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Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
5
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
33
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
91
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
73
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
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.

1.96 s

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

9.13 s

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

2.00 s

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

0.191

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

5.05 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.

15.92 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
7 PASS 2 REVIEW 5 FIX
D
Page Weight Budget
Action
2.4 MB transferred, 133 requests
FIX
2.4 MB transferred, 133 requests
Info::
Page weighs 8.0 MB (2.4 MB transferred)
Warning::
JavaScript is 1.1 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.1 MB
Warning::
133 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.50 g CO2 per page load
2.4 MB / 2.4 MB budget
2.4 MB transferred
133 requests
0.50 g CO2 per page load
JavaScript 1.1 MiB 48%
Images 679.8 KiB 28%
Other 284.0 KiB 12%
Other 98.2 KiB 4%
Other 86.5 KiB 4%
HTML 80.4 KiB 3%
Fonts 40.7 KiB 2%
Other 2.0 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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

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
97% third-party, 0 ms blocking
FIX
97% third-party, 0 ms blocking
Warning::
Third-party code accounts for 97% of page weight (2.3 MiB of 2.4 MiB)
Info::
Third-party blocking time is low (0 ms)
97%
First-party Third-party
F
JS Execution Cost
Action
6793ms total JS execution
FIX
6793ms total JS execution
Warning::
Unattributable: 1663ms CPU time
Warning::
https://assets.msn.com/bundles/v1/homePage/latest/...: 1389ms CPU time
Warning::
https://www.msn.com/fr-fr?fastFallbackOnModuleUnav...: 839ms CPU time
Warning::
https://assets.msn.com/staticsb/statics/latest/js/...: 542ms CPU time
Warning::
https://assets.msn.com/bundles/v1/homePage/latest/...: 450ms CPU time
Warning::
Third-party scripts: 5955ms (88% of total)

Main Thread Breakdown

Script Evaluation 63% Other 18% Script Parsing & Compilation 7% Style & Layout 5%
ScriptTotalScriptingParse/CompileParty
Unattributable1663ms750ms0ms3rd
https://assets.msn.com/bundles/v1/homePage/latest/mobile/common.7ffc11d8d20f9decafc9.js1389ms1155ms120ms3rd
https://www.msn.com/fr-fr?fastFallbackOnModuleUnavailable=1839ms187ms39ms1st
https://assets.msn.com/staticsb/statics/latest/js/thirdparty/tmt/v1/fr-fr_script.js542ms532ms9ms3rd
https://assets.msn.com/bundles/v1/homePage/latest/mobile/microsoft.7872c396d332f4813bd8.js450ms236ms45ms3rd
https://assets.msn.com/staticsb/statics/latest/oneTrust/2.4/scripttemplates/202601.1.0/otBannerSdk.js413ms238ms41ms3rd
https://assets.msn.com/bundles/v1/homePage/latest/mobile/libs_feed-layout_dist_card-templates_infopane-card_InfopaneCardData_js-libs_feed-layout_dist_-b060e5.685035f530dacacfe2ea.js351ms304ms4ms3rd
https://assets.msn.com/bundles/v1/homePage/latest/mobile/experiences_social-bar-wc_dist_index_js.71a7976765e54be72fd9.js201ms159ms12ms3rd
https://assets.msn.com/staticsb/statics/latest/auth/msal-browser-4.24.0.min.js150ms121ms24ms3rd
https://adsdk.microsoft.com/ast/ast.js140ms102ms19ms3rd

Showing top 10 of 18 scripts

F
JS Bundles
Action
35 scripts, 819 KB unused
FIX
35 scripts, 819 KB unused
Warning::
https://assets.msn.com/bundles/v1/homePage/latest/...: 164 KB unused (73%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://assets.msn.com/bundles/v1/homePage/latest/...: 164 KB unused (73%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://assets.msn.com/bundles/v1/homePage/latest/...: 151 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://assets.msn.com/staticsb/statics/latest/one...: 62 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://assets.msn.com/bundles/v1/homePage/latest/...: 53 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 819 KB
819 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://assets.msn.com/bundles/v1/homePage/latest/mobile/experiences_unified-mobile-feed_dist_index_js.4751ee049a319b24b779.js0 KB164 KB (73%)✓3rd
https://assets.msn.com/bundles/v1/homePage/latest/mobile/experiences_unified-mobile-feed_dist_index_js.4751ee049a319b24b779.js51 KB164 KB (73%)✓3rd
https://assets.msn.com/bundles/v1/homePage/latest/mobile/common.7ffc11d8d20f9decafc9.js328 KB151 KB (46%)✓3rd
https://assets.msn.com/staticsb/statics/latest/oneTrust/2.4/scripttemplates/202601.1.0/otBannerSdk.js128 KB62 KB (49%)✓3rd
https://assets.msn.com/bundles/v1/homePage/latest/mobile/experiences_display-ads-wc_dist_index_js.2fa3c90db2714b2ebfda.js28 KB53 KB (48%)✓3rd
https://assets.msn.com/bundles/v1/homePage/latest/mobile/experiences_display-ads-wc_dist_index_js.2fa3c90db2714b2ebfda.js0 KB53 KB (48%)✓3rd
https://assets.msn.com/staticsb/statics/latest/auth/msal-browser-4.24.0.min.js76 KB46 KB (64%)✓3rd
https://adsdk.microsoft.com/ast/ast.js51 KB38 KB (74%)✓3rd
https://assets.msn.com/bundles/v1/homePage/latest/mobile/microsoft.7872c396d332f4813bd8.js101 KB36 KB (36%)✓3rd
https://assets.msn.com/bundles/v1/homePage/latest/mobile/umfChannelDataProvider.1da4384c2d16121c7dc3.js38 KB27 KB (72%)✓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

