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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
82
GRADE
B
FIX
4
REVIEW
3
PASS
8
INFO
2

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

Mobile Desktop
25
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.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
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.

6.61 s

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

7.99 s

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

563 ms

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

0.407

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

7.22 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.

10.04 s

Page Load Progression

410 ms
820 ms
1.2 s
1.6 s
2.0 s
2.5 s
2.9 s
3.3 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 (1.4 MiB of 1.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2424ms total JS execution
FIX
2424ms total JS execution
Warning::
Unattributable: 460ms CPU time
Warning::
https://dotnet.microsoft.com/en-us/apps/aspnet: 445ms CPU time
Warning::
https://dotnet.microsoft.com/static/js/main.min.js...: 390ms CPU time
Warning::
https://uhf.microsoft.com/statics/20260421.16.02/j...: 291ms CPU time
Warning::
https://js.monitor.azure.com/scripts/b/ai.3.min.js: 268ms CPU time
Warning::
Third-party scripts: 2424ms (100% of total)

Main Thread Breakdown

Script Evaluation 48% Other 22% Style & Layout 13% Script Parsing & Compilation 7% Parse HTML & CSS 7% Rendering 4%
ScriptTotalScriptingParse/CompileParty
Unattributable460ms33ms0ms3rd
https://dotnet.microsoft.com/en-us/apps/aspnet445ms24ms5ms3rd
https://dotnet.microsoft.com/static/js/main.min.js?v=6VTgZMA9byKuNVNnUSMA8SzBB9MuqRoJlNVCooNxlu4390ms333ms8ms3rd
https://uhf.microsoft.com/statics/20260421.16.02/js/index-Cifsy-6O.js291ms189ms1ms3rd
https://js.monitor.azure.com/scripts/b/ai.3.min.js268ms229ms29ms3rd
https://dotnet.microsoft.com/static/js/cookie-consent.min.js?v=cPwRYK_KXC_97Lbz_R3EFgGKqN3we23dMoCDF5iaWgQ219ms214ms1ms3rd
https://dotnet.microsoft.com/static/js/general.min.js?v=crDs_3gNR-ZIa2Eev4LJJO8V0OuAtjVqGkIfRK0oSy8145ms100ms40ms3rd
https://wcpstatic.microsoft.com/mscc/lib/v2/wcp-consent.js78ms22ms54ms3rd
https://js.monitor.azure.com/scripts/c/ms.analytics-web-4.min.js70ms38ms30ms3rd
https://uhf.microsoft.com/statics/20260421.16.02/css/style-BpAANDpw.css58ms0ms0ms3rd
D
Page Weight Inventory
Action
38 resources · 1.4 MB · 101 KB savings available
FIX
38 resources · 1.4 MB · 101 KB savings available
Warning::
Page weight 427 KB over 1MB target
Got: 1.4 MB Expected: ≤ 1 MB
Info::
~101 KB of savings available
Warning::
37 third-party resources (100% of weight)
Info::
2 resources over 200KB
38 resources · 1.4 MiB · 37 third-party 427.0 KiB over 1MB target
JavaScript 36% · 525.2 KiB
Font 26% · 370.4 KiB
CSS 20% · 285.1 KiB
Image 12% · 177.7 KiB
Document 6% · 90.2 KiB
Other 0% · 2.4 KiB

~101.1 KiB of savings available

Remove unused JavaScript: 101.1 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

B
Page Weight Budget
1.4 MB transferred, 38 requests
REVIEW
1.4 MB transferred, 38 requests
Info::
Page weighs 2.3 MB (1.4 MB transferred)
Warning::
JavaScript is 525 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 525 KB
Info::
Fonts are 332 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 332 KB
Info::
CSS is 285 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 285 KB
Info::
38 HTTP requests
Info::
Estimated 0.30 g CO2 per page load
1.4 MB / 2.4 MB budget
1.4 MB transferred
38 requests
0.30 g CO2 per page load
JavaScript 525.2 KiB 36%
Fonts 331.7 KiB 23%
CSS 285.1 KiB 20%
Other 201.9 KiB 14%
HTML 89.8 KiB 6%
Images 15.1 KiB 1%
Other 2.1 KiB 0%
Other 166 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Under budget

