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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
76
GRADE
C
FIX
4
REVIEW
3
PASS
6
INFO
2

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

Mobile Desktop
77
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.
81
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
91
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.

1.42 s

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

2.61 s

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

13 ms

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

0.110

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

1.56 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.

2.82 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
15
6 PASS 3 REVIEW 4 FIX
D
Page Weight Budget
Action
2.3 MB transferred, 42 requests
FIX
2.3 MB transferred, 42 requests
Info::
Page weighs 4.9 MB (2.3 MB transferred)
Info::
Fonts are 1.0 MB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 1.0 MB
Warning::
JavaScript is 664 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 664 KB
Info::
42 HTTP requests
Info::
Estimated 0.48 g CO2 per page load
2.3 MB / 2.4 MB budget
2.3 MB transferred
42 requests
0.48 g CO2 per page load
Fonts 1.0 MiB 46%
JavaScript 664.1 KiB 28%
Images 463.8 KiB 20%
CSS 68.7 KiB 3%
HTML 27.5 KiB 1%
Other 20.7 KiB 1%
Other 16.6 KiB 1%
Other 1.8 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Approaching limit

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

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

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (2.3 MiB of 2.3 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
5 scripts, 420 KB unused
FIX
5 scripts, 420 KB unused
Warning::
https://learn.microsoft.com/static/assets/0.4.0339...: 361 KB unused (69%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://js.monitor.azure.com/scripts/c/ms.jsll-4.m...: 30 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://wcpstatic.microsoft.com/mscc/lib/v2/wcp-co...: 29 KB unused (57%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 420 KB
420 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://learn.microsoft.com/static/assets/0.4.03396.7743-19995e1d/scripts/en-us/index-docs.js524 KB361 KB (69%)✓3rd
https://js.monitor.azure.com/scripts/c/ms.jsll-4.min.js75 KB30 KB (40%)✓3rd
https://wcpstatic.microsoft.com/mscc/lib/v2/wcp-consent.js52 KB29 KB (57%)✓3rd
https://learn.microsoft.com/_themes/docs.theme/master/en-us/_themes/global/deprecation.js3 KB—✓3rd
https://learn.microsoft.com/akam/13/488d17fd10 KB—✓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

F
Page Weight Inventory
Action
42 resources · 2.3 MB · 420 KB savings available
FIX
42 resources · 2.3 MB · 420 KB savings available
Warning::
Page weight 1.3 MB over 1MB target
Got: 2.3 MB Expected: ≤ 1 MB
Info::
~420 KB of savings available
Warning::
41 third-party resources (100% of weight)
Info::
3 resources over 200KB
42 resources · 2.3 MiB · 41 third-party 1.3 MiB over 1MB target
Font 46% · 1.0 MiB
JavaScript 28% · 664.1 KiB
Image 20% · 466.2 KiB
CSS 3% · 68.7 KiB
Other 2% · 35.8 KiB
Document 1% · 28.3 KiB

~419.9 KiB of savings available

Remove unused JavaScript: 419.9 KiB
B
Image Optimization
13 images, 0 KB saveable
REVIEW
13 images, 0 KB saveable
Info::
All images are well-optimized
13 images 464 KB
0 oversized -0 KB
10 legacy format
0 missing dimensions CLS risk
B
JS Execution Cost
504ms total JS execution
REVIEW
504ms total JS execution
Info::
https://learn.microsoft.com/static/assets/0.4.0339...: 173ms CPU time
Info::
Unattributable: 127ms CPU time
Info::
https://learn.microsoft.com/akam/13/488d17fd: 126ms CPU time
Info::
https://learn.microsoft.com/en-us/: 79ms CPU time
Warning::
Third-party scripts: 504ms (100% of total)

Main Thread Breakdown

Script Evaluation 40% Other 26% Style & Layout 17% Script Parsing & Compilation 11% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://learn.microsoft.com/static/assets/0.4.03396.7743-19995e1d/scripts/en-us/index-docs.js173ms81ms52ms3rd
Unattributable127ms4ms0ms3rd
https://learn.microsoft.com/akam/13/488d17fd126ms114ms3ms3rd
https://learn.microsoft.com/en-us/79ms2ms0ms3rd
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
2 fonts (1074 KB)
PASS
2 fonts (1074 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

