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https://icloud.com

Performance

· 26 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
5
REVIEW
6
PASS
12
INFO
3

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

Mobile Desktop
50
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
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.

2.11 s

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

16.76 s

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

1.15 s

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.

2.30 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.

16.80 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
26
12 PASS 6 REVIEW 5 FIX
F
Page Weight Budget
Action
3.6 MB transferred, 31 requests
FIX
3.6 MB transferred, 31 requests
Warning::
Page weighs 8.0 MB (3.6 MB transferred)
Warning::
JavaScript is 907 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 907 KB
Info::
Fonts are 689 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 689 KB
Info::
31 HTTP requests
Info::
Estimated 0.76 g CO2 per page load
3.6 MB / 2.4 MB budget
3.6 MB transferred
31 requests
0.76 g CO2 per page load
Other 1.1 MiB 31%
JavaScript 906.9 KiB 24%
Fonts 689.4 KiB 19%
Other 477.7 KiB 13%
Images 379.0 KiB 10%
CSS 75.9 KiB 2%
HTML 11.1 KiB 0%
Other 3.0 KiB 0%
Other 1.1 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
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (3.6 MiB of 3.6 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2115ms total JS execution
FIX
2115ms total JS execution
Warning::
https://www.icloud.com/system/icloud.com/2618Build...: 1278ms CPU time
Warning::
https://www.icloud.com/: 336ms CPU time
Warning::
Unattributable: 295ms CPU time
Info::
https://www.icloud.com/system/icloud.com/2618Build...: 106ms CPU time
Info::
https://www.icloud.com/system/icloud.com/2618Build...: 100ms CPU time
Warning::
Third-party scripts: 1820ms (86% of total)

Main Thread Breakdown

Script Evaluation 47% Script Parsing & Compilation 20% Other 20% Style & Layout 6% Parse HTML & CSS 5%
ScriptTotalScriptingParse/CompileParty
https://www.icloud.com/system/icloud.com/2618Build21/en-us/main.js1278ms890ms345ms3rd
https://www.icloud.com/336ms68ms7ms3rd
Unattributable295ms23ms0ms1st
https://www.icloud.com/system/icloud.com/2618Build21/en-us/RootComponentRoute.js106ms27ms62ms3rd
https://www.icloud.com/system/icloud.com/2618Build21/en-us/main.css100ms0ms0ms3rd
F
JS Bundles
Action
7 scripts, 582 KB unused
FIX
7 scripts, 582 KB unused
Warning::
https://www.icloud.com/system/icloud.com/2618Build...: 515 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.icloud.com/system/icloud.com/2618Build...: 66 KB unused (74%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.icloud.com/system/icloud.com/2618Build...: unminified — 29 KB could be saved
Warning::
https://www.icloud.com/system/icloud.com/2618Build...: unminified — 8 KB could be saved
Info::
Total unused JavaScript: 582 KB
582 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.icloud.com/system/icloud.com/2618Build21/en-us/main.js769 KB515 KB (67%)✓3rd
https://www.icloud.com/system/icloud.com/2618Build21/en-us/RootComponentRoute.js91 KB66 KB (74%)✗3rd
blob:https://www.icloud.com/0b2867fb-89c3-4fd5-ae6c-85ceb7d9a8330 KB—✓3rd
https://www.icloud.com/system/icloud.com/2618Build21/en-us/vendors~RootComponentRoute.js33 KB—✗3rd
https://appleid.cdn-apple.com/appleauth/static/jsapi/authService.latest.min.js15 KB—✓3rd
https://www.icloud.com/system/icloud.com/2618Build21/en-us/vendors~Routes-HomePageRoute.js347 KB—✓3rd
https://www.icloud.com/system/icloud.com/2618Build21/en-us/Routes-HomePageRoute.js128 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

