Performance
· 17 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.
6.35 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
15.89 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
2.26 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.646
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
12.45 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.
22.19 s
Page Load Progression
FPage Weight BudgetAction5.9 MB transferred, 137 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
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.
Source: web.dev
Subset fonts to include only used characters, or switch to system font stacks.
Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).
Source: web.dev font loading
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
FJS Execution CostAction8671ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.xbox.com/en-HK/ | 1684ms | 40ms | 47ms | 3rd |
| Unattributable | 1212ms | 73ms | 0ms | 3rd |
| https://assets-xbxweb.xbox.com/xbox-web/static/js/client.1879560c.js | 1107ms | 939ms | 132ms | 3rd |
| https://cdnjs.cloudflare.com/ajax/libs/jquery/3.7.1/jquery.min.js | 1028ms | 521ms | 41ms | 3rd |
| https://assets-xbxweb.xbox.com/xbox-web/static/js/4278.cec36ae2.js | 699ms | 549ms | 104ms | 3rd |
| https://assets-xbxweb.xbox.com/xbox-web/static/js/ContentPage.6f8142e6.chunk.js | 635ms | 507ms | 17ms | 3rd |
| https://assets.adobedtm.com/launch-ENbcb8955aa2f84046af210e3226cdda04.min.js | 484ms | 413ms | 53ms | 3rd |
| https://www.microsoft.com/onerfstatics/marketingsites-eas-prod/shell/_scrf/js/themes=default/54-af9f9f/fb-2be034/21-f9d187/b0-50721e/d8-97d509/40-0bd7f9/ea-f1669e/9d-c6ea39/62-a72447/3e-a4ee50/7c-0bd6a1/60-37309a/db-bc0148/dc-7e9864/6d-c07ea1/6f-dafe8c/f6-aa5278/e6-5f3533/6d-1e7ed0/b7-cadaa7/62-2741f0/ca-40b7b0/4e-ee3a55/3e-f5c39b/c3-6454d7/f9-7592d3/d0-e64f3e/92-10345d/79-499886/7e-cda2d3/e7-1fe854/66-9d711a/38-b93a9e/de-884374/1f-100dea/33-abe4df/8f-61bee0?ver=2.0&_cf=02242021_3231&iife=1 | 214ms | 101ms | 19ms | 3rd |
| https://assets-xbxweb.xbox.com/xbox-web/static/js/mwf/mwf-auto-init-main.var.min.js | 204ms | 99ms | 55ms | 3rd |
| https://connect.facebook.net/en_US/fbevents.js | 176ms | 129ms | 46ms | 3rd |
Showing top 10 of 20 scripts
FJS BundlesAction54 scripts, 608 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://assets-xbxweb.xbox.com/xbox-web/static/js/client.1879560c.js | 281 KB | 195 KB (70%) | ✓ | 3rd |
| https://assets-xbxweb.xbox.com/xbox-web/static/js/4278.cec36ae2.js | 196 KB | 123 KB (63%) | ✓ | 3rd |
| https://assets-xbxweb.xbox.com/xbox-web/static/js/mwf/mwf-auto-init-main.var.min.js | 82 KB | 59 KB (73%) | ✓ | 3rd |
| https://connect.facebook.net/en_US/fbevents.js | 96 KB | 36 KB (37%) | ✓ | 3rd |
| https://wcpstatic.microsoft.com/mscc/lib/v2/wcp-consent.js | 52 KB | 29 KB (56%) | ✓ | 3rd |
| https://assets-xbxweb.xbox.com/xbox-web/static/js/6305.45044f2a.js | 71 KB | 29 KB (41%) | ✓ | 3rd |
| https://assets-xbxweb.xbox.com/xbox-web/static/js/ContentPage.6f8142e6.chunk.js | 30 KB | 28 KB (94%) | ✓ | 3rd |
| https://assets-xbxweb.xbox.com/xbox-web/static/js/7828.a5029d2d.chunk.js | 32 KB | 24 KB (74%) | ✓ | 3rd |
| https://assets-xbxweb.xbox.com/xbox-web/static/js/4814.2eb587ab.js | 77 KB | 24 KB (39%) | ✓ | 3rd |
| https://www.microsoft.com/onerfstatics/marketingsites-eas-prod/shell/_scrf/js/themes=default/54-af9f9f/fb-2be034/21-f9d187/b0-50721e/d8-97d509/40-0bd7f9/ea-f1669e/9d-c6ea39/62-a72447/3e-a4ee50/7c-0bd6a1/60-37309a/db-bc0148/dc-7e9864/6d-c07ea1/6f-dafe8c/f6-aa5278/e6-5f3533/6d-1e7ed0/b7-cadaa7/62-2741f0/ca-40b7b0/4e-ee3a55/3e-f5c39b/c3-6454d7/f9-7592d3/d0-e64f3e/92-10345d/79-499886/7e-cda2d3/e7-1fe854/66-9d711a/38-b93a9e/de-884374/1f-100dea/33-abe4df/8f-61bee0?ver=2.0&_cf=02242021_3231&iife=1 | 37 KB | 21 KB (57%) | ✓ | 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
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
FPage Weight InventoryAction137 resources · 5.9 MB · 608 KB savings availableFIX
~608.2 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 137 resources | 5.9 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction42 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
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
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
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
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
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
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.