1074 KB total

Render-blocking

0

of 2

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 2.0 s 2.5 s FCP 1.4 s LCP 2.6 shttps://learn.microsoft.com/static/assets/0.4.03396.7743-19995e1d/styles/docons.19995e1.7a2385d0.woff2docons.19995e1.7a2385d0... https://learn.microsoft.com/static/assets/0.4.03396.7743-19995e1d/styles/docons.19995e1.7a2385d0.woff2 — 24.1 KiB — 24 ms — font-display: swaphttps://learn.microsoft.com/static/third-party/SegoeUIVariable/SegoeUI-VF.ttfSegoeUI-VF.ttf https://learn.microsoft.com/static/third-party/SegoeUIVariable/SegoeUI-VF.ttf — 1.0 MiB — 71 ms — font-display: swap
docons.19995e1.7a2385d0... woff2 swap
Size 24 KB
Load time 24 ms
Start 535 ms
Risk FOUT — text flashes from fallback to web font
SegoeUI-VF.ttf ttf swap
Size 1050 KB
Load time 71 ms
Start 535 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
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 ~840 KB and ~1680 ms

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
A
HTTP Caching
max-age=600 (10 minutes)
PASS
max-age=600 (10 minutes)
Info::
Cache-Control header is set
Got: public,max-age=600
Info::
Effective TTL: 10 minutes (max-age=600)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