D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: no-store,no-cache
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-store,no-cache

DirectiveValueMeaning
no-store—Never cache this response
no-cache—Cache but always revalidate first
B
Image Optimization
42 images, 0 KB saveable
REVIEW
42 images, 0 KB saveable
Info::
All images are well-optimized
42 images 680 KB
0 oversized -0 KB
42 legacy format
0 missing dimensions CLS risk
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
1 fonts (41 KB)
PASS
1 fonts (41 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

41 KB total

Render-blocking

0

of 1

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s 9.0 s FCP 2.0 s LCP 9.1 shttps://assets.msn.com/statics/fonts/SegoeUI-Roman-VF-subset_web.woff2SegoeUI-Roman-VF-subset... https://assets.msn.com/statics/fonts/SegoeUI-Roman-VF-subset_web.woff2 — 40.7 KiB — 0 ms — font-display: swap
SegoeUI-Roman-VF-subset... woff2 swap
Size 41 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
65 hints, 0 missing preconnects
PASS
65 hints, 0 missing preconnects
Info::
Page uses 65 resource hint(s)

Current Resource Hints

preconnect
+1
11
preload
+33
43
dns-prefetch
9
prefetch
2

65 resource hints configured

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
133 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
88% of JavaScript execution is third-party
First-party Third-party 5955ms · 865KB · €65/mo
Unattributable
Other
Costly
Execution 1663ms
Transfer 0 KB
Monthly Cost €18/mo
assets.msn.com
Other
Costly
Execution 1389ms
Transfer 328 KB
Unused 46%
Monthly Cost €15/mo
assets.msn.com
Other
Costly
Execution 542ms
Transfer 29 KB
Monthly Cost €6/mo
assets.msn.com
Other
Costly
Execution 450ms
Transfer 101 KB
Unused 36%
Monthly Cost €5/mo
assets.msn.com
Other
Costly
Execution 413ms
Transfer 128 KB
Unused 49%
Monthly Cost €4/mo
assets.msn.com
Other
Costly
Execution 351ms
Transfer 18 KB
Monthly Cost €4/mo
assets.msn.com
Other
Costly
Execution 201ms
Transfer 30 KB
Monthly Cost €2/mo
assets.msn.com
Other
Optional
Execution 150ms
Transfer 76 KB
Unused 64%
Monthly Cost €2/mo
adsdk.microsoft.com
Other
Optional
Execution 140ms
Transfer 51 KB
Unused 74%
Monthly Cost €2/mo
assets.msn.com
Other
Optional
Execution 125ms
Transfer 4 KB
Monthly Cost €1/mo
btloader.com
Other
Optional
Execution 100ms
Transfer 30 KB
Monthly Cost €1/mo
assets.msn.com
Other
Optional
Execution 92ms
Transfer 10 KB
Monthly Cost €1/mo
assets.msn.com
Other
Optional
Execution 81ms
Transfer 0 KB
Unused 73%
Monthly Cost €1/mo
assets.msn.com
Other
Optional
Execution 80ms
Transfer 0 KB
Unused 48%
Monthly Cost €1/mo
assets.msn.com
Other
Optional
Execution 72ms
Transfer 24 KB
Monthly Cost €1/mo
assets.msn.com
Other
Optional
Execution 54ms
Transfer 21 KB
Monthly Cost €1/mo
assets.msn.com
Other
Optional
Execution 52ms
Transfer 18 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Unattributable adds 1663ms and costs ~€18/month
  • assets.msn.com adds 1389ms and costs ~€15/month
  • assets.msn.com adds 542ms and costs ~€6/month
  • assets.msn.com adds 450ms and costs ~€5/month
  • assets.msn.com adds 413ms and costs ~€4/month
  • assets.msn.com adds 351ms and costs ~€4/month
  • assets.msn.com adds 201ms and costs ~€2/month

88% 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 1663ms 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

assets.msn.com takes 1389ms 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

assets.msn.com takes 542ms 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

assets.msn.com takes 450ms 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

assets.msn.com takes 413ms 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

assets.msn.com takes 351ms 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

assets.msn.com takes 201ms 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

64% of assets.msn.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

74% of adsdk.microsoft.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

73% of assets.msn.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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