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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
5
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
65
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
86
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
75
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.

3.27 s

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

11.97 s

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

164 ms

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

0.061

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

3.86 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.

12.93 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
7 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
19.6 MB transferred, 83 requests
FIX
19.6 MB transferred, 83 requests
Critical::
Page weighs 23.7 MB (19.6 MB transferred)
Warning::
Images are 4.8 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 4.8 MB
Info::
Fonts are 778 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 778 KB
Info::
83 HTTP requests
Info::
Estimated 4.1 g CO2 per page load
19.6 MB / 2.4 MB budget
19.6 MB transferred
83 requests
4.1 g CO2 per page load
Other 13.8 MiB 70%
Images 4.8 MiB 24%
Fonts 778.3 KiB 4%
JavaScript 174.5 KiB 1%
HTML 59.5 KiB 0%
CSS 57.7 KiB 0%
Other 3.0 KiB 0%
Other 1.2 KiB 0%
Other 736 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

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 (19.6 MiB of 19.6 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
4658ms total JS execution
FIX
4658ms total JS execution
Warning::
Unattributable: 1888ms CPU time
Warning::
https://alexa.amazon.com/about: 1700ms CPU time
Warning::
https://m.media-amazon.com/images/I/11zuylp74DL._R...: 731ms CPU time
Warning::
https://m.media-amazon.com/images/I/71KPXWmUoBL.js...: 250ms CPU time
Info::
https://m.media-amazon.com/images/I/31hBbkGGC6L.js...: 89ms CPU time
Warning::
Third-party scripts: 4658ms (100% of total)

Main Thread Breakdown

Other 47% Script Evaluation 30% Style & Layout 13% Script Parsing & Compilation 4% Rendering 3%
ScriptTotalScriptingParse/CompileParty
Unattributable1888ms22ms0ms3rd
https://alexa.amazon.com/about1700ms486ms77ms3rd
https://m.media-amazon.com/images/I/11zuylp74DL._RC%7C61xJcNKKLXL.js,11Y+5x+kkTL.js,518IfuPC2lL.js,115zbyk371L.js,11GgN1+C7hL.js,313nCSj5srL.js,01VRMV3FBdL.js,21NadQlXUWL.js,01E8f3KV-NL.js,11a7qqY8xXL.js,11aZNVRA-EL.js,51C4kaFbiAL.js,11J9B4cvO1L.js,11wb9K3sw0L.js,11BrgrMAHUL.js,11GPhx42StL.js,210X-JWUe-L.js,01Svfxfy8OL.js,619CEU--1tL.js,01ikBbTAneL.js,316Rfi6yEVL.js,319aVrJ-hdL.js,31R7GWnfVoL.js,11F929pmpYL.js,31mosk8yNCL.js,01qkmZhGmAL.js,31rqCOnXDNL.js,011FfPwYqHL.js,21Xgf5G-ZWL.js,21ILzqwYe6L.js,21kN0q4IA-L.js,21HZlWnI+gL.js,11vb6P5C5AL.js,01rpjf4IWYL.js_.js?AUIClients/AmazonUI731ms576ms69ms3rd
https://m.media-amazon.com/images/I/71KPXWmUoBL.js?AUIClients/IdentitySSOJsSDK250ms198ms50ms3rd
https://m.media-amazon.com/images/I/31hBbkGGC6L.js?AUIClients/MarsContentGridAssets89ms80ms3ms3rd
D
Page Weight Inventory
Action
83 resources · 19.6 MB · 93 KB savings available
FIX
83 resources · 19.6 MB · 93 KB savings available
Warning::
Page weight 18.6 MB over 1MB target
Got: 19.6 MB Expected: ≤ 1 MB
Info::
~93 KB of savings available
Warning::
82 third-party resources (100% of weight)
Info::
5 resources over 200KB
83 resources · 19.6 MiB · 82 third-party 18.6 MiB over 1MB target
Media 70% · 13.8 MiB
Image 24% · 4.8 MiB
Font 4% · 778.3 KiB
JavaScript 1% · 175.2 KiB
Document 0% · 59.5 KiB
CSS 0% · 57.7 KiB
Other 0% · 2.2 KiB