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

F
Page Weight Inventory
Action
31 resources · 3.6 MB · 582 KB savings available
FIX
31 resources · 3.6 MB · 582 KB savings available
Warning::
Page weight 3.6 MB exceeds 1 MB target by 2.6 MB
Got: 3.6 MB Expected: ≤ 1 MB
Info::
~582 KB of savings available
Warning::
30 third-party resources (100% of weight)
Info::
6 resources over 200KB
31 resources · 3.6 MiB · 30 third-party 2.6 MiB over 1MB target
JavaScript 37% · 1.3 MiB
Media 31% · 1.1 MiB
Font 19% · 689.4 KiB
Image 10% · 381.3 KiB
CSS 2% · 75.9 KiB
Document 0% · 11.1 KiB
Other 0% · 4.5 KiB

~581.9 KiB of savings available

Remove unused JavaScript: 581.9 KiB
B
Image Optimization
7 images, 0 KB saveable
REVIEW
7 images, 0 KB saveable
Info::
All images are well-optimized
7 images 379 KB
0 oversized -0 KB
5 legacy format
0 missing dimensions CLS risk
B
HTTP/3 (QUIC)
HTTP/3 not advertised
REVIEW
HTTP/3 not advertised
Info::
HTTP/3 (QUIC) is not advertised
HTTP/3 isn't advertised via Alt-Svc and the worker didn't negotiate h3. HTTP/3 reduces handshake latency (1-RTT instead of 2-3 RTTs) and is more resilient on lossy connections. Most modern CDNs (Cloudflare, Fastly, AWS CloudFront, Google Cloud CDN) support HTTP/3 with a single config switch -- consider enabling for mobile-heavy workloads.
C
Compression Algorithm
Action
Main response served uncompressed
REVIEW
Main response served uncompressed
Info::
Main HTML response has no Content-Encoding (uncompressed)
The main HTML document is served without compression. The Text Compression section above lists the broader picture; for the main response specifically, even gzip would shave ~70-80% off most text payloads.
B
Main HTML Cache-Control
Main HTML max-age=3600 (~60min)
REVIEW
Main HTML max-age=3600 (~60min)
Info::
Main HTML cached for 60 minutes -- mild staleness risk
Got: max-age=3600
B
Server-Timing Observability
No Server-Timing header found
REVIEW
No Server-Timing header found
Info::
No Server-Timing header found
Server-Timing exposes backend timing breakdowns to browser DevTools (e.g., `db: 45ms; render: 120ms; cache: 2ms`). Useful for diagnosing slow pages without backend log access. Most modern frameworks (Next.js, Cloudflare Workers, Fastly) emit it automatically; absence on a managed platform usually means telemetry headers are stripped at the edge.
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
4 fonts (689 KB)
PASS
4 fonts (689 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

689 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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s FCP 2.1 s LCP 16.8 shttps://www.apple.com/wss/fonts/SF-Pro-Display/v3/sf-pro-display_regular.woff2sf-pro-display_regular.... https://www.apple.com/wss/fonts/SF-Pro-Display/v3/sf-pro-display_regular.woff2 — 115.4 KiB — 43 ms — font-display: swaphttps://www.apple.com/wss/fonts/SF-Pro-Text/v3/sf-pro-text_regular.woff2sf-pro-text_regular.woff2 https://www.apple.com/wss/fonts/SF-Pro-Text/v3/sf-pro-text_regular.woff2 — 216.5 KiB — 50 ms — font-display: swaphttps://www.apple.com/wss/fonts/SF-Pro-Display/v3/sf-pro-display_semibold.woff2sf-pro-display_semibold... https://www.apple.com/wss/fonts/SF-Pro-Display/v3/sf-pro-display_semibold.woff2 — 127.6 KiB — 50 ms — font-display: swaphttps://www.apple.com/wss/fonts/SF-Pro-Text/v3/sf-pro-text_semibold.woff2sf-pro-text_semibold.woff2 https://www.apple.com/wss/fonts/SF-Pro-Text/v3/sf-pro-text_semibold.woff2 — 229.9 KiB — 51 ms — font-display: swap
sf-pro-display_regular.... woff2 swap
Size 115 KB
Load time 43 ms
Start 61 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
sf-pro-text_regular.woff2 woff2 swap
Size 217 KB
Load time 50 ms
Start 61 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
sf-pro-display_semibold... woff2 swap
Size 128 KB
Load time 50 ms
Start 61 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
sf-pro-text_semibold.woff2 woff2 swap
Size 230 KB
Load time 51 ms
Start 61 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
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 ~345 KB and ~690 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
13 hints, 0 missing preconnects
PASS
13 hints, 0 missing preconnects
Info::
3 dns-prefetch redundant with preconnect on same origin
preconnect already does the DNS lookup; adding dns-prefetch to the same origin is at best a no-op. Sample: https://gateway.icloud.com, https://ckdatabasews.icloud.com, https://cvws.icloud-content.com. Remove the redundant dns-prefetch entries.
Info::
3 URL(s) appear in multiple hints
The same href shouldn't appear in multiple hint rels -- one wins, the others are wasted markup and may confuse cache behavior. Sample: https://gateway.icloud.com (preconnect+dns-prefetch), https://ckdatabasews.icloud.com (preconnect+dns-prefetch), https://cvws.icloud-content.com (preconnect+dns-prefetch).
Info::
Page uses 13 resource hint(s)

