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Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
68
GRADE
D
FIX
5
REVIEW
2
PASS
5
INFO
2

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

Mobile Desktop
72
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.
77
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
83
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

1.24 s

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

1.77 s

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

285 ms

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

0.015

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

2.85 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.

6.25 s

Page Load Progression

714 ms
1.4 s
2.1 s
2.9 s
3.6 s
4.3 s
5.0 s
5.7 s
Checks
14
5 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
3.8 MB transferred, 210 requests
FIX
3.8 MB transferred, 210 requests
Warning::
Page weighs 11.5 MB (3.8 MB transferred)
Warning::
JavaScript is 2.0 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.0 MB
Warning::
Images are 1.3 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.3 MB
Warning::
210 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.80 g CO2 per page load
3.8 MB / 2.4 MB budget
3.8 MB transferred
210 requests
0.80 g CO2 per page load
JavaScript 2.0 MiB 52%
Images 1.3 MiB 33%
Other 242.3 KiB 6%
HTML 168.2 KiB 4%
CSS 112.2 KiB 3%
Fonts 51.3 KiB 1%
Other 8.4 KiB 0%
Other 3.8 KiB 0%
Other 222 B 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

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

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

D
Third-Party Impact
Action
81% third-party, 0 ms blocking
FIX
81% third-party, 0 ms blocking
Warning::
Third-party code accounts for 81% of page weight (3.1 MiB of 3.8 MiB)
Info::
Third-party blocking time is low (0 ms)
19%
81%
First-party Third-party
D
JS Execution Cost
Action
2540ms total JS execution
FIX
2540ms total JS execution
Warning::
https://www.ebay.com/: 675ms CPU time
Warning::
Unattributable: 523ms CPU time
Warning::
https://www.ebay.com/ifh/ifh-vendor6745c0450bef4bd...: 278ms CPU time
Info::
https://ir.ebaystatic.com/rs/c/globalheaderweb/ind...: 220ms CPU time
Info::
https://ir.ebaystatic.com/cr/v/c1/globalheader_wid...: 171ms CPU time
Warning::
Third-party scripts: 1478ms (58% of total)

Main Thread Breakdown

Script Evaluation 50% Other 24% Script Parsing & Compilation 9% Style & Layout 8% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://www.ebay.com/675ms235ms41ms1st
Unattributable523ms61ms0ms3rd
https://www.ebay.com/ifh/ifh-vendor6745c0450bef4bd655ad.js278ms244ms30ms1st
https://ir.ebaystatic.com/rs/c/globalheaderweb/index_lcNW.e335b722.js220ms130ms24ms3rd
https://ir.ebaystatic.com/cr/v/c1/globalheader_widget_platform__v2-b70676194b.js171ms63ms45ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-1070599711134ms105ms14ms3rd
https://www.ebay.com/buyer-preferences/shipping-address?entryPageId=4624852108ms56ms9ms1st
https://www.googletagmanager.com/gtag/js?id=AW-1005566788&cx=c&gtm=4e6420h285ms70ms13ms3rd
https://ir.ebaystatic.com/rs/c/buyerprefs/entry.client-DpY5KGjq.js75ms62ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=DC-13341218&cx=c&gtm=4e6420h275ms61ms13ms3rd

Showing top 10 of 13 scripts

F
JS Bundles
Action
80 scripts, 690 KB unused
FIX
80 scripts, 690 KB unused
Warning::
https://ir.ebaystatic.com/rs/c/discoveryplatformwe...: 189 KB unused (72%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.ebay.com/ifh/ifh-vendor6745c0450bef4bd...: 136 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://ir.ebaystatic.com/rs/c/buyerprefs/buyer-pr...: 64 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=DC-133...: 57 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-100...: 55 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 690 KB
690 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://ir.ebaystatic.com/rs/c/discoveryplatformweb/_Byl6u2YB.js264 KB189 KB (72%)✓3rd
https://www.ebay.com/ifh/ifh-vendor6745c0450bef4bd655ad.js246 KB136 KB (55%)✓1st
https://ir.ebaystatic.com/rs/c/buyerprefs/buyer-preferences.shipping-address-BafmDCEN.js118 KB64 KB (55%)✓3rd
https://www.googletagmanager.com/gtag/js?id=DC-13341218&cx=c&gtm=4e6420h2130 KB57 KB (43%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-1005566788&cx=c&gtm=4e6420h2135 KB55 KB (41%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-1070599711147 KB52 KB (35%)✓3rd
https://connect.facebook.net/en_US/fbevents.js95 KB33 KB (35%)✓3rd
https://www.ebay.com/ifh/ifh72ce1bf332834fe517a2.js76 KB33 KB (44%)✓1st
https://ir.ebaystatic.com/rs/c/buyerprefs/jsx-runtime-BEJwbcy9.js42 KB26 KB (62%)✓3rd
https://ir.ebaystatic.com/rs/c/buyerprefs/entry.client-DpY5KGjq.js59 KB22 KB (38%)✓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

