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Performance

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

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

Mobile Desktop
56
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
97
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
69
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.

538 ms

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

3.10 s

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

416 ms

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

0.065

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

2.95 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.

6.33 s

Page Load Progression

935 ms
1.9 s
2.8 s
3.7 s
4.7 s
5.6 s
6.5 s
7.5 s
Checks
14
5 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
5.4 MB transferred, 372 requests
FIX
5.4 MB transferred, 372 requests
Critical::
Page weighs 14.8 MB (5.4 MB transferred)
Warning::
Images are 2.4 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.4 MB
Warning::
JavaScript is 2.4 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.4 MB
Warning::
372 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.1 g CO2 per page load
5.4 MB / 2.4 MB budget
5.4 MB transferred
372 requests
1.1 g CO2 per page load
Images 2.4 MiB 45%
JavaScript 2.4 MiB 43%
Other 398.0 KiB 7%
Other 123.7 KiB 2%
HTML 51.0 KiB 1%
Other 48.4 KiB 1%
Fonts 40.7 KiB 1%
Other 3.6 KiB 0%
CSS 2.4 KiB 0%
Other 0 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

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
99% third-party, 0 ms blocking
FIX
99% third-party, 0 ms blocking
Warning::
Third-party code accounts for 99% of page weight (5.4 MiB of 5.4 MiB)
Info::
Third-party blocking time is low (0 ms)
99%
First-party Third-party
F
JS Execution Cost
Action
3874ms total JS execution
FIX
3874ms total JS execution
Warning::
https://www.msn.com/fr-fr: 1031ms CPU time
Warning::
https://assets.msn.com/bundles/v1/homePage/latest/...: 999ms CPU time
Warning::
Unattributable: 475ms CPU time
Warning::
https://assets.msn.com/bundles/v1/homePage/latest/...: 433ms CPU time
Info::
https://assets.msn.com/staticsb/statics/latest/js/...: 161ms CPU time
Warning::
Third-party scripts: 2842ms (73% of total)

Main Thread Breakdown

Script Evaluation 52% Other 26% Style & Layout 8% Script Parsing & Compilation 6% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://www.msn.com/fr-fr1031ms35ms3ms1st
https://assets.msn.com/bundles/v1/homePage/latest/microsoft.4abc9b9a594fae03a52c.js999ms765ms16ms3rd
Unattributable475ms23ms0ms3rd
https://assets.msn.com/bundles/v1/homePage/latest/common.57fc6de006dfee680e90.js433ms343ms35ms3rd
https://assets.msn.com/staticsb/statics/latest/js/thirdparty/tmt/v1/fr-fr_script.js161ms131ms2ms3rd
https://assets.msn.com/bundles/v1/homePage/latest/waterfall-view-feed.72a1de187ebc78d794e9.js135ms129ms1ms3rd
https://assets.msn.com/bundles/v1/homePage/latest/libs_edgechromium-wpo-promotion-util_dist_EdgeChromiumUXMessasgeHelper_js-libs_feed-layout-co-40f9f7.b9b2b8af8b71d964c705.js93ms86ms6ms3rd
https://assets.msn.com/bundles/v1/homePage/latest/experience.4291c5c08378e8bf7b67.js80ms23ms16ms3rd
https://assets.msn.com/staticsb/statics/latest/js/thirdparty/adsdk/MSCMP/1.0.3/abfbc578471c8b100464.js72ms42ms15ms3rd
https://btloader.com/tag?o=6208086025961472&upapi=true63ms47ms8ms3rd