Current Resource Hints

preconnect
3
preload
7
dns-prefetch
3
prefetch
—

13 resource hints configured

preconnect already does the DNS lookup; adding dns-prefetch to the same origin is at best a no-op. Sample: https://gateway.icloud.com, https://ckdatabasews.icloud.com, https://cvws.icloud-content.com. Remove the redundant dns-prefetch entries.

Why this matters

Performance issues directly impact user engagement and conversion rates.

The same href shouldn't appear in multiple hint rels -- one wins, the others are wasted markup and may confuse cache behavior. Sample: https://gateway.icloud.com (preconnect+dns-prefetch), https://ckdatabasews.icloud.com (preconnect+dns-prefetch), https://cvws.icloud-content.com (preconnect+dns-prefetch).

Why this matters

Performance issues directly impact user engagement and conversion rates.

A+
LCP Image Preload
LCP preload audit not available
PASS
LCP preload audit not available
Info::
LCP image preload audit not available for this scan
A+
Server Response Intelligence
1 server-response signal(s) detected
PASS
1 server-response signal(s) detected
Info::
No `ETag` or `Last-Modified` -- conditional GET not supported
Without either header, browsers can't issue conditional GETs and refresh always re-downloads the full response body even when nothing changed. Add `ETag: "<hash>"` (or `Last-Modified: <date>`) on cacheable responses; the server returns 304 Not Modified when the client's cached copy is still valid, saving bandwidth.
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
JavaScript Blocking
1 JS blocking issue(s) detected
PASS
1 JS blocking issue(s) detected
Warning::
3 render-blocking <script src> tag(s) without async/defer
Each `<script src=...>` without `async`, `defer`, or `type="module"` blocks HTML parsing while the browser fetches and executes it. The block lasts the entire round-trip + execution time -- on slow networks this translates directly into LCP delay. Add `defer` (executes after parse, in source order) for scripts that interact with the DOM, or `async` (executes whenever ready) for analytics / independent scripts. Module scripts (`type="module"`) are deferred by default.
A
CSS Performance Depth
1 CSS depth issue(s) detected
PASS
1 CSS depth issue(s) detected
Warning::
5 render-blocking stylesheet(s) -- recommended: <=3
Each `<link rel="stylesheet">` without a non-blocking `media` attribute holds up the first paint. Browsers download all of them before painting any content. Consolidate into 1-2 critical-path stylesheets; defer non-critical CSS via `<link rel="stylesheet" media="print" onload="this.media='all'">` or via the loadCSS pattern; inline above-the-fold CSS in `<style>` to short-circuit the request entirely.
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::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=3600