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

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

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

Source: web.dev

B
JS Bundles
12 scripts, 101 KB unused
REVIEW
12 scripts, 101 KB unused
Warning::
https://dotnet.microsoft.com/static/js/general.min...: 51 KB unused (74%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://js.monitor.azure.com/scripts/b/ai.3.min.js: 28 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://js.monitor.azure.com/scripts/c/ms.analytic...: 22 KB unused (37%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 101 KB
101 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://dotnet.microsoft.com/static/js/general.min.js?v=crDs_3gNR-ZIa2Eev4LJJO8V0OuAtjVqGkIfRK0oSy870 KB51 KB (74%)✓3rd
https://js.monitor.azure.com/scripts/b/ai.3.min.js67 KB28 KB (42%)✓3rd
https://js.monitor.azure.com/scripts/c/ms.analytics-web-4.min.js60 KB22 KB (37%)✓3rd
https://dotnet.microsoft.com/static/js/cookie-consent.min.js?v=cPwRYK_KXC_97Lbz_R3EFgGKqN3we23dMoCDF5iaWgQ4 KB—✓3rd
https://dotnet.microsoft.com/static/js/culture-selector.min.js?v=GE6nshQOS7i_CIDhmaS7j-Dhs9UjMawW6Ff-bpkns2E2 KB—✓3rd
https://uhf.microsoft.com/statics/20260421.16.02/js/entry.js2 KB—✓3rd
https://dotnet.microsoft.com/static/js/theme-toggle.min.js?v=ClfBS9u6I4w4prx1z3mrn-N4g7EmhBStfKxrMi9QxQ42 KB—✓3rd
https://dotnet.microsoft.com/static/js/main.min.js?v=6VTgZMA9byKuNVNnUSMA8SzBB9MuqRoJlNVCooNxlu413 KB—✓3rd
https://wcpstatic.microsoft.com/mscc/lib/v2/wcp-consent.js274 KB—✓3rd
https://dotnet.microsoft.com/static/js/cda-tracker.min.js?v=SyYaSyIMxBKYbravFr4rQISs39K6Wu_jyNMP-TEkBgE1 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

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
Image Optimization
2 images, 0 KB saveable
PASS
2 images, 0 KB saveable
Warning::
https://uhf.microsoft.com/images/microsoft/RE1Mu3b... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
2 images 15 KB
0 oversized -0 KB
2 legacy format
1 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

A+
Font Loading
11 fonts (370 KB)
PASS
11 fonts (370 KB)
Info::
11 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

