Skip to content
https://www.apple.com

Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
85
GRADE
B
FIX
1
REVIEW
5
PASS
8
INFO
2

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

Mobile Desktop
57
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
92
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.

8.34 s

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

9.76 s

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

25 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.

8.34 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.

9.78 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
16
8 PASS 5 REVIEW 1 FIX
D
JS Execution Cost
Action
2935ms total JS execution
FIX
2935ms total JS execution
Warning::
https://www.apple.com/: 798ms CPU time
Warning::
https://www.apple.com/v/home/a/scripts/main.built....: 664ms CPU time
Warning::
https://www.apple.com/api-www/global-elements/glob...: 500ms CPU time
Warning::
Unattributable: 309ms CPU time
Info::
https://www.apple.com/metrics/ac-analytics/2.29.1/...: 193ms CPU time
Info::
Third-party scripts: 309ms (11% of total)

Main Thread Breakdown

Script Evaluation 34% Other 27% Style & Layout 24% Rendering 6% Parse HTML & CSS 4% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
https://www.apple.com/798ms9ms2ms1st
https://www.apple.com/v/home/a/scripts/main.built.js664ms179ms1ms1st
https://www.apple.com/api-www/global-elements/global-header/v1/assets/globalheader.umd.js500ms262ms19ms1st
Unattributable309ms13ms0ms3rd
https://www.apple.com/metrics/ac-analytics/2.29.1/scripts/auto-init.js193ms191ms0ms1st
https://www.apple.com/metrics/ac-target/latest/ac-target.js182ms161ms15ms1st
https://www.apple.com/metrics/ac-analytics/2.29.1/scripts/ac-analytics.js127ms67ms58ms1st
https://www.apple.com/ac/localeswitcher/4/en_US/scripts/localeswitcher.built.js82ms56ms23ms1st
https://www.apple.com/v/home/a/scripts/BaseComponent-4eXX3M0u.built.js79ms60ms0ms1st
C
Page Weight Budget
Action
1.8 MB transferred, 44 requests
REVIEW
1.8 MB transferred, 44 requests
Info::
Page weighs 3.3 MB (1.8 MB transferred)
Info::
Fonts are 916 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 916 KB
Info::
44 HTTP requests
Info::
Estimated 0.38 g CO2 per page load
1.8 MB / 2.4 MB budget
1.8 MB transferred
44 requests
0.38 g CO2 per page load
Fonts 916.1 KiB 49%
JavaScript 446.6 KiB 24%
Images 311.4 KiB 17%
CSS 71.5 KiB 4%
Other 42.8 KiB 2%
HTML 40.0 KiB 2%
Other 23.5 KiB 1%
Other 3.1 KiB 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
7 images, 0 KB saveable
REVIEW
7 images, 0 KB saveable
Warning::
https://www.apple.com/v/home/a/images/heroes/iphon... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.apple.com/v/home/a/images/heroes/macbo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.apple.com/v/home/a/images/logos/ipad-a... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.apple.com/v/home/a/images/heroes/ipad-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.apple.com/v/home/a/images/promos/wwdc2... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
data:image/gif;base64,R0lGODlhAQABAHAAACH5BAEAAAAA... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
7 images 311 KB
0 oversized -0 KB
6 legacy format
6 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

C
JS Bundles
Action
15 scripts, 159 KB unused
REVIEW
15 scripts, 159 KB unused
Warning::
https://www.apple.com/api-www/global-elements/glob...: 56 KB unused (35%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.apple.com/metrics/ac-analytics/2.29.1/...: 41 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.apple.com/ac/localeswitcher/4/en_US/sc...: 35 KB unused (63%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.apple.com/v/home/a/built/scripts/endle...: 27 KB unused (68%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 159 KB
159 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.apple.com/api-www/global-elements/global-header/v1/assets/globalheader.umd.js161 KB56 KB (35%)✓1st
https://www.apple.com/metrics/ac-analytics/2.29.1/scripts/ac-analytics.js102 KB41 KB (40%)✓1st
https://www.apple.com/ac/localeswitcher/4/en_US/scripts/localeswitcher.built.js56 KB35 KB (63%)✓1st
https://www.apple.com/v/home/a/built/scripts/endless-entertainment-gallery.built.js41 KB27 KB (68%)✓1st
https://www.apple.com/v/home/a/scripts/head.built.js4 KB—✓1st
https://www.apple.com/metrics/ac-analytics/2.29.1/scripts/auto-init.js1 KB—✓1st
https://www.apple.com/ac/globalfooter/8/en_US/scripts/ac-globalfooter.built.js4 KB—✓1st
https://www.apple.com/metrics/ac-target/latest/ac-target.js38 KB—✓1st
https://www.apple.com/v/home/a/scripts/main.built.js25 KB—✓1st
https://www.apple.com/v/home/a/scripts/home-analytics.built.js2 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

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

Green Hosting

No green hosting detected

B
HTTP Caching
max-age=0
REVIEW
max-age=0
Info::
Cache-Control header is set
Got: max-age=0
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=0

DirectiveValueMeaning
max-age0Cache for 0 seconds
A+
Third-Party Impact
0% third-party, 0 ms blocking
PASS
0% third-party, 0 ms blocking
Info::
Third-party code accounts for 0% of page weight (2.3 KiB of 1.8 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
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
5 fonts (916 KB)
PASS
5 fonts (916 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

916 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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 8.3 s LCP 9.8 shttps://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 — 229.6 KiB — 0 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 — 127.2 KiB — 0 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 — 216.2 KiB — 0 ms — font-display: swaphttps://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 — 115.1 KiB — 0 ms — font-display: swaphttps://www.apple.com/wss/fonts/SF-Pro-Text/v3/sf-pro-text_bold.woff2sf-pro-text_bold.woff2 https://www.apple.com/wss/fonts/SF-Pro-Text/v3/sf-pro-text_bold.woff2 — 228.0 KiB — 0 ms — font-display: swap
sf-pro-text_semibold.woff2 woff2 swap
Size 230 KB
Load time 0 ms
Start 0 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 127 KB
Load time 0 ms
Start 0 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 216 KB
Load time 0 ms
Start 0 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_regular.... woff2 swap
Size 115 KB
Load time 0 ms
Start 0 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_bold.woff2 woff2 swap
Size 228 KB
Load time 0 ms
Start 0 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 ~458 KB and ~916 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+
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
44 requests over 0ms
INFO

Performance analysis not available for this result.

Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
11% of JavaScript execution is third-party
First-party Third-party 309ms · 0KB · $2/mo
Unattributable
Other
Costly
Execution 309ms
Transfer 0 KB
Monthly Cost $2/mo

These scripts may cost more than they're worth

  • Unattributable adds 309ms and costs ~$2/month

Unattributable takes 309ms 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.

Send Feedback