DirectiveValueMeaning
max-age3600Cache for 1 hour
Effective TTL: 3600 seconds
Network Waterfall
31 requests over 639ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s FCP 2.1 s LCP 16.8 shttps://icloud.com// https://icloud.com/ — 301 — 373 B — 9 ms — h2https://www.icloud.com/www.icloud.com/ https://www.icloud.com/ — 200 — 11.1 KiB — 25 ms — http/1.1https://www.icloud.com/system/icloud.com/2618Build21/en-us/main.jswww.icloud.com/system/icloud.com/26... https://www.icloud.com/system/icloud.com/2618Build21/en-us/main.js — 200 — 768.9 KiB — 69 ms — http/1.1https://www.apple.com/wss/fonts/?families=SF+Pro,v3www.apple.com/wss/fonts/?families=S... https://www.apple.com/wss/fonts/?families=SF+Pro,v3 — 200 — 2.1 KiB — 26 ms — http/1.1https://www.apple.com/wss/fonts/SF-Pro-Display/v3/sf-pro-display_regular.woff2www.apple.com/wss/fonts/SF-Pro-Disp... https://www.apple.com/wss/fonts/SF-Pro-Display/v3/sf-pro-display_regular.woff2 — 200 — 115.4 KiB — 43 ms — http/1.1https://www.apple.com/wss/fonts/SF-Pro-Text/v3/sf-pro-text_regular.woff2www.apple.com/wss/fonts/SF-Pro-Text... https://www.apple.com/wss/fonts/SF-Pro-Text/v3/sf-pro-text_regular.woff2 — 200 — 216.5 KiB — 50 ms — http/1.1https://www.apple.com/wss/fonts/SF-Pro-Display/v3/sf-pro-display_semibold.woff2www.apple.com/wss/fonts/SF-Pro-Disp... https://www.apple.com/wss/fonts/SF-Pro-Display/v3/sf-pro-display_semibold.woff2 — 200 — 127.6 KiB — 50 ms — http/1.1https://www.apple.com/wss/fonts/SF-Pro-Text/v3/sf-pro-text_semibold.woff2www.apple.com/wss/fonts/SF-Pro-Text... https://www.apple.com/wss/fonts/SF-Pro-Text/v3/sf-pro-text_semibold.woff2 — 200 — 229.9 KiB — 51 ms — http/1.1https://setup.icloud.com/setup/ws/1/validate?clientBuildNumber=2618Build21&clientMasteringNumber=2618Build21&clientId=ab477261-9acc-49b1-8a23-027fcd584f34&requestId=b9a45f33-b7fb-4b36-9733-50b9e4e28918setup.icloud.com/setup/ws/1/validat... https://setup.icloud.com/setup/ws/1/validate?clientBuildNumber=2618Build21&clientMasteringNumber=2618Build21&clientId=ab477261-9acc-49b1-8a23-027fcd584f34&requestId=b9a45f33-b7fb-4b36-9733-50b9e4e28918 — 421 — 1.4 KiB — 466 ms — http/1.1https://www.icloud.com/system/icloud.com/2618Build21/en-us/main.csswww.icloud.com/system/icloud.com/26... https://www.icloud.com/system/icloud.com/2618Build21/en-us/main.css — 200 — 47.6 KiB — 26 ms — http/1.1https://www.icloud.com/system/icloud.com/2618Build21/en-us/images@2x.binwww.icloud.com/system/icloud.com/26... https://www.icloud.com/system/icloud.com/2618Build21/en-us/images@2x.bin — 200 — 1.1 KiB — 3 ms — http/1.1blob:https://www.icloud.com/0b2867fb-89c3-4fd5-ae6c-85ceb7d9a833www.icloud.com/0b2867fb-89c3-4fd5-a... blob:https://www.icloud.com/0b2867fb-89c3-4fd5-ae6c-85ceb7d9a833 — -1 — 0 B — 0 ms — https://www.icloud.com/locales/5/en-US.json?clientBuildNumber=2618Build21&clientMasteringNumber=2618Build21&clientId=ab477261-9acc-49b1-8a23-027fcd584f34www.icloud.com/locales/5/en-US.json... https://www.icloud.com/locales/5/en-US.json?clientBuildNumber=2618Build21&clientMasteringNumber=2618Build21&clientId=ab477261-9acc-49b1-8a23-027fcd584f34 — 200 — 1.7 KiB — 16 ms — http/1.1data:image/webp;base64,UklGRiIAAABXRUJQVlA4IBYAAAAwAQCdASoBAAEADsD+JaQAA3AAAAAAdata:image/webp;base64,UklGRiIAAABX... data:image/webp;base64,UklGRiIAAABXRUJQVlA4IBYAAAAwAQCdASoBAAEADsD+JaQAA3AAAAAA — 200 — 0 B — 0 ms — datablob:https://www.icloud.com/7edd1d3f-c4b5-4c73-a5db-f46745870b77www.icloud.com/7edd1d3f-c4b5-4c73-a... blob:https://www.icloud.com/7edd1d3f-c4b5-4c73-a5db-f46745870b77 — 200 — 0 B — 1 ms — blobdata:text/css;base64,LmJyb3dzZXItbm90aWZpY2F0aW9ucy1zdWNjZXNzLWFsZXJ0IC50aXRsZTo6YmVmb3Jle2JhY2tncm…data:text/css;base64,LmJyb3dzZXItbm... data:text/css;base64,LmJyb3dzZXItbm90aWZpY2F0aW9ucy1zdWNjZXNzLWFsZXJ0IC50aXRsZTo6YmVmb3Jle2JhY2tncm… — 200 — 0 B — 0 ms — datahttps://www.icloud.com/system/icloud.com/2618Build21/en-us/6.main.csswww.icloud.com/system/icloud.com/26... https://www.icloud.com/system/icloud.com/2618Build21/en-us/6.main.css — 200 — 1.4 KiB — 9 ms — http/1.1https://www.icloud.com/system/icloud.com/2618Build21/en-us/vendors~RootComponentRoute.jswww.icloud.com/system/icloud.com/26... https://www.icloud.com/system/icloud.com/2618Build21/en-us/vendors~RootComponentRoute.js — 200 — 33.0 KiB — 11 ms — http/1.1https://www.icloud.com/system/icloud.com/2618Build21/en-us/1.main.csswww.icloud.com/system/icloud.com/26... https://www.icloud.com/system/icloud.com/2618Build21/en-us/1.main.css — 200 — 24.7 KiB — 31 ms — http/1.1https://www.icloud.com/system/icloud.com/2618Build21/en-us/RootComponentRoute.jswww.icloud.com/system/icloud.com/26... https://www.icloud.com/system/icloud.com/2618Build21/en-us/RootComponentRoute.js — 200 — 90.5 KiB — 33 ms — http/1.1https://www.icloud.com/system/icloud.com/2618Build21/wallpaper.svgwww.icloud.com/system/icloud.com/26... https://www.icloud.com/system/icloud.com/2618Build21/wallpaper.svg — 200 — 2.1 KiB — 29 ms — http/1.1https://www.icloud.com/system/icloud.com/2618Build21/wallpaper_dark.svgwww.icloud.com/system/icloud.com/26... https://www.icloud.com/system/icloud.com/2618Build21/wallpaper_dark.svg — 200 — 2.2 KiB — 26 ms — http/1.1https://www.icloud.com/system/icloud.com/2618Build21/favicons/default-favicon-light-32x32.pngwww.icloud.com/system/icloud.com/26... https://www.icloud.com/system/icloud.com/2618Build21/favicons/default-favicon-light-32x32.png — 200 — 2.4 KiB — 25 ms — http/1.1https://appleid.cdn-apple.com/appleauth/static/jsapi/authService.latest.min.jsappleid.cdn-apple.com/appleauth/sta... https://appleid.cdn-apple.com/appleauth/static/jsapi/authService.latest.min.js — 200 — 14.5 KiB — 62 ms — http/1.1https://www.icloud.com/system/icloud.com/2618Build21/564be320e7a67acee204043935e41647.pngwww.icloud.com/system/icloud.com/26... https://www.icloud.com/system/icloud.com/2618Build21/564be320e7a67acee204043935e41647.png — 200 — 103.9 KiB — 18 ms — http/1.1https://www.icloud.com/system/icloud.com/2618Build21/06b68855764eb0e23f269ed4ef7935f0.pngwww.icloud.com/system/icloud.com/26... https://www.icloud.com/system/icloud.com/2618Build21/06b68855764eb0e23f269ed4ef7935f0.png — 200 — 67.1 KiB — 13 ms — http/1.1https://www.icloud.com/system/icloud.com/2618Build21/7cb9ecdad2b384754de394732519f658.pngwww.icloud.com/system/icloud.com/26... https://www.icloud.com/system/icloud.com/2618Build21/7cb9ecdad2b384754de394732519f658.png — 200 — 203.7 KiB — 22 ms — http/1.1https://www.icloud.com/system/icloud.com/2618Build21/fpo@1x.mp4www.icloud.com/system/icloud.com/26... https://www.icloud.com/system/icloud.com/2618Build21/fpo@1x.mp4 — 206 — 1.1 MiB — 48 ms — http/1.1https://www.icloud.com/system/icloud.com/2618Build21/en-us/vendors~Routes-HomePageRoute.jswww.icloud.com/system/icloud.com/26... https://www.icloud.com/system/icloud.com/2618Build21/en-us/vendors~Routes-HomePageRoute.js — 200 — 346.8 KiB — 34 ms — http/1.1https://www.icloud.com/system/icloud.com/2618Build21/en-us/Routes-HomePageRoute.jswww.icloud.com/system/icloud.com/26... https://www.icloud.com/system/icloud.com/2618Build21/en-us/Routes-HomePageRoute.js — 200 — 128.2 KiB — 23 ms — http/1.1
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s FCP 2.1 s LCP 16.8 shttps://icloud.com// https://icloud.com/ — 301 — 373 B — 9 ms — h2https://www.icloud.com/www.icloud.com/ https://www.icloud.com/ — 200 — 11.1 KiB — 25 ms — http/1.1https://www.icloud.com/system/icloud.com/2618Build21/en-us/main.jswww.icloud.com/system/icloud.com/26... https://www.icloud.com/system/icloud.com/2618Build21/en-us/main.js — 200 — 768.9 KiB — 69 ms — http/1.1https://www.apple.com/wss/fonts/?families=SF+Pro,v3www.apple.com/wss/fonts/?families=S... https://www.apple.com/wss/fonts/?families=SF+Pro,v3 — 200 — 2.1 KiB — 26 ms — http/1.1https://www.apple.com/wss/fonts/SF-Pro-Display/v3/sf-pro-display_regular.woff2www.apple.com/wss/fonts/SF-Pro-Disp... https://www.apple.com/wss/fonts/SF-Pro-Display/v3/sf-pro-display_regular.woff2 — 200 — 115.4 KiB — 43 ms — http/1.1https://www.apple.com/wss/fonts/SF-Pro-Text/v3/sf-pro-text_regular.woff2www.apple.com/wss/fonts/SF-Pro-Text... https://www.apple.com/wss/fonts/SF-Pro-Text/v3/sf-pro-text_regular.woff2 — 200 — 216.5 KiB — 50 ms — http/1.1https://www.apple.com/wss/fonts/SF-Pro-Display/v3/sf-pro-display_semibold.woff2www.apple.com/wss/fonts/SF-Pro-Disp... https://www.apple.com/wss/fonts/SF-Pro-Display/v3/sf-pro-display_semibold.woff2 — 200 — 127.6 KiB — 50 ms — http/1.1https://www.apple.com/wss/fonts/SF-Pro-Text/v3/sf-pro-text_semibold.woff2www.apple.com/wss/fonts/SF-Pro-Text... https://www.apple.com/wss/fonts/SF-Pro-Text/v3/sf-pro-text_semibold.woff2 — 200 — 229.9 KiB — 51 ms — http/1.1https://setup.icloud.com/setup/ws/1/validate?clientBuildNumber=2618Build21&clientMasteringNumber=2618Build21&clientId=ab477261-9acc-49b1-8a23-027fcd584f34&requestId=b9a45f33-b7fb-4b36-9733-50b9e4e28918setup.icloud.com/setup/ws/1/validat... 