11

370 KB total

Render-blocking

0

of 11

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 FCP 6.6 s LCP 8.0 shttps://dotnet.microsoft.com/static/fonts/space-grotesk-v12-latin-700.woffspace-grotesk-v12-latin... https://dotnet.microsoft.com/static/fonts/space-grotesk-v12-latin-700.woff — 14.7 KiB — 657 ms — font-display: swaphttps://dotnet.microsoft.com/static/fonts/space-grotesk-v12-latin-700.woff2space-grotesk-v12-latin... https://dotnet.microsoft.com/static/fonts/space-grotesk-v12-latin-700.woff2 — 11.7 KiB — 638 ms — font-display: swaphttps://dotnet.microsoft.com/static/fonts/open-sans-v34-latin-regular.woffopen-sans-v34-latin-reg... https://dotnet.microsoft.com/static/fonts/open-sans-v34-latin-regular.woff — 20.8 KiB — 804 ms — font-display: swaphttps://dotnet.microsoft.com/static/fonts/open-sans-v34-latin-regular.woff2open-sans-v34-latin-reg... https://dotnet.microsoft.com/static/fonts/open-sans-v34-latin-regular.woff2 — 16.9 KiB — 623 ms — font-display: swaphttps://dotnet.microsoft.com/static/fonts/open-sans-v34-latin-600.woffopen-sans-v34-latin-600... https://dotnet.microsoft.com/static/fonts/open-sans-v34-latin-600.woff — 20.8 KiB — 760 ms — font-display: swaphttps://dotnet.microsoft.com/static/fonts/open-sans-v34-latin-600.woff2open-sans-v34-latin-600... https://dotnet.microsoft.com/static/fonts/open-sans-v34-latin-600.woff2 — 16.9 KiB — 617 ms — font-display: swaphttps://dotnet.microsoft.com/static/fonts/open-sans-v34-latin-700.woffopen-sans-v34-latin-700... https://dotnet.microsoft.com/static/fonts/open-sans-v34-latin-700.woff — 20.3 KiB — 731 ms — font-display: swaphttps://dotnet.microsoft.com/static/fonts/open-sans-v34-latin-700.woff2open-sans-v34-latin-700... https://dotnet.microsoft.com/static/fonts/open-sans-v34-latin-700.woff2 — 16.5 KiB — 650 ms — font-display: swaphttps://dotnet.microsoft.com/static/fonts/dotnetmdl2-icons-061622.woffdotnetmdl2-icons-061622... https://dotnet.microsoft.com/static/fonts/dotnetmdl2-icons-061622.woff — 14.5 KiB — 164 ms — font-display: swaphttps://dotnet.microsoft.com/static/fonts/dotnetmdl2-icons-061622.ttfdotnetmdl2-icons-061622... https://dotnet.microsoft.com/static/fonts/dotnetmdl2-icons-061622.ttf — 24.3 KiB — 158 ms — font-display: swapdata:font/woff;base64,d09GRgABAAAAAwPAAA4AAAAGHZAAA7MzAAAAAAAAAAAAAAAAAAAAAAAAAABPUy8yAAABRAAAAEgAA…woff;base64,d09GRgABAAA... data:font/woff;base64,d09GRgABAAAAAwPAAA4AAAAGHZAAA7MzAAAAAAAAAAAAAAAAAAAAAAAAAABPUy8yAAABRAAAAEgAA… — 192.9 KiB — 68 ms — font-display: swap
space-grotesk-v12-latin... woff swap
Size 15 KB
Load time 657 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
space-grotesk-v12-latin... woff2 swap
Size 12 KB
Load time 638 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
open-sans-v34-latin-reg... woff swap
Size 21 KB
Load time 804 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
open-sans-v34-latin-reg... woff2 swap
Size 17 KB
Load time 623 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
open-sans-v34-latin-600... woff swap
Size 21 KB
Load time 760 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
open-sans-v34-latin-600... woff2 swap
Size 17 KB
Load time 617 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
open-sans-v34-latin-700... woff swap
Size 20 KB
Load time 731 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
open-sans-v34-latin-700... woff2 swap
Size 17 KB
Load time 650 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
dotnetmdl2-icons-061622... woff swap
Size 15 KB
Load time 164 ms
Start 2.6 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
dotnetmdl2-icons-061622... ttf swap
Size 24 KB
Load time 158 ms
Start 2.6 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
woff;base64,d09GRgABAAA... woff swap
Size 193 KB
Load time 68 ms
Start 2.9 s
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 ~189 KB and ~378 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
13 hints, 0 missing preconnects
PASS
13 hints, 0 missing preconnects
Info::
Page uses 13 resource hint(s)