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

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.

B
Image Optimization
74 images, 0 KB saveable
REVIEW
74 images, 0 KB saveable
Warning::
https://ir.ebaystatic.com/cr/v/c1/1x1.gif is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
74 images 1.3 MB
0 oversized -0 KB
24 legacy format
1 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

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 (51 KB)
PASS
4 fonts (51 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

51 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 500 ms 1.0 s 1.5 s FCP 1.2 s LCP 1.8 shttps://ir.ebaystatic.com/cr/v/c1/market-sans/v2.0/MarketSans-Bold-WebS.woff2MarketSans-Bold-WebS.woff2 https://ir.ebaystatic.com/cr/v/c1/market-sans/v2.0/MarketSans-Bold-WebS.woff2 — 26.2 KiB — 0 ms — font-display: swaphttps://ir.ebaystatic.com/cr/v/c1/market-sans/v2.0/MarketSans-Regular-WebS.woff2MarketSans-Regular-WebS... https://ir.ebaystatic.com/cr/v/c1/market-sans/v2.0/MarketSans-Regular-WebS.woff2 — 25.1 KiB — 0 ms — font-display: swaphttps://ir.ebaystatic.com/cr/v/c1/market-sans/v2.0/MarketSans-Regular-WebS.woff2MarketSans-Regular-WebS... https://ir.ebaystatic.com/cr/v/c1/market-sans/v2.0/MarketSans-Regular-WebS.woff2 — 0 B — 0 ms — font-display: swaphttps://ir.ebaystatic.com/cr/v/c1/market-sans/v2.0/MarketSans-Bold-WebS.woff2MarketSans-Bold-WebS.woff2 https://ir.ebaystatic.com/cr/v/c1/market-sans/v2.0/MarketSans-Bold-WebS.woff2 — 0 B — 0 ms — font-display: swap
MarketSans-Bold-WebS.woff2 woff2 swap
Size 26 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
MarketSans-Regular-WebS... woff2 swap
Size 25 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
MarketSans-Regular-WebS... woff2 swap
Size 0 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
MarketSans-Bold-WebS.woff2 woff2 swap
Size 0 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
210 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
58% of JavaScript execution is third-party
First-party Third-party 1478ms · 680KB · $8/mo
Unattributable
Other
Costly
Execution 523ms
Transfer 0 KB
Monthly Cost $3/mo
ir.ebaystatic.com
Other
Costly
Execution 220ms
Transfer 0 KB
Monthly Cost $1/mo
ir.ebaystatic.com
Other
Optional
Execution 171ms
Transfer 0 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 134ms
Transfer 147 KB
Unused 35%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 85ms
Transfer 135 KB
Unused 41%
Monthly Cost $0/mo
ir.ebaystatic.com
Other
Optional
Execution 75ms
Transfer 59 KB
Unused 38%
Monthly Cost $0/mo
Google Tag Manager
Tag Manager
Optional
Execution 75ms
Transfer 130 KB
Unused 43%
Monthly Cost $0/mo
ir.ebaystatic.com
Other
Optional
Execution 75ms
Transfer 0 KB
Monthly Cost $0/mo
ir.ebaystatic.com
Other
Optional
Execution 69ms
Transfer 112 KB
Monthly Cost $0/mo
Facebook Pixel
Advertising
Optional
Execution 52ms
Transfer 95 KB
Unused 35%
Monthly Cost $0/mo

These scripts may cost more than they're worth

  • Unattributable adds 523ms and costs ~$3/month
  • ir.ebaystatic.com adds 220ms and costs ~$1/month

58% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

Unattributable takes 523ms 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

ir.ebaystatic.com takes 220ms 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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