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— 200 — 90.5 KiB — 33 ms — http/1.1https://www.icloud.com/system/icloud.com/2618Build21/wallpaper.svgwww.icloud.com/system/icloud.com/26... https://www.icloud.com/system/icloud.com/2618Build21/wallpaper.svg — 200 — 2.1 KiB — 29 ms — http/1.1https://www.icloud.com/system/icloud.com/2618Build21/wallpaper_dark.svgwww.icloud.com/system/icloud.com/26... https://www.icloud.com/system/icloud.com/2618Build21/wallpaper_dark.svg — 200 — 2.2 KiB — 26 ms — http/1.1https://www.icloud.com/system/icloud.com/2618Build21/favicons/default-favicon-light-32x32.pngwww.icloud.com/system/icloud.com/26... https://www.icloud.com/system/icloud.com/2618Build21/favicons/default-favicon-light-32x32.png — 200 — 2.4 KiB — 25 ms — http/1.1https://appleid.cdn-apple.com/appleauth/static/jsapi/authService.latest.min.jsappleid.cdn-apple.com/appleauth/sta... https://appleid.cdn-apple.com/appleauth/static/jsapi/authService.latest.min.js — 200 — 14.5 KiB — 62 ms — 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http/1.1https://www.icloud.com/system/icloud.com/2618Build21/en-us/vendors~Routes-HomePageRoute.jswww.icloud.com/system/icloud.com/26... https://www.icloud.com/system/icloud.com/2618Build21/en-us/vendors~Routes-HomePageRoute.js — 200 — 346.8 KiB — 34 ms — http/1.1https://www.icloud.com/system/icloud.com/2618Build21/en-us/Routes-HomePageRoute.jswww.icloud.com/system/icloud.com/26... https://www.icloud.com/system/icloud.com/2618Build21/en-us/Routes-HomePageRoute.js — 200 — 128.2 KiB — 23 ms — http/1.1https://www.icloud.com/system/icloud.com/2618Build21/fpo@1x.mp4www.icloud.com/system/icloud.com/26... https://www.icloud.com/system/icloud.com/2618Build21/fpo@1x.mp4 — 206 — 20.4 KiB — 12 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
86% of JavaScript execution is third-party
First-party Third-party 1820ms · 918KB · $24/mo
www.icloud.com
Other
Costly
Execution 1278ms
Transfer 769 KB
Unused 67%
Monthly Cost $17/mo
www.icloud.com
Other
Costly
Execution 336ms
Transfer 11 KB
Monthly Cost $4/mo
www.icloud.com
Other
Optional
Execution 106ms
Transfer 91 KB
Unused 74%
Monthly Cost $1/mo
www.icloud.com
Other
Optional
Execution 100ms
Transfer 48 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.icloud.com adds 1278ms and costs ~$17/month
  • www.icloud.com adds 336ms and costs ~$4/month

86% 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.icloud.com takes 1278ms 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

67% of www.icloud.com'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

www.icloud.com takes 336ms 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

74% of www.icloud.com'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

Image Optimization
4 images, 314 KB total, 183 KB wasted
INFO

Image Optimization Audit

Total Images

4

Total Size

314 KB

Oversized

1

Wasted

183 KB

1 missing alt text 3 missing dimensions 2 missing lazy loading
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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