~93.0 KiB of savings available

Remove unused JavaScript: 93.0 KiB
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
28 images, 0 KB saveable
REVIEW
28 images, 0 KB saveable
Warning::
https://images-na.ssl-images-amazon.com/images/G/0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://m.media-amazon.com/images/G/01/kindle/jour... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://m.media-amazon.com/images/G/01/kindle/jour... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://m.media-amazon.com/images/G/01/kindle/NavB... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://m.media-amazon.com/images/G/01/kindle/jour... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://m.media-amazon.com/images/G/01/kindle/jour... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://m.media-amazon.com/images/G/01/kindle/jour... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://m.media-amazon.com/images/G/01/kindle/jour... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://m.media-amazon.com/images/G/01/kindle/jour... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://m.media-amazon.com/images/G/01/kindle/jour... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
28 images 4.8 MB
0 oversized -0 KB
20 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 Bundles
15 scripts, 93 KB unused
REVIEW
15 scripts, 93 KB unused
Warning::
https://m.media-amazon.com/images/I/11zuylp74DL._R...: 72 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://m.media-amazon.com/images/I/71KPXWmUoBL.js...: 21 KB unused (61%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 93 KB
93 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://m.media-amazon.com/images/I/11zuylp74DL._RC%7C61xJcNKKLXL.js,11Y+5x+kkTL.js,518IfuPC2lL.js,115zbyk371L.js,11GgN1+C7hL.js,313nCSj5srL.js,01VRMV3FBdL.js,21NadQlXUWL.js,01E8f3KV-NL.js,11a7qqY8xXL.js,11aZNVRA-EL.js,51C4kaFbiAL.js,11J9B4cvO1L.js,11wb9K3sw0L.js,11BrgrMAHUL.js,11GPhx42StL.js,210X-JWUe-L.js,01Svfxfy8OL.js,619CEU--1tL.js,01ikBbTAneL.js,316Rfi6yEVL.js,319aVrJ-hdL.js,31R7GWnfVoL.js,11F929pmpYL.js,31mosk8yNCL.js,01qkmZhGmAL.js,31rqCOnXDNL.js,011FfPwYqHL.js,21Xgf5G-ZWL.js,21ILzqwYe6L.js,21kN0q4IA-L.js,21HZlWnI+gL.js,11vb6P5C5AL.js,01rpjf4IWYL.js_.js?AUIClients/AmazonUI108 KB72 KB (67%)✓3rd
https://m.media-amazon.com/images/I/71KPXWmUoBL.js?AUIClients/IdentitySSOJsSDK35 KB21 KB (61%)✓3rd
https://m.media-amazon.com/images/I/01pdDwb82LL.js?AUIClients/CentaurusUIMarkupAssets-CentaurusUIMshopEgressAssets2 KB—✓3rd
https://m.media-amazon.com/images/I/31J+-jfT4VL.js?AUIClients/CentaurusUIMarkupAssets-CentaurusUIVideoAssets5 KB—✓3rd
https://m.media-amazon.com/images/I/11MxNbfQyvL.js?AUIClients/CentaurusUIMarkupAssets-CentaurusUIAjaxActionButtonAssets2 KB—✓3rd
https://m.media-amazon.com/images/I/219p3urYuKL.js?AUIClients/CentaurusUIMarkupAssets-CentaurusUIWlpInjectableAssets3 KB—✓3rd
https://m.media-amazon.com/images/I/21b2FscBj4L.js?AUIClients/EregionWidgetFoundryAssets2 KB—✓3rd
https://m.media-amazon.com/images/I/11GYl-VycLL.js?AUIClients/MarsUtilityAssets2 KB—✓3rd
https://m.media-amazon.com/images/I/21O8JVW8dYL.js?AUIClients/MarsNavStripeAssets3 KB—✓3rd
https://m.media-amazon.com/images/I/31hBbkGGC6L.js?AUIClients/MarsContentGridAssets4 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

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
22 fonts (778 KB)
PASS
22 fonts (778 KB)
Info::
22 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