public,max-age=600

DirectiveValueMeaning
public—Any cache may store this response
max-age600Cache for 10 minutes
Effective TTL: 600 seconds
Network Waterfall
42 requests over 2693ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.4 s LCP 2.6 shttps://www.technet.com// https://www.technet.com/ — 301 — 479 B — 146 ms — h2https://learn.microsoft.com/learn.microsoft.com/ https://learn.microsoft.com/ — 302 — 1.8 KiB — 70 ms — h2https://learn.microsoft.com/en-us/learn.microsoft.com/en-us/ https://learn.microsoft.com/en-us/ — 200 — 27.5 KiB — 13 ms — h2https://learn.microsoft.com/static/assets/0.4.03396.7743-19995e1d/styles/site.csslearn.microsoft.com/static/assets/0... https://learn.microsoft.com/static/assets/0.4.03396.7743-19995e1d/styles/site.css — 200 — 68.7 KiB — 19 ms — h2https://wcpstatic.microsoft.com/mscc/lib/v2/wcp-consent.jswcpstatic.microsoft.com/mscc/lib/v2... https://wcpstatic.microsoft.com/mscc/lib/v2/wcp-consent.js — 200 — 52.3 KiB — 65 ms — h2https://js.monitor.azure.com/scripts/c/ms.jsll-4.min.jsjs.monitor.azure.com/scripts/c/ms.j... https://js.monitor.azure.com/scripts/c/ms.jsll-4.min.js — 200 — 74.9 KiB — 38 ms — h2https://learn.microsoft.com/_themes/docs.theme/master/en-us/_themes/global/deprecation.jslearn.microsoft.com/_themes/docs.th... https://learn.microsoft.com/_themes/docs.theme/master/en-us/_themes/global/deprecation.js — 200 — 3.3 KiB — 48 ms — h2https://learn.microsoft.com/static/assets/0.4.03396.7743-19995e1d/scripts/en-us/index-docs.jslearn.microsoft.com/static/assets/0... https://learn.microsoft.com/static/assets/0.4.03396.7743-19995e1d/scripts/en-us/index-docs.js — 200 — 524.1 KiB — 50 ms — h2https://learn.microsoft.com/akam/13/488d17fdlearn.microsoft.com/akam/13/488d17f... https://learn.microsoft.com/akam/13/488d17fd — 200 — 9.5 KiB — 54 ms — h2https://learn.microsoft.com/en-us/content-nav/site-header/site-header.json?learn.microsoft.com/en-us/content-n... https://learn.microsoft.com/en-us/content-nav/site-header/site-header.json? — 200 — 4.1 KiB — 14 ms — h2https://learn.microsoft.com/en-us/feature-rollout.jsonlearn.microsoft.com/en-us/feature-r... https://learn.microsoft.com/en-us/feature-rollout.json — 200 — 3.1 KiB — 20 ms — h2https://learn.microsoft.com/media/home-and-directory/home-hero_light.pnglearn.microsoft.com/media/home-and-... https://learn.microsoft.com/media/home-and-directory/home-hero_light.png — 302 — 1.8 KiB — 50 ms — h2https://learn.microsoft.com/media/home-and-directory/hero_mcp.pnglearn.microsoft.com/media/home-and-... https://learn.microsoft.com/media/home-and-directory/hero_mcp.png — 302 — 1.8 KiB — 52 ms — h2data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 2048 2048' %3E%3Cpath d='…www.w3.org/2000/svg' viewBox='0 0 2... data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 2048 2048' %3E%3Cpath d='… — 200 — 0 B — 0 ms — datahttps://learn.microsoft.com/media/common/ai-microchip.svglearn.microsoft.com/media/common/ai... https://learn.microsoft.com/media/common/ai-microchip.svg — 302 — 1.8 KiB — 145 ms — h2https://learn.microsoft.com/media/logos/logo_azure.svglearn.microsoft.com/media/logos/log... https://learn.microsoft.com/media/logos/logo_azure.svg — 302 — 1.8 KiB — 144 ms — h2https://learn.microsoft.com/media/logos/logo_copilot.svglearn.microsoft.com/media/logos/log... https://learn.microsoft.com/media/logos/logo_copilot.svg — 302 — 1.8 KiB — 145 ms — h2https://learn.microsoft.com/media/learn/instructor-led-badge.svglearn.microsoft.com/media/learn/ins... https://learn.microsoft.com/media/learn/instructor-led-badge.svg — 302 — 1.8 KiB — 145 ms — h2https://learn.microsoft.com/training/achievements/generic-badge.svglearn.microsoft.com/training/achiev... https://learn.microsoft.com/training/achievements/generic-badge.svg — 302 — 1.8 KiB — 145 ms — h2https://learn.microsoft.com/media/home-and-directory/icon-azure-cloud.svglearn.microsoft.com/media/home-and-... https://learn.microsoft.com/media/home-and-directory/icon-azure-cloud.svg — 302 — 1.8 KiB — 146 ms — h2https://learn.microsoft.com/static/assets/0.4.03396.7743-19995e1d/styles/docons.19995e1.7a2385d0.woff2learn.microsoft.com/static/assets/0... https://learn.microsoft.com/static/assets/0.4.03396.7743-19995e1d/styles/docons.19995e1.7a2385d0.woff2 — 200 — 24.1 KiB — 24 ms — h2https://learn.microsoft.com/static/third-party/SegoeUIVariable/SegoeUI-VF.ttflearn.microsoft.com/static/third-pa... https://learn.microsoft.com/static/third-party/SegoeUIVariable/SegoeUI-VF.ttf — 200 — 1.0 MiB — 71 ms — h2https://learn.microsoft.com/en-us/media/home-and-directory/home-hero_light.pnglearn.microsoft.com/en-us/media/hom... https://learn.microsoft.com/en-us/media/home-and-directory/home-hero_light.png — 200 — 318.4 KiB — 80 ms — h2https://learn.microsoft.com/en-us/media/home-and-directory/hero_mcp.pnglearn.microsoft.com/en-us/media/hom... https://learn.microsoft.com/en-us/media/home-and-directory/hero_mcp.png — 200 — 20.9 KiB — 34 ms — h2data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAASwAAACWCAYAAABkW7XSAAAQAElEQVR4AeycCZhUxbXHT3UPMwg4q…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAASwAAACWCAYAAABkW7XSAAAQAElEQVR4AeycCZhUxbXHT3UPMwg4q… — 200 — 0 B — 0 ms — datadata:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACGFjVEwAAAABAAAAAcMq2TYAAAANS…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACGFjVEwAAAABAAAAAcMq2TYAAAANS… — 200 — 0 B — 0 ms — datahttps://learn.microsoft.com/en-us/banners/index.jsonlearn.microsoft.com/en-us/banners/i... https://learn.microsoft.com/en-us/banners/index.json — 200 — 9.4 KiB — 21 ms — h2https://learn.microsoft.com/en-us/media/event-banners/banner-build-2026.pnglearn.microsoft.com/en-us/media/eve... https://learn.microsoft.com/en-us/media/event-banners/banner-build-2026.png — 200 — 62.0 KiB — 15 ms — h2https://learn.microsoft.com/en-us/media/common/ai-microchip.svglearn.microsoft.com/en-us/media/com... https://learn.microsoft.com/en-us/media/common/ai-microchip.svg — 200 — 7.0 KiB — 15 ms — h2https://learn.microsoft.com/en-us/media/logos/logo_azure.svglearn.microsoft.com/en-us/media/log... https://learn.microsoft.com/en-us/media/logos/logo_azure.svg — 200 — 2.8 KiB — 26 ms — h2
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.4 s LCP 2.6 shttps://www.technet.com// https://www.technet.com/ — 301 — 479 B — 146 ms — h2https://learn.microsoft.com/learn.microsoft.com/ https://learn.microsoft.com/ — 302 — 1.8 KiB — 70 ms — h2https://learn.microsoft.com/en-us/learn.microsoft.com/en-us/ https://learn.microsoft.com/en-us/ — 200 — 27.5 KiB — 13 ms — h2https://learn.microsoft.com/static/assets/0.4.03396.7743-19995e1d/styles/site.csslearn.microsoft.com/static/assets/0... https://learn.microsoft.com/static/assets/0.4.03396.7743-19995e1d/styles/site.css — 200 — 68.7 KiB — 19 ms — h2https://wcpstatic.microsoft.com/mscc/lib/v2/wcp-consent.jswcpstatic.microsoft.com/mscc/lib/v2... https://wcpstatic.microsoft.com/mscc/lib/v2/wcp-consent.js — 200 — 52.3 KiB — 65 ms — h2https://js.monitor.azure.com/scripts/c/ms.jsll-4.min.jsjs.monitor.azure.com/scripts/c/ms.j... https://js.monitor.azure.com/scripts/c/ms.jsll-4.min.js — 200 — 74.9 KiB — 38 ms — h2https://learn.microsoft.com/_themes/docs.theme/master/en-us/_themes/global/deprecation.jslearn.microsoft.com/_themes/docs.th... https://learn.microsoft.com/_themes/docs.theme/master/en-us/_themes/global/deprecation.js — 200 — 3.3 KiB — 48 ms — h2https://learn.microsoft.com/static/assets/0.4.03396.7743-19995e1d/scripts/en-us/index-docs.jslearn.microsoft.com/static/assets/0... https://learn.microsoft.com/static/assets/0.4.03396.7743-19995e1d/scripts/en-us/index-docs.js — 200 — 524.1 KiB — 50 ms — h2https://learn.microsoft.com/akam/13/488d17fdlearn.microsoft.com/akam/13/488d17f... https://learn.microsoft.com/akam/13/488d17fd — 200 — 9.5 KiB — 54 ms — h2https://learn.microsoft.com/en-us/content-nav/site-header/site-header.json?learn.microsoft.com/en-us/content-n... https://learn.microsoft.com/en-us/content-nav/site-header/site-header.json? — 200 — 4.1 KiB — 14 ms — h2https://learn.microsoft.com/en-us/feature-rollout.jsonlearn.microsoft.com/en-us/feature-r... https://learn.microsoft.com/en-us/feature-rollout.json — 200 — 3.1 KiB — 20 ms — h2https://learn.microsoft.com/media/home-and-directory/home-hero_light.pnglearn.microsoft.com/media/home-and-... https://learn.microsoft.com/media/home-and-directory/home-hero_light.png — 302 — 1.8 KiB — 50 ms — h2https://learn.microsoft.com/media/home-and-directory/hero_mcp.pnglearn.microsoft.com/media/home-and-... https://learn.microsoft.com/media/home-and-directory/hero_mcp.png — 302 — 1.8 KiB — 52 ms — h2data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 2048 2048' %3E%3Cpath d='…www.w3.org/2000/svg' viewBox='0 0 2... data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 2048 2048' %3E%3Cpath d='… — 200 — 0 B — 0 ms — datahttps://learn.microsoft.com/media/common/ai-microchip.svglearn.microsoft.com/media/common/ai... https://learn.microsoft.com/media/common/ai-microchip.svg — 302 — 1.8 KiB — 145 ms — h2https://learn.microsoft.com/media/logos/logo_azure.svglearn.microsoft.com/media/logos/log... https://learn.microsoft.com/media/logos/logo_azure.svg — 302 — 1.8 KiB — 144 ms — h2https://learn.microsoft.com/media/logos/logo_copilot.svglearn.microsoft.com/media/logos/log... https://learn.microsoft.com/media/logos/logo_copilot.svg — 302 — 1.8 KiB — 145 ms — h2https://learn.microsoft.com/media/learn/instructor-led-badge.svglearn.microsoft.com/media/learn/ins... https://learn.microsoft.com/media/learn/instructor-led-badge.svg — 302 — 1.8 KiB — 145 ms — h2https://learn.microsoft.com/training/achievements/generic-badge.svglearn.microsoft.com/training/achiev... https://learn.microsoft.com/training/achievements/generic-badge.svg — 302 — 1.8 KiB — 145 ms — h2https://learn.microsoft.com/media/home-and-directory/icon-azure-cloud.svglearn.microsoft.com/media/home-and-... https://learn.microsoft.com/media/home-and-directory/icon-azure-cloud.svg — 302 — 1.8 KiB — 146 ms — h2https://learn.microsoft.com/static/assets/0.4.03396.7743-19995e1d/styles/docons.19995e1.7a2385d0.woff2learn.microsoft.com/static/assets/0... https://learn.microsoft.com/static/assets/0.4.03396.7743-19995e1d/styles/docons.19995e1.7a2385d0.woff2 — 200 — 24.1 KiB — 24 ms — h2https://learn.microsoft.com/static/third-party/SegoeUIVariable/SegoeUI-VF.ttflearn.microsoft.com/static/third-pa... https://learn.microsoft.com/static/third-party/SegoeUIVariable/SegoeUI-VF.ttf — 200 — 1.0 MiB — 71 ms — h2https://learn.microsoft.com/en-us/media/home-and-directory/home-hero_light.pnglearn.microsoft.com/en-us/media/hom... https://learn.microsoft.com/en-us/media/home-and-directory/home-hero_light.png — 200 — 318.4 KiB — 80 ms — h2https://learn.microsoft.com/en-us/media/home-and-directory/hero_mcp.pnglearn.microsoft.com/en-us/media/hom... https://learn.microsoft.com/en-us/media/home-and-directory/hero_mcp.png — 200 — 20.9 KiB — 34 ms — h2data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAASwAAACWCAYAAABkW7XSAAAQAElEQVR4AeycCZhUxbXHT3UPMwg4q…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAASwAAACWCAYAAABkW7XSAAAQAElEQVR4AeycCZhUxbXHT3UPMwg4q… — 200 — 0 B — 0 ms — datadata:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACGFjVEwAAAABAAAAAcMq2TYAAAANS…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACGFjVEwAAAABAAAAAcMq2TYAAAANS… — 200 — 0 B — 0 ms — datahttps://learn.microsoft.com/en-us/banners/index.jsonlearn.microsoft.com/en-us/banners/i... https://learn.microsoft.com/en-us/banners/index.json — 200 — 9.4 KiB — 21 ms — h2https://learn.microsoft.com/en-us/media/event-banners/banner-build-2026.pnglearn.microsoft.com/en-us/media/eve... https://learn.microsoft.com/en-us/media/event-banners/banner-build-2026.png — 200 — 62.0 KiB — 15 ms — h2https://learn.microsoft.com/en-us/media/common/ai-microchip.svglearn.microsoft.com/en-us/media/com... https://learn.microsoft.com/en-us/media/common/ai-microchip.svg — 200 — 7.0 KiB — 15 ms — h2https://learn.microsoft.com/en-us/media/logos/logo_azure.svglearn.microsoft.com/en-us/media/log... https://learn.microsoft.com/en-us/media/logos/logo_azure.svg — 200 — 2.8 KiB — 26 ms — h2https://learn.microsoft.com/en-us/media/logos/logo_copilot.svglearn.microsoft.com/en-us/media/log... https://learn.microsoft.com/en-us/media/logos/logo_copilot.svg — 200 — 2.9 KiB — 32 ms — h2https://learn.microsoft.com/en-us/media/learn/instructor-led-badge.svglearn.microsoft.com/en-us/media/lea... https://learn.microsoft.com/en-us/media/learn/instructor-led-badge.svg — 200 — 5.9 KiB — 22 ms — h2https://learn.microsoft.com/en-us/training/achievements/generic-badge.svglearn.microsoft.com/en-us/training/... https://learn.microsoft.com/en-us/training/achievements/generic-badge.svg — 200 — 5.8 KiB — 27 ms — 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 504ms · 561KB · $7/mo
learn.microsoft.com
Other
Optional
Execution 173ms
Transfer 524 KB
Unused 69%
Monthly Cost $2/mo
Unattributable
Other
Optional
Execution 127ms
Transfer 0 KB
Monthly Cost $2/mo
learn.microsoft.com
Other
Optional
Execution 126ms
Transfer 10 KB
Monthly Cost $2/mo
learn.microsoft.com
Other
Optional
Execution 79ms
Transfer 27 KB
Monthly Cost $1/mo

100% 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

69% of learn.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

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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