Performance
· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
1.21 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.05 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
130 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.004
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
1.55 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.
3.11 s
Page Load Progression
579 ms
1.2 s
1.7 s
2.3 s
2.9 s
3.5 s 4.0 s
4.6 sFPage Weight BudgetAction4.6 MB transferred, 304 requestsFIX
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.
Source: web.dev
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.
Source: web.dev
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.
Source: web.dev
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DJS Execution CostAction2049ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 786ms | 32ms | 0ms | 3rd |
| https://www.ebay.co.uk/ | 753ms | 281ms | 15ms | 3rd |
| https://www.ebay.co.uk/ifh/ifh-vendor0909758836facad3e08a.js | 247ms | 215ms | 27ms | 3rd |
| https://ir.ebaystatic.com/rs/c/globalheaderweb/index_lcNW.2510dd25.js | 75ms | 52ms | 13ms | 3rd |
| https://ir.ebaystatic.com/cr/v/c1/globalheader_widget_platform__v2-b70676194b.js | 68ms | 27ms | 19ms | 3rd |
| https://ir.ebaystatic.com/cr/v/c01/89466f2c-a8ad-4fb1-83ee-683e13ae2786.min.js | 62ms | 60ms | 2ms | 3rd |
| https://ir.ebaystatic.com/rs/c/discoveryplatformweb/_CHv4gJEL.js | 58ms | 7ms | 2ms | 3rd |
DJS BundlesAction27 scripts, 358 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.ebay.co.uk/ifh/ifh-vendor0909758836facad3e08a.js | 279 KB | 164 KB (59%) | ✓ | 3rd |
| https://ir.ebaystatic.com/rs/c/discoveryplatformweb/_CHv4gJEL.js | 194 KB | 136 KB (70%) | ✓ | 3rd |
| https://www.ebay.co.uk/ifh/ifh915415ef327025582dd5.js | 76 KB | 33 KB (44%) | ✓ | 3rd |
| https://ir.ebaystatic.com/rs/c/globalheaderweb/index_lcNW.2510dd25.js | 61 KB | 25 KB (42%) | ✓ | 3rd |
| https://ir.ebaystatic.com/cr/v/c01/250701JZ48C6XWVCKCN2.js | 8 KB | — | ✓ | 3rd |
| https://ir.ebaystatic.com/cr/v/c01/ac-031226184928.dweb.min.js?callback=jsonp_1776363451214_9997 | 22 KB | — | ✓ | 3rd |
| https://ir.ebaystatic.com/cr/ebay-rum/cdn-assets/logs.ebb041e86c5338dbe8f6.bundle.js | 19 KB | — | ✓ | 3rd |
| https://ir.ebaystatic.com/cr/v/c01/code.jquery.com_jquery-3.7.1.min.js | 28 KB | — | ✓ | 3rd |
| https://ir.ebaystatic.com/rs/c/globalheaderweb/runtime.582565b4.js | 1 KB | — | ✓ | 3rd |
| https://ir.ebaystatic.com/rs/c/discoveryplatformweb/_Cyhc9onp.js | 1 KB | — | ✓ | 3rd |
Consider code splitting or tree shaking to reduce unused code.
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.
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.
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.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
DPage Weight InventoryAction304 resources · 4.6 MB · 358 KB savings availableFIX
~358.2 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 304 resources | 4.6 MiB | ||||||
DHTTP CachingActionno-store (uncacheable)FIX
max-age=0, no-cache, no-store
| Directive | Value | Meaning |
|---|---|---|
| max-age | 0 | Cache for 0 seconds |
| no-cache | — | Cache but always revalidate first |
| no-store | — | Never cache this response |
CImage OptimizationAction54 images, 0 KB saveableREVIEW
Set explicit width and height to prevent CLS.
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.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
A+Font Loading2 fonts (51 KB)PASS
Web fonts
2
51 KB total
Render-blocking
0
of 2
Dominant font-display
swap
Most common across fonts
Font loading timeline
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 CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
Network Waterfall304 requests over 4627msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 786ms | 0 KB | — | £4/mo | Costly |
www.ebay.co.uk www.ebay.co.uk | Other | 753ms | 73 KB | — | £4/mo | Costly |
www.ebay.co.uk www.ebay.co.uk | Other | 247ms | 279 KB | 59% | £1/mo | Costly |
ir.ebaystatic.com ir.ebaystatic.com | Other | 75ms | 61 KB | 42% | £0/mo | Optional |
ir.ebaystatic.com ir.ebaystatic.com | Other | 68ms | 4 KB | — | £0/mo | Optional |
ir.ebaystatic.com ir.ebaystatic.com | Other | 62ms | 19 KB | — | £0/mo | Optional |
ir.ebaystatic.com ir.ebaystatic.com | Other | 58ms | 194 KB | 70% | £0/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 786ms and costs ~£4/month
- www.ebay.co.uk adds 753ms and costs ~£4/month
- www.ebay.co.uk adds 247ms and costs ~£1/month
100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.
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 786ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
www.ebay.co.uk takes 753ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
www.ebay.co.uk takes 247ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
59% of www.ebay.co.uk's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
70% of ir.ebaystatic.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev