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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
76
GRADE
C
FIX
4
REVIEW
3
PASS
8
INFO
2

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

Mobile Desktop
44
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.

6.40 s

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

12.25 s

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

221 ms

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

0.233

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

6.40 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.

12.88 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
17
8 PASS 3 REVIEW 4 FIX
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 (1.9 MiB of 1.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2269ms total JS execution
FIX
2269ms total JS execution
Warning::
https://learn.microsoft.com/static/assets/0.4.0339...: 765ms CPU time
Warning::
https://learn.microsoft.com/akam/13/488d17fd: 506ms CPU time
Warning::
https://learn.microsoft.com/en-us/: 459ms CPU time
Warning::
Unattributable: 424ms CPU time
Info::
https://js.monitor.azure.com/scripts/c/ms.jsll-4.m...: 116ms CPU time
Warning::
Third-party scripts: 2269ms (100% of total)

Main Thread Breakdown

Script Evaluation 40% Other 21% Style & Layout 20% Script Parsing & Compilation 13%
ScriptTotalScriptingParse/CompileParty
https://learn.microsoft.com/static/assets/0.4.03396.7743-19995e1d/scripts/en-us/index-docs.js765ms348ms260ms3rd
https://learn.microsoft.com/akam/13/488d17fd506ms464ms16ms3rd
https://learn.microsoft.com/en-us/459ms25ms2ms3rd
Unattributable424ms14ms0ms3rd
https://js.monitor.azure.com/scripts/c/ms.jsll-4.min.js116ms78ms22ms3rd
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
38 resources · 1.9 MB · 420 KB savings available
FIX
38 resources · 1.9 MB · 420 KB savings available
Warning::
Page weight 971 KB over 1MB target
Got: 1.9 MB Expected: ≤ 1 MB
Info::
~420 KB of savings available
Warning::
37 third-party resources (100% of weight)
Info::
2 resources over 200KB
38 resources · 1.9 MiB · 37 third-party 970.7 KiB over 1MB target
Font 54% · 1.0 MiB
JavaScript 33% · 664.1 KiB
Image 6% · 126.9 KiB
CSS 3% · 68.7 KiB
Other 2% · 32.1 KiB
Document 1% · 28.3 KiB

~419.9 KiB of savings available

Remove unused JavaScript: 419.9 KiB
C
Page Weight Budget
Action
1.9 MB transferred, 38 requests
REVIEW
1.9 MB transferred, 38 requests
Info::
Page weighs 4.6 MB (1.9 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::
38 HTTP requests
Info::
Estimated 0.41 g CO2 per page load
1.9 MB / 2.4 MB budget
1.9 MB transferred
38 requests
0.41 g CO2 per page load
Fonts 1.0 MiB 54%
JavaScript 664.1 KiB 33%
Images 124.5 KiB 6%
CSS 68.7 KiB 3%
HTML 27.5 KiB 1%
Other 17.0 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

B
Image Optimization
11 images, 0 KB saveable
REVIEW
11 images, 0 KB saveable
Info::
All images are well-optimized
11 images 124 KB
0 oversized -0 KB
8 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
2 fonts (1075 KB)
PASS
2 fonts (1075 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

1075 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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 6.4 s LCP 12.2 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 — 98 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 — 114 ms — font-display: swap
docons.19995e1.7a2385d0... woff2 swap
Size 24 KB
Load time 98 ms
Start 797 ms
Risk FOUT — text flashes from fallback to web font
SegoeUI-VF.ttf ttf swap
Size 1050 KB
Load time 114 ms
Start 800 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+
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
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
38 requests over 2954ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 6.4 s LCP 12.2 shttps://www.technet.com// https://www.technet.com/ — 301 — 479 B — 251 ms — h2https://learn.microsoft.com/learn.microsoft.com/ https://learn.microsoft.com/ — 302 — 1.8 KiB — 106 ms — h2https://learn.microsoft.com/en-us/learn.microsoft.com/en-us/ https://learn.microsoft.com/en-us/ — 200 — 27.5 KiB — 59 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 — 27 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 — 70 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 — 55 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 — 68 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 — 68 ms — h2https://learn.microsoft.com/akam/13/488d17fdlearn.microsoft.com/akam/13/488d17f... https://learn.microsoft.com/akam/13/488d17fd — 200 — 9.5 KiB — 18 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 — 21 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 — 37 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 — 125 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 — 123 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 — 125 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 — 125 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 — 125 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 — 119 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 — 98 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 — 114 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 — 41 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 — 24 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 — 34 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 — 81 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 — 83 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 — 37 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 — 42 ms — h2https://learn.microsoft.com/en-us/media/home-and-directory/icon-azure-cloud.svglearn.microsoft.com/en-us/media/hom... https://learn.microsoft.com/en-us/media/home-and-directory/icon-azure-cloud.svg — 200 — 37.3 KiB — 50 ms — h2
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 6.4 s LCP 12.2 shttps://www.technet.com// https://www.technet.com/ — 301 — 479 B — 251 ms — h2https://learn.microsoft.com/learn.microsoft.com/ https://learn.microsoft.com/ — 302 — 1.8 KiB — 106 ms — h2https://learn.microsoft.com/en-us/learn.microsoft.com/en-us/ https://learn.microsoft.com/en-us/ — 200 — 27.5 KiB — 59 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 — 27 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 — 70 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 — 55 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 — 68 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 — 68 ms — h2https://learn.microsoft.com/akam/13/488d17fdlearn.microsoft.com/akam/13/488d17f... https://learn.microsoft.com/akam/13/488d17fd — 200 — 9.5 KiB — 18 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 — 21 ms — h2https://learn.microsoft.com/en-us/feature-rollout.jsonlearn.microsoft.com/en-us/feature-r... 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https://learn.microsoft.com/media/learn/instructor-led-badge.svg — 302 — 1.8 KiB — 125 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 — 125 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 — 119 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 — 98 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 — 114 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 — 41 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 — 24 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 — 34 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 — 81 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 — 83 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 — 37 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 — 42 ms — h2https://learn.microsoft.com/en-us/media/home-and-directory/icon-azure-cloud.svglearn.microsoft.com/en-us/media/hom... https://learn.microsoft.com/en-us/media/home-and-directory/icon-azure-cloud.svg — 200 — 37.3 KiB — 50 ms — h2https://learn.microsoft.com/favicon.icolearn.microsoft.com/favicon.ico https://learn.microsoft.com/favicon.ico — 200 — 2.4 KiB — 19 ms — h2https://c1.microsoft.com/c.gif?DI=4050&did=1&t=c1.microsoft.com/c.gif?DI=4050&did=... https://c1.microsoft.com/c.gif?DI=4050&did=1&t= — 302 — 535 B — 53 ms — h2https://c.bing.com/c.gif?DI=4050&did=1&t=&ctsa=mr&CtsSyncId=412EE935CC4D40E1BFE293345018A138&RedC=c1.microsoft.com&MXFR=21211AD476FF63FA17A90D9772FF65DEc.bing.com/c.gif?DI=4050&did=1&t=&c... https://c.bing.com/c.gif?DI=4050&did=1&t=&ctsa=mr&CtsSyncId=412EE935CC4D40E1BFE293345018A138&RedC=c1.microsoft.com&MXFR=21211AD476FF63FA17A90D9772FF65DE — 302 — 876 B — 47 ms — h2https://c1.microsoft.com/c.gif?DI=4050&did=1&t=&ctsa=mr&CtsSyncId=412EE935CC4D40E1BFE293345018A138&MUID=21211AD476FF63FA17A90D9772FF65DEc1.microsoft.com/c.gif?DI=4050&did=... https://c1.microsoft.com/c.gif?DI=4050&did=1&t=&ctsa=mr&CtsSyncId=412EE935CC4D40E1BFE293345018A138&MUID=21211AD476FF63FA17A90D9772FF65DE — 200 — 837 B — 32 ms — h2https://learn.microsoft.com/akam/13/pixel_488d17fdlearn.microsoft.com/akam/13/pixel_4... https://learn.microsoft.com/akam/13/pixel_488d17fd — 200 — 858 B — 14 ms — h2https://browser.events.data.microsoft.com/OneCollector/1.0/?cors=true&content-type=application/x-json-stream&w=0browser.events.data.microsoft.com/O... https://browser.events.data.microsoft.com/OneCollector/1.0/?cors=true&content-type=application/x-json-stream&w=0 — 200 — 0 B — 19 ms — h2https://browser.events.data.microsoft.com/OneCollector/1.0/?cors=true&content-type=application/x-json-stream&w=0browser.events.data.microsoft.com/O... https://browser.events.data.microsoft.com/OneCollector/1.0/?cors=true&content-type=application/x-json-stream&w=0 — 200 — 762 B — 123 ms — h2https://browser.events.data.microsoft.com/OneCollector/1.0/?cors=true&content-type=application/x-json-stream&w=0browser.events.data.microsoft.com/O... https://browser.events.data.microsoft.com/OneCollector/1.0/?cors=true&content-type=application/x-json-stream&w=0 — 200 — 234 B — 56 ms — h2
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 2269ms · 636KB · $30/mo
learn.microsoft.com
Other
Costly
Execution 765ms
Transfer 524 KB
Unused 69%
Monthly Cost $10/mo
learn.microsoft.com
Other
Costly
Execution 506ms
Transfer 10 KB
Monthly Cost $7/mo
learn.microsoft.com
Other
Costly
Execution 459ms
Transfer 27 KB
Monthly Cost $6/mo
Unattributable
Other
Costly
Execution 424ms
Transfer 0 KB
Monthly Cost $6/mo
js.monitor.azure.com
Other
Optional
Execution 116ms
Transfer 75 KB
Unused 40%
Monthly Cost $2/mo

These scripts may cost more than they're worth

  • learn.microsoft.com adds 765ms and costs ~$10/month
  • learn.microsoft.com adds 506ms and costs ~$7/month
  • learn.microsoft.com adds 459ms and costs ~$6/month
  • Unattributable adds 424ms and costs ~$6/month

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

learn.microsoft.com takes 765ms 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

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

learn.microsoft.com takes 506ms 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

learn.microsoft.com takes 459ms 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 424ms 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

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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