Showing top 10 of 16 scripts

F
JS Bundles
Action
105 scripts, 580 KB unused
FIX
105 scripts, 580 KB unused
Warning::
https://assets.msn.com/bundles/v1/homePage/latest/...: 178 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://assets.msn.com/bundles/v1/homePage/latest/...: 39 KB unused (36%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://assets.msn.com/bundles/v1/homePage/latest/...: 39 KB unused (36%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://assets.msn.com/bundles/v1/homePage/latest/...: 39 KB unused (58%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://assets.msn.com/bundles/v1/homePage/latest/...: 38 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 580 KB
580 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://assets.msn.com/bundles/v1/homePage/latest/common.57fc6de006dfee680e90.js375 KB178 KB (47%)✓3rd
https://assets.msn.com/bundles/v1/homePage/latest/experiences_display-ads-wc_dist_index_js.7ec7a191b2908dd8d73b.js0 KB39 KB (36%)✓3rd
https://assets.msn.com/bundles/v1/homePage/latest/experiences_display-ads-wc_dist_index_js.7ec7a191b2908dd8d73b.js27 KB39 KB (36%)✓3rd
https://assets.msn.com/bundles/v1/homePage/latest/libs_edgechromium-wpo-promotion-util_dist_EdgeChromiumUXMessasgeHelper_js-libs_feed-layout-co-40f9f7.b9b2b8af8b71d964c705.js67 KB39 KB (58%)✓3rd
https://assets.msn.com/bundles/v1/homePage/latest/experience.4291c5c08378e8bf7b67.js86 KB38 KB (45%)✓3rd
https://assets.msn.com/bundles/v1/homePage/latest/microsoft.4abc9b9a594fae03a52c.js104 KB36 KB (35%)✓3rd
https://assets.msn.com/bundles/v1/homePage/latest/card-actions-wc.58fed0c7f1052ba7d42f.js47 KB31 KB (67%)✓3rd
https://assets.msn.com/bundles/v1/homePage/latest/getFeedManager.e99ba339043bf367d927.js64 KB30 KB (48%)✓3rd
https://assets.msn.com/bundles/v1/homePage/latest/nas-highlight-v1.fbab9cb9d0bfbb71ce5c.js66 KB29 KB (44%)✓3rd
https://assets.msn.com/staticsb/statics/latest/auth/msal-browser-4.24.0.min.js76 KB28 KB (64%)✓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
192 images, 0 KB saveable
REVIEW
192 images, 0 KB saveable
Info::
All images are well-optimized
192 images 2.4 MB
0 oversized -0 KB
191 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 FCP 538 ms LCP 3.1 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
372 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
73% of JavaScript execution is third-party
First-party Third-party 2842ms · 954KB · €31/mo
assets.msn.com
Other
Costly
Execution 999ms
Transfer 104 KB
Unused 35%
Monthly Cost €11/mo
Unattributable
Other
Costly
Execution 475ms
Transfer 0 KB
Monthly Cost €5/mo
assets.msn.com
Other
Costly
Execution 433ms
Transfer 375 KB
Unused 47%
Monthly Cost €5/mo
assets.msn.com
Other
Optional
Execution 161ms
Transfer 29 KB
Monthly Cost €2/mo
assets.msn.com
Other
Optional
Execution 135ms
Transfer 11 KB
Monthly Cost €1/mo
assets.msn.com
Other
Optional
Execution 93ms
Transfer 67 KB
Unused 58%
Monthly Cost €1/mo
assets.msn.com
Other
Optional
Execution 80ms
Transfer 86 KB
Unused 45%
Monthly Cost €1/mo
assets.msn.com
Other
Optional
Execution 72ms
Transfer 84 KB
Monthly Cost €1/mo
btloader.com
Other
Optional
Execution 63ms
Transfer 30 KB
Unused 79%
Monthly Cost €1/mo
assets.msn.com
Other
Optional
Execution 61ms
Transfer 20 KB
Monthly Cost €1/mo
adsdk.microsoft.com
Other
Optional
Execution 60ms
Transfer 51 KB
Unused 46%
Monthly Cost €1/mo
assets.msn.com
Other
Optional
Execution 56ms
Transfer 28 KB
Monthly Cost €1/mo
assets.msn.com
Other
Optional
Execution 52ms
Transfer 0 KB
Monthly Cost €1/mo
assets.msn.com
Other
Optional
Execution 51ms
Transfer 43 KB
Monthly Cost €1/mo
assets.msn.com
Other
Optional
Execution 50ms
Transfer 25 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • assets.msn.com adds 999ms and costs ~€11/month
  • Unattributable adds 475ms and costs ~€5/month
  • assets.msn.com adds 433ms and costs ~€5/month

73% 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

assets.msn.com takes 999ms 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

Unattributable takes 475ms 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 433ms 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

58% 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

79% of btloader.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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