22

778 KB total

Render-blocking

0

of 22

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 FCP 3.3 s LCP 12.0 shttps://m.media-amazon.com/images/S/sash/pDxWAF1pBB0dzGB.woff2pDxWAF1pBB0dzGB.woff2 https://m.media-amazon.com/images/S/sash/pDxWAF1pBB0dzGB.woff2 — 17.0 KiB — 16 ms — font-display: swaphttps://m.media-amazon.com/images/G/01/kindle/mako/features/efw/EmberModernDisplayStd-Bold.woff2EmberModernDisplayStd-B... https://m.media-amazon.com/images/G/01/kindle/mako/features/efw/EmberModernDisplayStd-Bold.woff2 — 76.3 KiB — 11 ms — font-display: swaphttps://m.media-amazon.com/images/S/sash/KFPk-9IF4FqAqY-.woff2KFPk-9IF4FqAqY-.woff2 https://m.media-amazon.com/images/S/sash/KFPk-9IF4FqAqY-.woff2 — 16.8 KiB — 9 ms — font-display: swaphttps://m.media-amazon.com/images/G/01/kindle/mako/features/efw/EmberModernDisplayStd-Regular.woff2EmberModernDisplayStd-R... https://m.media-amazon.com/images/G/01/kindle/mako/features/efw/EmberModernDisplayStd-Regular.woff2 — 76.2 KiB — 11 ms — font-display: swaphttps://m.media-amazon.com/images/S/sash/Dv1WQ5DdeMS5qP7.woff2Dv1WQ5DdeMS5qP7.woff2 https://m.media-amazon.com/images/S/sash/Dv1WQ5DdeMS5qP7.woff2 — 28.0 KiB — 28 ms — font-display: swaphttps://m.media-amazon.com/images/S/sash/VjTR4RqBzY0mUYx.woff2VjTR4RqBzY0mUYx.woff2 https://m.media-amazon.com/images/S/sash/VjTR4RqBzY0mUYx.woff2 — 21.7 KiB — 28 ms — font-display: swaphttps://m.media-amazon.com/images/S/sash/WOnTLzkiaEccV7F.woff2WOnTLzkiaEccV7F.woff2 https://m.media-amazon.com/images/S/sash/WOnTLzkiaEccV7F.woff2 — 17.7 KiB — 20 ms — font-display: swaphttps://m.media-amazon.com/images/S/sash/2SazJx$EeTHfhMN.woff22SazJx$EeTHfhMN.woff2 https://m.media-amazon.com/images/S/sash/2SazJx$EeTHfhMN.woff2 — 17.8 KiB — 22 ms — font-display: swaphttps://m.media-amazon.com/images/S/sash/ozb5-CLHQWI6Soc.woff2ozb5-CLHQWI6Soc.woff2 https://m.media-amazon.com/images/S/sash/ozb5-CLHQWI6Soc.woff2 — 29.3 KiB — 30 ms — font-display: swaphttps://m.media-amazon.com/images/S/sash/KwhNPG8Jz-Vz2X7.woff2KwhNPG8Jz-Vz2X7.woff2 https://m.media-amazon.com/images/S/sash/KwhNPG8Jz-Vz2X7.woff2 — 23.4 KiB — 29 ms — font-display: swaphttps://m.media-amazon.com/images/S/sash/lZemoC3awOEEzLR.woff2lZemoC3awOEEzLR.woff2 https://m.media-amazon.com/images/S/sash/lZemoC3awOEEzLR.woff2 — 41.0 KiB — 31 ms — font-display: swaphttps://m.media-amazon.com/images/S/sash/NvWNxKhmDbgI1lq.woff2NvWNxKhmDbgI1lq.woff2 https://m.media-amazon.com/images/S/sash/NvWNxKhmDbgI1lq.woff2 — 41.9 KiB — 92 ms — font-display: swaphttps://m.media-amazon.com/images/S/sash/1Ep1kWVX5g73xrY.woff21Ep1kWVX5g73xrY.woff2 https://m.media-amazon.com/images/S/sash/1Ep1kWVX5g73xrY.woff2 — 40.7 KiB — 93 ms — font-display: swaphttps://m.media-amazon.com/images/S/sash/pnZF3$c0rgepEUt.woff2pnZF3$c0rgepEUt.woff2 https://m.media-amazon.com/images/S/sash/pnZF3$c0rgepEUt.woff2 — 41.7 KiB — 35 ms — font-display: swaphttps://m.media-amazon.com/images/S/sash/Wdqa3S7nfGc3Naj.woff2Wdqa3S7nfGc3Naj.woff2 https://m.media-amazon.com/images/S/sash/Wdqa3S7nfGc3Naj.woff2 — 40.9 KiB — 42 ms — font-display: swaphttps://m.media-amazon.com/images/S/sash/-w6hwcDxlefrOYI.woff2-w6hwcDxlefrOYI.woff2 https://m.media-amazon.com/images/S/sash/-w6hwcDxlefrOYI.woff2 — 42.3 KiB — 64 ms — font-display: swaphttps://m.media-amazon.com/images/S/sash/gyrV-mLs7VcgiFC.woff2gyrV-mLs7VcgiFC.woff2 https://m.media-amazon.com/images/S/sash/gyrV-mLs7VcgiFC.woff2 — 33.8 KiB — 88 ms — font-display: swaphttps://m.media-amazon.com/images/S/sash/8AuIu4whVB5EMoJ.woff28AuIu4whVB5EMoJ.woff2 https://m.media-amazon.com/images/S/sash/8AuIu4whVB5EMoJ.woff2 — 34.9 KiB — 95 ms — font-display: swaphttps://m.media-amazon.com/images/S/sash/MexTn601PAhMvAn.woff2MexTn601PAhMvAn.woff2 https://m.media-amazon.com/images/S/sash/MexTn601PAhMvAn.woff2 — 33.5 KiB — 84 ms — font-display: swaphttps://m.media-amazon.com/images/S/sash/rlTCFdyUZFR9mQI.woff2rlTCFdyUZFR9mQI.woff2 https://m.media-amazon.com/images/S/sash/rlTCFdyUZFR9mQI.woff2 — 34.4 KiB — 83 ms — font-display: swaphttps://m.media-amazon.com/images/S/sash/ukoYNzKrqDRxhTq.woff2ukoYNzKrqDRxhTq.woff2 https://m.media-amazon.com/images/S/sash/ukoYNzKrqDRxhTq.woff2 — 33.7 KiB — 83 ms — font-display: swaphttps://m.media-amazon.com/images/S/sash/1yLvxs7jafx7AW$.woff21yLvxs7jafx7AW$.woff2 https://m.media-amazon.com/images/S/sash/1yLvxs7jafx7AW$.woff2 — 35.1 KiB — 85 ms — font-display: swap
pDxWAF1pBB0dzGB.woff2 woff2 swap
Size 17 KB
Load time 16 ms
Start 578 ms
Risk FOUT — text flashes from fallback to web font
EmberModernDisplayStd-B... woff2 swap
Size 76 KB
Load time 11 ms
Start 582 ms
Risk FOUT — text flashes from fallback to web font
KFPk-9IF4FqAqY-.woff2 woff2 swap
Size 17 KB
Load time 9 ms
Start 646 ms
Risk FOUT — text flashes from fallback to web font
EmberModernDisplayStd-R... woff2 swap
Size 76 KB
Load time 11 ms
Start 648 ms
Risk FOUT — text flashes from fallback to web font
Dv1WQ5DdeMS5qP7.woff2 woff2 swap
Size 28 KB
Load time 28 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
VjTR4RqBzY0mUYx.woff2 woff2 swap
Size 22 KB
Load time 28 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
WOnTLzkiaEccV7F.woff2 woff2 swap
Size 18 KB
Load time 20 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
2SazJx$EeTHfhMN.woff2 woff2 swap
Size 18 KB
Load time 22 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
ozb5-CLHQWI6Soc.woff2 woff2 swap
Size 29 KB
Load time 30 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
KwhNPG8Jz-Vz2X7.woff2 woff2 swap
Size 23 KB
Load time 29 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
lZemoC3awOEEzLR.woff2 woff2 swap
Size 41 KB
Load time 31 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
NvWNxKhmDbgI1lq.woff2 woff2 swap
Size 42 KB
Load time 92 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
1Ep1kWVX5g73xrY.woff2 woff2 swap
Size 41 KB
Load time 93 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
pnZF3$c0rgepEUt.woff2 woff2 swap
Size 42 KB
Load time 35 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