Current Resource Hints

preconnect
1
preload
8
dns-prefetch
2
prefetch
2

13 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
38 requests over 6370ms
INFO
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 FCP 6.6 s LCP 8.0 shttps://asp.net// https://asp.net/ — 301 — 124 B — 260 ms — h2https://www.asp.net/www.asp.net/ https://www.asp.net/ — 302 — 434 B — 672 ms — h2https://dotnet.microsoft.com/en-us/apps/aspnetdotnet.microsoft.com/en-us/apps/asp... https://dotnet.microsoft.com/en-us/apps/aspnet — 200 — 89.8 KiB — 946 ms — h2https://dotnet.microsoft.com/static/fonts/space-grotesk-v12-latin-700.woffdotnet.microsoft.com/static/fonts/s... https://dotnet.microsoft.com/static/fonts/space-grotesk-v12-latin-700.woff — 200 — 14.7 KiB — 657 ms — h2https://dotnet.microsoft.com/static/fonts/space-grotesk-v12-latin-700.woff2dotnet.microsoft.com/static/fonts/s... https://dotnet.microsoft.com/static/fonts/space-grotesk-v12-latin-700.woff2 — 200 — 11.7 KiB — 638 ms — h2https://dotnet.microsoft.com/static/fonts/open-sans-v34-latin-regular.woffdotnet.microsoft.com/static/fonts/o... https://dotnet.microsoft.com/static/fonts/open-sans-v34-latin-regular.woff — 200 — 20.8 KiB — 804 ms — h2https://dotnet.microsoft.com/static/fonts/open-sans-v34-latin-regular.woff2dotnet.microsoft.com/static/fonts/o... https://dotnet.microsoft.com/static/fonts/open-sans-v34-latin-regular.woff2 — 200 — 16.9 KiB — 623 ms — h2https://dotnet.microsoft.com/static/fonts/open-sans-v34-latin-600.woffdotnet.microsoft.com/static/fonts/o... https://dotnet.microsoft.com/static/fonts/open-sans-v34-latin-600.woff — 200 — 20.8 KiB — 760 ms — h2https://dotnet.microsoft.com/static/fonts/open-sans-v34-latin-600.woff2dotnet.microsoft.com/static/fonts/o... https://dotnet.microsoft.com/static/fonts/open-sans-v34-latin-600.woff2 — 200 — 16.9 KiB — 617 ms — h2https://dotnet.microsoft.com/static/fonts/open-sans-v34-latin-700.woffdotnet.microsoft.com/static/fonts/o... https://dotnet.microsoft.com/static/fonts/open-sans-v34-latin-700.woff — 200 — 20.3 KiB — 731 ms — h2https://dotnet.microsoft.com/static/fonts/open-sans-v34-latin-700.woff2dotnet.microsoft.com/static/fonts/o... https://dotnet.microsoft.com/static/fonts/open-sans-v34-latin-700.woff2 — 200 — 16.5 KiB — 650 ms — h2https://uhf.microsoft.com/statics/20260421.16.02/css/style-BpAANDpw.cssuhf.microsoft.com/statics/20260421.... https://uhf.microsoft.com/statics/20260421.16.02/css/style-BpAANDpw.css — 200 — 226.0 KiB — 26 ms — h2https://dotnet.microsoft.com/static/css/bootstrap-custom.min.css?v=IftXf1dte1yxkBhZUaoYiwhE96WxlRnUdGyBghFOM70dotnet.microsoft.com/static/css/boo... https://dotnet.microsoft.com/static/css/bootstrap-custom.min.css?v=IftXf1dte1yxkBhZUaoYiwhE96WxlRnUdGyBghFOM70 — 200 — 59.1 KiB — 922 ms — h2https://js.monitor.azure.com/scripts/c/ms.analytics-web-4.min.jsjs.monitor.azure.com/scripts/c/ms.a... https://js.monitor.azure.com/scripts/c/ms.analytics-web-4.min.js — 200 — 59.9 KiB — 51 ms — h2https://dotnet.microsoft.com/static/js/cookie-consent.min.js?v=cPwRYK_KXC_97Lbz_R3EFgGKqN3we23dMoCDF5iaWgQdotnet.microsoft.com/static/js/cook... https://dotnet.microsoft.com/static/js/cookie-consent.min.js?v=cPwRYK_KXC_97Lbz_R3EFgGKqN3we23dMoCDF5iaWgQ — 200 — 3.5 KiB — 585 ms — h2https://uhf.microsoft.com/images/microsoft/RE1Mu3b.pnguhf.microsoft.com/images/microsoft/... https://uhf.microsoft.com/images/microsoft/RE1Mu3b.png — 200 — 4.2 KiB — 5 ms — h2https://dotnet.microsoft.com/static/js/culture-selector.min.js?v=GE6nshQOS7i_CIDhmaS7j-Dhs9UjMawW6Ff-bpkns2Edotnet.microsoft.com/static/js/cult... https://dotnet.microsoft.com/static/js/culture-selector.min.js?v=GE6nshQOS7i_CIDhmaS7j-Dhs9UjMawW6Ff-bpkns2E — 200 — 1.6 KiB — 163 ms — h2https://uhf.microsoft.com/statics/20260421.16.02/js/entry.jsuhf.microsoft.com/statics/20260421.... https://uhf.microsoft.com/statics/20260421.16.02/js/entry.js — 200 — 1.8 KiB — 9 ms — h2https://dotnet.microsoft.com/static/js/theme-toggle.min.js?v=ClfBS9u6I4w4prx1z3mrn-N4g7EmhBStfKxrMi9QxQ4dotnet.microsoft.com/static/js/them... https://dotnet.microsoft.com/static/js/theme-toggle.min.js?v=ClfBS9u6I4w4prx1z3mrn-N4g7EmhBStfKxrMi9QxQ4 — 200 — 2.2 KiB — 632 ms — h2https://dotnet.microsoft.com/static/js/general.min.js?v=crDs_3gNR-ZIa2Eev4LJJO8V0OuAtjVqGkIfRK0oSy8dotnet.microsoft.com/static/js/gene... https://dotnet.microsoft.com/static/js/general.min.js?v=crDs_3gNR-ZIa2Eev4LJJO8V0OuAtjVqGkIfRK0oSy8 — 200 — 69.8 KiB — 167 ms — h2https://dotnet.microsoft.com/static/js/main.min.js?v=6VTgZMA9byKuNVNnUSMA8SzBB9MuqRoJlNVCooNxlu4dotnet.microsoft.com/static/js/main... https://dotnet.microsoft.com/static/js/main.min.js?v=6VTgZMA9byKuNVNnUSMA8SzBB9MuqRoJlNVCooNxlu4 — 200 — 12.6 KiB — 159 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 — 273.7 KiB — 273 ms — h2https://dotnet.microsoft.com/static/js/cda-tracker.min.js?v=SyYaSyIMxBKYbravFr4rQISs39K6Wu_jyNMP-TEkBgEdotnet.microsoft.com/static/js/cda-... https://dotnet.microsoft.com/static/js/cda-tracker.min.js?v=SyYaSyIMxBKYbravFr4rQISs39K6Wu_jyNMP-TEkBgE — 200 — 1.2 KiB — 163 ms — h2https://dotnet.microsoft.com/static/js/footer.min.js?v=RVslb4HZMiuSbGsDzcAsIhvWLZgw2HmQR-fsPOHkfMQdotnet.microsoft.com/static/js/foot... https://dotnet.microsoft.com/static/js/footer.min.js?v=RVslb4HZMiuSbGsDzcAsIhvWLZgw2HmQR-fsPOHkfMQ — 200 — 936 B — 163 ms — h2https://dotnet.microsoft.com/static/fonts/dotnetmdl2-icons-061622.woffdotnet.microsoft.com/static/fonts/d... https://dotnet.microsoft.com/static/fonts/dotnetmdl2-icons-061622.woff — 200 — 14.5 KiB — 164 ms — h2https://dotnet.microsoft.com/static/fonts/dotnetmdl2-icons-061622.ttfdotnet.microsoft.com/static/fonts/d... https://dotnet.microsoft.com/static/fonts/dotnetmdl2-icons-061622.ttf — 200 — 24.3 KiB — 158 ms — 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h2https://dotnet.microsoft.com/static/js/cookie-consent.min.js?v=cPwRYK_KXC_97Lbz_R3EFgGKqN3we23dMoCDF5iaWgQdotnet.microsoft.com/static/js/cook... https://dotnet.microsoft.com/static/js/cookie-consent.min.js?v=cPwRYK_KXC_97Lbz_R3EFgGKqN3we23dMoCDF5iaWgQ — 200 — 3.5 KiB — 585 ms — h2https://uhf.microsoft.com/images/microsoft/RE1Mu3b.pnguhf.microsoft.com/images/microsoft/... https://uhf.microsoft.com/images/microsoft/RE1Mu3b.png — 200 — 4.2 KiB — 5 ms — h2https://dotnet.microsoft.com/static/js/culture-selector.min.js?v=GE6nshQOS7i_CIDhmaS7j-Dhs9UjMawW6Ff-bpkns2Edotnet.microsoft.com/static/js/cult... https://dotnet.microsoft.com/static/js/culture-selector.min.js?v=GE6nshQOS7i_CIDhmaS7j-Dhs9UjMawW6Ff-bpkns2E — 200 — 1.6 KiB — 163 ms — h2https://uhf.microsoft.com/statics/20260421.16.02/js/entry.jsuhf.microsoft.com/statics/20260421.... https://uhf.microsoft.com/statics/20260421.16.02/js/entry.js — 200 — 1.8 KiB — 9 ms — 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— 166 B — 259 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 — -1 — 0 B — 0 ms — https://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 — 763 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 2424ms · 833KB · $32/mo
Unattributable
Other
Costly
Execution 460ms
Transfer 0 KB
Monthly Cost $6/mo
dotnet.microsoft.com
Other
Costly
Execution 445ms
Transfer 90 KB
Monthly Cost $6/mo
dotnet.microsoft.com
Other
Costly
Execution 390ms
Transfer 13 KB
Monthly Cost $5/mo
uhf.microsoft.com
Other
Costly
Execution 291ms
Transfer 31 KB
Monthly Cost $4/mo
js.monitor.azure.com
Other
Costly
Execution 268ms
Transfer 67 KB
Unused 42%
Monthly Cost $4/mo
dotnet.microsoft.com
Other
Costly
Execution 219ms
Transfer 4 KB
Monthly Cost $3/mo
dotnet.microsoft.com
Other
Optional
Execution 145ms
Transfer 70 KB
Unused 74%
Monthly Cost $2/mo
wcpstatic.microsoft.com
Other
Optional
Execution 78ms
Transfer 274 KB
Monthly Cost $1/mo
js.monitor.azure.com
Other
Optional
Execution 70ms
Transfer 60 KB
Unused 37%
Monthly Cost $1/mo
uhf.microsoft.com
Other
Optional
Execution 58ms
Transfer 226 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 460ms and costs ~$6/month
  • dotnet.microsoft.com adds 445ms and costs ~$6/month
  • dotnet.microsoft.com adds 390ms and costs ~$5/month
  • uhf.microsoft.com adds 291ms and costs ~$4/month
  • js.monitor.azure.com adds 268ms and costs ~$4/month
  • dotnet.microsoft.com adds 219ms and costs ~$3/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

Unattributable takes 460ms 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

dotnet.microsoft.com takes 445ms 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

dotnet.microsoft.com takes 390ms 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

uhf.microsoft.com takes 291ms 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

js.monitor.azure.com takes 268ms 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

dotnet.microsoft.com takes 219ms 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

74% of dotnet.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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