntu.com/v1/2370a9a8-cloud.svgassets.ubuntu.com/v1/2370a9a8-cloud... https://assets.ubuntu.com/v1/2370a9a8-cloud.svg — 200 — 1.4 KiB — 283 ms — h2https://assets.ubuntu.com/v1/9efb4b31-silicon.svgassets.ubuntu.com/v1/9efb4b31-silic... https://assets.ubuntu.com/v1/9efb4b31-silicon.svg — 200 — 1.0 KiB — 279 ms — h2https://assets.ubuntu.com/v1/d036df5d-hardware.svgassets.ubuntu.com/v1/d036df5d-hardw... https://assets.ubuntu.com/v1/d036df5d-hardware.svg — 200 — 904 B — 281 ms — h2data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16'%3E%3Cpath fill=…www.w3.org/2000/svg' width='16' hei... data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16'%3E%3Cpath fill=… — 200 — 0 B — 0 ms — data
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 1.6 s LCP 1.9 shttps://canonical.com// https://canonical.com/ — 200 — 40.6 KiB — 823 ms — h2https://canonical.com/static/json/suru_light.json/static/json/suru_light.json https://canonical.com/static/json/suru_light.json — 200 — 3.2 KiB — 545 ms — h2https://canonical.com/static/json/suru_shadow.json/static/json/suru_shadow.json https://canonical.com/static/json/suru_shadow.json — 200 — 4.2 KiB — 552 ms — h2https://canonical.com/static/json/centre_hover.json/static/json/centre_hover.json https://canonical.com/static/json/centre_hover.json — 200 — 24.4 KiB — 596 ms — h2https://assets.ubuntu.com/v1/e8c07df6-Ubuntu-L_W.woff2assets.ubuntu.com/v1/e8c07df6-Ubunt... https://assets.ubuntu.com/v1/e8c07df6-Ubuntu-L_W.woff2 — 200 — 124.8 KiB — 1.3 s — h2https://assets.ubuntu.com/v1/7f100985-Ubuntu-Th_W.woff2assets.ubuntu.com/v1/7f100985-Ubunt... https://assets.ubuntu.com/v1/7f100985-Ubuntu-Th_W.woff2 — 200 — 56.8 KiB — 1.5 s — h2https://assets.ubuntu.com/v1/f8097dea-Ubuntu-LI_W.woff2assets.ubuntu.com/v1/f8097dea-Ubunt... https://assets.ubuntu.com/v1/f8097dea-Ubuntu-LI_W.woff2 — 200 — 123.4 KiB — 1.5 s — h2https://assets.ubuntu.com/v1/fff37993-Ubuntu-R_W.woff2assets.ubuntu.com/v1/fff37993-Ubunt... https://assets.ubuntu.com/v1/fff37993-Ubuntu-R_W.woff2 — 200 — 109.1 KiB — 1.6 s — h2https://canonical.com/static/css/styles.css?v=990f606/static/css/styles.css?v=990f606 https://canonical.com/static/css/styles.css?v=990f606 — 200 — 106.0 KiB — 459 ms — h2https://assets.ubuntu.com/v1/82818827-CoF_white.svgassets.ubuntu.com/v1/82818827-CoF_w... https://assets.ubuntu.com/v1/82818827-CoF_white.svg — 200 — 967 B — 836 ms — h2https://assets.ubuntu.com/v1/703e23c9-lazysizes+noscript+native-loading.5.1.2.min.jsassets.ubuntu.com/v1/703e23c9-lazys... https://assets.ubuntu.com/v1/703e23c9-lazysizes+noscript+native-loading.5.1.2.min.js — 200 — 4.7 KiB — 855 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
29% of JavaScript execution is third-party
First-party Third-party 735ms · 644KB · $10/mo
Unattributable
Other
Costly
Execution 221ms
Transfer 0 KB
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Optional
Execution 153ms
Transfer 175 KB
Unused 37%
Monthly Cost $2/mo
assets.ubuntu.com
Other
Optional
Execution 109ms
Transfer 5 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 101ms
Transfer 162 KB
Unused 42%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 78ms
Transfer 145 KB
Unused 46%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 73ms
Transfer 158 KB
Unused 44%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 221ms and costs ~$3/month

Unattributable takes 221ms 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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