Performance issues directly impact user engagement and conversion rates.
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 Loading7 fonts (261 KB)PASS
Web fonts
7
261 KB total
Render-blocking
0
of 7
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Convert to woff2 for ~30% smaller file size
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 ~22 KB and ~44 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource Hints15 hints, 0 missing preconnectsPASS
Current Resource Hints
15 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall137 requests over 7826msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.xbox.com www.xbox.com | Other | 1684ms | 54 KB | — | $10/mo | Costly |
Unattributable Unattributable | Other | 1212ms | 0 KB | — | $7/mo | Costly |
assets-xbxweb.xbox.com assets-xbxweb.xbox.com | Other | 1107ms | 281 KB | 70% | $6/mo | Costly |
cdnjs cdnjs.cloudflare.com | CDN | 1028ms | 27 KB | — | $6/mo | Costly |
assets-xbxweb.xbox.com assets-xbxweb.xbox.com | Other | 699ms | 196 KB | 63% | $4/mo | Costly |
assets-xbxweb.xbox.com assets-xbxweb.xbox.com | Other | 635ms | 30 KB | 94% | $4/mo | Costly |
assets.adobedtm.com assets.adobedtm.com | Other | 484ms | 23 KB | — | $3/mo | Costly |
www.microsoft.com www.microsoft.com | Other | 214ms | 37 KB | 57% | $1/mo | Costly |
assets-xbxweb.xbox.com assets-xbxweb.xbox.com | Other | 204ms | 82 KB | 73% | $1/mo | Costly |
Facebook Pixel connect.facebook.net | Advertising | 176ms | 96 KB | 37% | $1/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 171ms | 47 KB | — | $1/mo | Optional |
mem.gfx.ms mem.gfx.ms | Other | 160ms | 61 KB | — | $1/mo | Optional |
www.xbox.com www.xbox.com | Other | 158ms | 2 KB | — | $1/mo | Optional |
assets-xbxweb.xbox.com assets-xbxweb.xbox.com | Other | 158ms | 77 KB | 39% | $1/mo | Optional |
assets-xbxweb.xbox.com assets-xbxweb.xbox.com | Other | 133ms | 20 KB | — | $1/mo | Optional |
assets-www.xbox.com assets-www.xbox.com | Other | 116ms | 42 KB | 79% | $1/mo | Optional |
assets-xbxweb.xbox.com assets-xbxweb.xbox.com | Other | 103ms | 52 KB | 40% | $1/mo | Optional |
www.xbox.com www.xbox.com | Other | 101ms | 64 KB | — | $1/mo | Optional |
mem.gfx.ms mem.gfx.ms | Other | 71ms | 10 KB | — | $0/mo | Optional |
www.xbox.com www.xbox.com | Other | 59ms | 2 KB | — | $0/mo | Optional |
These scripts may cost more than they're worth
- www.xbox.com adds 1684ms and costs ~$10/month
- Unattributable adds 1212ms and costs ~$7/month
- assets-xbxweb.xbox.com adds 1107ms and costs ~$6/month
- cdnjs adds 1028ms and costs ~$6/month
- assets-xbxweb.xbox.com adds 699ms and costs ~$4/month
- assets-xbxweb.xbox.com adds 635ms and costs ~$4/month
- assets.adobedtm.com adds 484ms and costs ~$3/month
- www.microsoft.com adds 214ms and costs ~$1/month
- assets-xbxweb.xbox.com adds 204ms 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
www.xbox.com takes 1684ms 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
Unattributable takes 1212ms 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
assets-xbxweb.xbox.com takes 1107ms 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
70% of assets-xbxweb.xbox.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
cdnjs takes 1028ms 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
assets-xbxweb.xbox.com takes 699ms 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
63% of assets-xbxweb.xbox.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
assets-xbxweb.xbox.com takes 635ms 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
94% of assets-xbxweb.xbox.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
assets.adobedtm.com takes 484ms 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.microsoft.com takes 214ms 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
57% of www.microsoft.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
assets-xbxweb.xbox.com takes 204ms 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
73% of assets-xbxweb.xbox.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
79% of assets-www.xbox.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