Wdqa3S7nfGc3Naj.woff2 woff2 swap
Size 41 KB
Load time 42 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
-w6hwcDxlefrOYI.woff2 woff2 swap
Size 42 KB
Load time 64 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
gyrV-mLs7VcgiFC.woff2 woff2 swap
Size 34 KB
Load time 88 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
8AuIu4whVB5EMoJ.woff2 woff2 swap
Size 35 KB
Load time 95 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
MexTn601PAhMvAn.woff2 woff2 swap
Size 34 KB
Load time 84 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
rlTCFdyUZFR9mQI.woff2 woff2 swap
Size 34 KB
Load time 83 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
ukoYNzKrqDRxhTq.woff2 woff2 swap
Size 34 KB
Load time 83 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
1yLvxs7jafx7AW$.woff2 woff2 swap
Size 35 KB
Load time 85 ms
Start 1.6 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)
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
83 requests over 1825ms
INFO
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https://fls-na.amazon.com/1/batch/1/OP/ATVPDKIKX0DER:133-0390121-0990561:3Q4VB9YNX9JNMKXHYEQY$uedata=s:%2Fuedata%2Fuedata%3Fld%26v%3D0.343361.0%26id%3D3Q4VB9YNX9JNMKXHYEQY%26sw%3D412%26sh%3D823%26vw%3D412%26vh%3D823%26m%3D1%26sc%3D3Q4VB9YNX9JNMKXHYEQY%26ue%3D3%26bb%3D103%26be%3D403%26fp%3D344%26fcp%3D344%26pc%3D1134%26tc%3D-384%26na_%3D-384%26ul_%3D-1776803318055%26_ul%3D-1776803318055%26rd_%3D-1776803318055%26_rd%3D-1776803318055%26fe_%3D-221%26lk_%3D-221%26_lk%3D-221%26co_%3D-221%26_co%3D-221%26sc_%3D-1776803318055%26rq_%3D-220%26rs_%3D-20%26_rs%3D99%26dl_%3D-9%26di_%3D464%26de_%3D464%26_de%3D465%26_dc%3D1134%26ld_%3D1134%26_ld%3D-1776803318055%26ntd%3D0%26ty%3D0%26rc%3D0%26hob%3D2%26hoe%3D3%26ld%3D1135%26t%3D1776803319190%26ctb%3D1%26rt%3D__ld%3A42-13-7-15-3-9-1%26csmtags%3Daui%7Caui%3Aaui_build_date%3A3.26.3-2026-04-07%7Cfls-na-amazon-com%7Cadblk_no%7Caui%3Acss%3Anetwork%7Caui%3Acss%3Acache%7Caui%3Ajs%3Anetwork%26viz%3Dvisible%3A3%26pty%3DMetis%26spty%3DPreSigninPage%26pti%3Dundefined%26tid%3D3Q4VB9YNX9JNMKXHYEQY%26aftb%3D1%26lob%3D0:1138 — 200 — 149 B — 72 ms — h2https://fls-na.amazon.com/1/batch/1/OP/ATVPDKIKX0DER:133-0390121-0990561:3Q4VB9YNX9JNMKXHYEQY$uedata=s:%2Fuedata%2Fuedata%3Fld%26v%3D0.343361.0%26id%3D3Q4VB9YNX9JNMKXHYEQY%26sc0%3DcsmCELLSframework%26bb0%3D406%26pc0%3D407%26ld0%3D407%26t0%3D1776803318462%26sc1%3DcsmCELLSpdm%26bb1%3D407%26pc1%3D423%26ld1%3D423%26t1%3D1776803318478%26sc2%3DcsmCELLSvpm%26bb2%3D423%26pc2%3D424%26ld2%3D424%26t2%3D1776803318479%26sc3%3DcsmCELLSfem%26bb3%3D424%26pc3%3D424%26ld3%3D424%26t3%3D1776803318479%26ctb%3D1:1138fls-na.amazon.com/1/batch/1/OP/ATVP... https://fls-na.amazon.com/1/batch/1/OP/ATVPDKIKX0DER:133-0390121-0990561:3Q4VB9YNX9JNMKXHYEQY$uedata=s:%2Fuedata%2Fuedata%3Fld%26v%3D0.343361.0%26id%3D3Q4VB9YNX9JNMKXHYEQY%26sc0%3DcsmCELLSframework%26bb0%3D406%26pc0%3D407%26ld0%3D407%26t0%3D1776803318462%26sc1%3DcsmCELLSpdm%26bb1%3D407%26pc1%3D423%26ld1%3D423%26t1%3D1776803318478%26sc2%3DcsmCELLSvpm%26bb2%3D423%26pc2%3D424%26ld2%3D424%26t2%3D1776803318479%26sc3%3DcsmCELLSfem%26bb3%3D424%26pc3%3D424%26ld3%3D424%26t3%3D1776803318479%26ctb%3D1:1138 — 200 — 148 B — 74 ms — h2https://unagi.amazon.com/1/events/com.amazon.csm.csa.produnagi.amazon.com/1/events/com.amazo... https://unagi.amazon.com/1/events/com.amazon.csm.csa.prod — 200 — 596 B — 298 ms — http/1.1https://unagi.amazon.com/1/events/com.amazon.csm.customsg.produnagi.amazon.com/1/events/com.amazo... https://unagi.amazon.com/1/events/com.amazon.csm.customsg.prod — 200 — 596 B — 232 ms — http/1.1https://images-na.ssl-images-amazon.com/images/I/31LYmZEs45L.jsimages-na.ssl-images-amazon.com/ima... https://images-na.ssl-images-amazon.com/images/I/31LYmZEs45L.js — 200 — 3.8 KiB — 117 ms — h3https://fls-na.amazon.com/1/batch/1/OP/ATVPDKIKX0DER:133-0390121-0990561:3Q4VB9YNX9JNMKXHYEQY$uedata=s:%2Fuedata%2Fuedata%3Fat%26v%3D0.343361.0%26id%3D3Q4VB9YNX9JNMKXHYEQY%26m%3D1%26sc%3Dcsa%3Alcp%26lcp%3D372%26pc%3D1153%26at%3D1153%26t%3D1776803319208%26pty%3DMetis%26spty%3DPreSigninPage%26pti%3Dundefined%26tid%3D3Q4VB9YNX9JNMKXHYEQY%26aftb%3D1%26lob%3D0:1153fls-na.amazon.com/1/batch/1/OP/ATVP... https://fls-na.amazon.com/1/batch/1/OP/ATVPDKIKX0DER:133-0390121-0990561:3Q4VB9YNX9JNMKXHYEQY$uedata=s:%2Fuedata%2Fuedata%3Fat%26v%3D0.343361.0%26id%3D3Q4VB9YNX9JNMKXHYEQY%26m%3D1%26sc%3Dcsa%3Alcp%26lcp%3D372%26pc%3D1153%26at%3D1153%26t%3D1776803319208%26pty%3DMetis%26spty%3DPreSigninPage%26pti%3Dundefined%26tid%3D3Q4VB9YNX9JNMKXHYEQY%26aftb%3D1%26lob%3D0:1153 — 200 — 150 B — 74 ms — h2https://m.media-amazon.com/images/G/01/Metis/alexa-wordmark.pngm.media-amazon.com/images/G/01/Meti... https://m.media-amazon.com/images/G/01/Metis/alexa-wordmark.png — 200 — 2.0 KiB — 84 ms — h3https://m.media-amazon.com/images/S/sash/Dv1WQ5DdeMS5qP7.woff2m.media-amazon.com/images/S/sash/Dv... https://m.media-amazon.com/images/S/sash/Dv1WQ5DdeMS5qP7.woff2 — 200 — 28.0 KiB — 28 ms — h3https://m.media-amazon.com/images/S/sash/VjTR4RqBzY0mUYx.woff2m.media-amazon.com/images/S/sash/Vj... https://m.media-amazon.com/images/S/sash/VjTR4RqBzY0mUYx.woff2 — 200 — 21.7 KiB — 28 ms — h3https://m.media-amazon.com/images/S/sash/WOnTLzkiaEccV7F.woff2m.media-amazon.com/images/S/sash/WO... https://m.media-amazon.com/images/S/sash/WOnTLzkiaEccV7F.woff2 — 200 — 17.7 KiB — 20 ms — h3https://m.media-amazon.com/images/S/sash/2SazJx$EeTHfhMN.woff2m.media-amazon.com/images/S/sash/2S... https://m.media-amazon.com/images/S/sash/2SazJx$EeTHfhMN.woff2 — 200 — 17.8 KiB — 22 ms — h3https://m.media-amazon.com/images/S/sash/ozb5-CLHQWI6Soc.woff2m.media-amazon.com/images/S/sash/oz... https://m.media-amazon.com/images/S/sash/ozb5-CLHQWI6Soc.woff2 — 200 — 29.3 KiB — 30 ms — h3https://m.media-amazon.com/images/S/sash/KwhNPG8Jz-Vz2X7.woff2m.media-amazon.com/images/S/sash/Kw... https://m.media-amazon.com/images/S/sash/KwhNPG8Jz-Vz2X7.woff2 — 200 — 23.4 KiB — 29 ms — h3https://m.media-amazon.com/images/S/sash/lZemoC3awOEEzLR.woff2m.media-amazon.com/images/S/sash/lZ... https://m.media-amazon.com/images/S/sash/lZemoC3awOEEzLR.woff2 — 200 — 41.0 KiB — 31 ms — h3https://m.media-amazon.com/images/S/sash/NvWNxKhmDbgI1lq.woff2m.media-amazon.com/images/S/sash/Nv... https://m.media-amazon.com/images/S/sash/NvWNxKhmDbgI1lq.woff2 — 200 — 41.9 KiB — 92 ms — h3https://m.media-amazon.com/images/S/sash/1Ep1kWVX5g73xrY.woff2m.media-amazon.com/images/S/sash/1E... https://m.media-amazon.com/images/S/sash/1Ep1kWVX5g73xrY.woff2 — 200 — 40.7 KiB — 93 ms — h3https://m.media-amazon.com/images/S/sash/pnZF3$c0rgepEUt.woff2m.media-amazon.com/images/S/sash/pn... https://m.media-amazon.com/images/S/sash/pnZF3$c0rgepEUt.woff2 — 200 — 41.7 KiB — 35 ms — h3https://m.media-amazon.com/images/S/sash/Wdqa3S7nfGc3Naj.woff2m.media-amazon.com/images/S/sash/Wd... https://m.media-amazon.com/images/S/sash/Wdqa3S7nfGc3Naj.woff2 — 200 — 40.9 KiB — 42 ms — h3https://m.media-amazon.com/images/S/sash/-w6hwcDxlefrOYI.woff2m.media-amazon.com/images/S/sash/-w... https://m.media-amazon.com/images/S/sash/-w6hwcDxlefrOYI.woff2 — 200 — 42.3 KiB — 64 ms — h3https://m.media-amazon.com/images/S/sash/gyrV-mLs7VcgiFC.woff2m.media-amazon.com/images/S/sash/gy... https://m.media-amazon.com/images/S/sash/gyrV-mLs7VcgiFC.woff2 — 200 — 33.8 KiB — 88 ms — h3https://m.media-amazon.com/images/S/sash/8AuIu4whVB5EMoJ.woff2m.media-amazon.com/images/S/sash/8A... https://m.media-amazon.com/images/S/sash/8AuIu4whVB5EMoJ.woff2 — 200 — 34.9 KiB — 95 ms — h3https://m.media-amazon.com/images/S/sash/MexTn601PAhMvAn.woff2m.media-amazon.com/images/S/sash/Me... https://m.media-amazon.com/images/S/sash/MexTn601PAhMvAn.woff2 — 200 — 33.5 KiB — 84 ms — h3https://m.media-amazon.com/images/S/sash/rlTCFdyUZFR9mQI.woff2m.media-amazon.com/images/S/sash/rl... https://m.media-amazon.com/images/S/sash/rlTCFdyUZFR9mQI.woff2 — 200 — 34.4 KiB — 83 ms — h3https://m.media-amazon.com/images/S/sash/ukoYNzKrqDRxhTq.woff2m.media-amazon.com/images/S/sash/uk... https://m.media-amazon.com/images/S/sash/ukoYNzKrqDRxhTq.woff2 — 200 — 33.7 KiB — 83 ms — h3https://m.media-amazon.com/images/S/sash/1yLvxs7jafx7AW$.woff2m.media-amazon.com/images/S/sash/1y... https://m.media-amazon.com/images/S/sash/1yLvxs7jafx7AW$.woff2 — 200 — 35.1 KiB — 85 ms — h3https://fls-na.amazon.com/1/batch/1/OP/ATVPDKIKX0DER:133-0390121-0990561:3Q4VB9YNX9JNMKXHYEQY$uedata=s:%2Fuedata%2Fuedata%3Fat%26v%3D0.343361.0%26id%3D3Q4VB9YNX9JNMKXHYEQY%26m%3D1%26sc%3Dcsa%3Avl50%26vl50%3D164%26pc%3D3644%26at%3D3644%26t%3D1776803321699%26pty%3DMetis%26spty%3DPreSigninPage%26pti%3Dundefined%26tid%3D3Q4VB9YNX9JNMKXHYEQY%26aftb%3D1%26lob%3D0:3645fls-na.amazon.com/1/batch/1/OP/ATVP... https://fls-na.amazon.com/1/batch/1/OP/ATVPDKIKX0DER:133-0390121-0990561:3Q4VB9YNX9JNMKXHYEQY$uedata=s:%2Fuedata%2Fuedata%3Fat%26v%3D0.343361.0%26id%3D3Q4VB9YNX9JNMKXHYEQY%26m%3D1%26sc%3Dcsa%3Avl50%26vl50%3D164%26pc%3D3644%26at%3D3644%26t%3D1776803321699%26pty%3DMetis%26spty%3DPreSigninPage%26pti%3Dundefined%26tid%3D3Q4VB9YNX9JNMKXHYEQY%26aftb%3D1%26lob%3D0:3645 — -1 — 0 B — 0 ms — https://fls-na.amazon.com/1/batch/1/OP/ATVPDKIKX0DER:133-0390121-0990561:3Q4VB9YNX9JNMKXHYEQY$uedata=s:%2Fuedata%2Fuedata%3Fat%26v%3D0.343361.0%26id%3D3Q4VB9YNX9JNMKXHYEQY%26m%3D1%26sc%3Dcsa%3Avl90%26vl90%3D759%26pc%3D3645%26at%3D3645%26t%3D1776803321700%26pty%3DMetis%26spty%3DPreSigninPage%26pti%3Dundefined%26tid%3D3Q4VB9YNX9JNMKXHYEQY%26aftb%3D1%26lob%3D0:3645fls-na.amazon.com/1/batch/1/OP/ATVP... https://fls-na.amazon.com/1/batch/1/OP/ATVPDKIKX0DER:133-0390121-0990561:3Q4VB9YNX9JNMKXHYEQY$uedata=s:%2Fuedata%2Fuedata%3Fat%26v%3D0.343361.0%26id%3D3Q4VB9YNX9JNMKXHYEQY%26m%3D1%26sc%3Dcsa%3Avl90%26vl90%3D759%26pc%3D3645%26at%3D3645%26t%3D1776803321700%26pty%3DMetis%26spty%3DPreSigninPage%26pti%3Dundefined%26tid%3D3Q4VB9YNX9JNMKXHYEQY%26aftb%3D1%26lob%3D0:3645 — -1 — 0 B — 0 ms — https://fls-na.amazon.com/1/batch/1/OP/ATVPDKIKX0DER:133-0390121-0990561:3Q4VB9YNX9JNMKXHYEQY$uedata=s:%2Fuedata%2Fuedata%3Fat%26v%3D0.343361.0%26id%3D3Q4VB9YNX9JNMKXHYEQY%26m%3D1%26sc%3Dcsa%3Avl100%26vl100%3D759%26pc%3D3645%26at%3D3645%26t%3D1776803321700%26pty%3DMetis%26spty%3DPreSigninPage%26pti%3Dundefined%26tid%3D3Q4VB9YNX9JNMKXHYEQY%26aftb%3D1%26lob%3D0:3645fls-na.amazon.com/1/batch/1/OP/ATVP... https://fls-na.amazon.com/1/batch/1/OP/ATVPDKIKX0DER:133-0390121-0990561:3Q4VB9YNX9JNMKXHYEQY$uedata=s:%2Fuedata%2Fuedata%3Fat%26v%3D0.343361.0%26id%3D3Q4VB9YNX9JNMKXHYEQY%26m%3D1%26sc%3Dcsa%3Avl100%26vl100%3D759%26pc%3D3645%26at%3D3645%26t%3D1776803321700%26pty%3DMetis%26spty%3DPreSigninPage%26pti%3Dundefined%26tid%3D3Q4VB9YNX9JNMKXHYEQY%26aftb%3D1%26lob%3D0:3645 — -1 — 0 B — 0 ms —
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 4658ms · 207KB · $27/mo
Unattributable
Other
Costly
Execution 1888ms
Transfer 0 KB
Monthly Cost $11/mo
alexa.amazon.com
Other
Costly
Execution 1700ms
Transfer 59 KB
Monthly Cost $10/mo
m.media-amazon.com
Other
Costly
Execution 731ms
Transfer 108 KB
Unused 67%
Monthly Cost $4/mo
m.media-amazon.com
Other
Costly
Execution 250ms
Transfer 35 KB
Unused 61%
Monthly Cost $1/mo
m.media-amazon.com
Other
Optional
Execution 89ms
Transfer 4 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 1888ms and costs ~$11/month
  • alexa.amazon.com adds 1700ms and costs ~$10/month
  • m.media-amazon.com adds 731ms and costs ~$4/month
  • m.media-amazon.com adds 250ms and costs ~$1/month

100% 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

Unattributable takes 1888ms 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

alexa.amazon.com takes 1700ms 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

m.media-amazon.com takes 731ms 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 m.media-amazon.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

m.media-amazon.com takes 250ms 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

61% of m.media-amazon.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

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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