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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
74
GRADE
C
FIX
5
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
36
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
96
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
77
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.

5.00 s

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

12.75 s

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

1.28 s

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

0.000

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

6.03 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.

14.39 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
7 PASS 3 REVIEW 5 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 (1.8 MiB of 1.8 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
4295ms total JS execution
FIX
4295ms total JS execution
Warning::
https://res.cdn.office.net/officehub/bundles/unaut...: 935ms CPU time
Warning::
https://res.cdn.office.net/officehub/bundles/unaut...: 721ms CPU time
Warning::
Unattributable: 611ms CPU time
Warning::
https://res.cdn.office.net/admincenter/admin-main/...: 445ms CPU time
Warning::
https://res.cdn.office.net/officehub/bundles/unaut...: 359ms CPU time
Warning::
Third-party scripts: 4295ms (100% of total)

Main Thread Breakdown

Script Evaluation 53% Other 20% Style & Layout 13% Script Parsing & Compilation 10%
ScriptTotalScriptingParse/CompileParty
https://res.cdn.office.net/officehub/bundles/unauth-vendor-f0ab3fa70e.js935ms446ms43ms3rd
https://res.cdn.office.net/officehub/bundles/unauth-936aa5c11c.js721ms311ms25ms3rd
Unattributable611ms8ms0ms3rd
https://res.cdn.office.net/admincenter/admin-main/2026.4.2.8/floodgate.en.bundle.js445ms287ms149ms3rd
https://res.cdn.office.net/officehub/bundles/unauth-odc-scripts-6378fb4b6f.js359ms226ms118ms3rd
https://www.microsoft.com/onerfstatics/marketingsites-wcus-prod/shell/_scrf/js/themes=default/54-af9f9f/fb-2be034/21-f9d187/b0-50721e/d8-97d509/40-0bd7f9/ea-f1669e/9d-c6ea39/62-a72447/3e-a4ee50/7c-0bd6a1/60-37309a/db-bc0148/dc-7e9864/6d-c07ea1/6f-dafe8c/f6-aa5278/e6-5f3533/6d-1e7ed0/b7-cadaa7/62-2741f0/ca-40b7b0/4e-ee3a55/3e-f5c39b/c3-6454d7/f9-7592d3/d0-e64f3e/92-10345d/79-499886/7e-cda2d3/e7-1fe854/66-9d711a/38-b93a9e/de-884374/1f-100dea/33-abe4df/8f-61bee0?ver=2.0&_cf=02242021_3231&iife=1231ms190ms14ms3rd
https://www.office.com/221ms68ms14ms3rd
https://mem.gfx.ms/meversion?partner=office&market=en-us&uhf=1219ms199ms4ms3rd
https://scripts.clarity.ms/0.8.59/clarity.js218ms199ms9ms3rd
https://mem.gfx.ms/scripts/me/MeControl/10.25136.1/en-US/meBoot.min.js152ms99ms50ms3rd

Showing top 10 of 12 scripts

D
JS Bundles
Action
17 scripts, 432 KB unused
FIX
17 scripts, 432 KB unused
Warning::
https://res.cdn.office.net/admincenter/admin-main/...: 290 KB unused (88%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://res.cdn.office.net/officehub/bundles/unaut...: 94 KB unused (51%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://res.cdn.office.net/officehub/bundles/unaut...: 24 KB unused (38%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.microsoft.com/onerfstatics/marketingsi...: 23 KB unused (64%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 432 KB
432 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://res.cdn.office.net/admincenter/admin-main/2026.4.2.8/floodgate.en.bundle.js332 KB290 KB (88%)✓3rd
https://res.cdn.office.net/officehub/bundles/unauth-odc-scripts-6378fb4b6f.js187 KB94 KB (51%)✓3rd
https://res.cdn.office.net/officehub/bundles/unauth-936aa5c11c.js64 KB24 KB (38%)✓3rd
https://www.microsoft.com/onerfstatics/marketingsites-wcus-prod/shell/_scrf/js/themes=default/54-af9f9f/fb-2be034/21-f9d187/b0-50721e/d8-97d509/40-0bd7f9/ea-f1669e/9d-c6ea39/62-a72447/3e-a4ee50/7c-0bd6a1/60-37309a/db-bc0148/dc-7e9864/6d-c07ea1/6f-dafe8c/f6-aa5278/e6-5f3533/6d-1e7ed0/b7-cadaa7/62-2741f0/ca-40b7b0/4e-ee3a55/3e-f5c39b/c3-6454d7/f9-7592d3/d0-e64f3e/92-10345d/79-499886/7e-cda2d3/e7-1fe854/66-9d711a/38-b93a9e/de-884374/1f-100dea/33-abe4df/8f-61bee0?ver=2.0&_cf=02242021_3231&iife=137 KB23 KB (64%)✓3rd
https://res.cdn.office.net/officehub/bundles/unauth-page-performance-fe909b4df2.js2 KB—✓3rd
https://res.cdn.office.net/officehub/bundles/otel-logger-39618b5914375db48ab3.js37 KB—✓3rd
https://res.cdn.office.net/officehub/bundles/unauth-vendor-f0ab3fa70e.js35 KB—✓3rd
https://res.cdn.office.net/officehub/bundles/unauth-mcm-faq-3ed592771b.js1 KB—✓3rd
https://res.cdn.office.net/officehub/bundles/microsoft-clarity-ff3e2df9ac.js2 KB—✓3rd
https://mem.gfx.ms/meversion?partner=office&market=en-us&uhf=110 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

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
65 resources · 1.8 MB · 432 KB savings available
FIX
65 resources · 1.8 MB · 432 KB savings available
Warning::
Page weight 816 KB over 1MB target
Got: 1.8 MB Expected: ≤ 1 MB
Info::
~432 KB of savings available
Warning::
64 third-party resources (100% of weight)
Info::
2 resources over 200KB
65 resources · 1.8 MiB · 64 third-party 816.2 KiB over 1MB target
JavaScript 47% · 856.9 KiB
Image 35% · 642.6 KiB
Font 9% · 165.7 KiB
CSS 6% · 117.7 KiB
Document 3% · 49.8 KiB
Other 0% · 7.5 KiB

~431.6 KiB of savings available

Remove unused JavaScript: 431.6 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.

C
Page Weight Budget
Action
1.8 MB transferred, 65 requests
REVIEW
1.8 MB transferred, 65 requests
Info::
Page weighs 4.6 MB (1.8 MB transferred)
Warning::
JavaScript is 857 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 857 KB
Info::
65 HTTP requests
Info::
Estimated 0.38 g CO2 per page load
1.8 MB / 2.4 MB budget
1.8 MB transferred
65 requests
0.38 g CO2 per page load
JavaScript 856.9 KiB 47%
Images 633.1 KiB 34%
Fonts 165.7 KiB 9%
CSS 117.7 KiB 6%
HTML 49.8 KiB 3%
Other 9.6 KiB 1%
Other 4.0 KiB 0%
Other 3.3 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

C
Image Optimization
Action
18 images, 0 KB saveable
REVIEW
18 images, 0 KB saveable
Warning::
https://res.cdn.office.net/officehub/images/conten... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://res.cdn.office.net/officehub/images/conten... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://res.cdn.office.net/officehub/images/conten... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://res.cdn.office.net/officehub/images/conten... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://uhf.microsoft.com/images/microsoft/RE1Mu3b... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://res.cdn.office.net/officehub/images/conten... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://res.cdn.office.net/officehub/images/conten... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://res.cdn.office.net/officehub/images/conten... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://res.cdn.office.net/officehub/images/conten... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://res.cdn.office.net/officehub/images/conten... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://res.cdn.office.net/officehub/images/conten... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://res.cdn.office.net/officehub/images/conten... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://res.cdn.office.net/officehub/images/conten... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://res.cdn.office.net/officehub/images/conten... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
18 images 633 KB
0 oversized -0 KB
17 legacy format
14 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

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

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

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

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

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

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

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

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

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

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

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

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

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

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
8 fonts (166 KB)
PASS
8 fonts (166 KB)
Info::
8 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

8

166 KB total

Render-blocking

0

of 8

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 5.0 s LCP 12.8 shttps://res.cdn.office.net/officehub/versionless/webfonts/segoeui_light.woff2segoeui_light.woff2 https://res.cdn.office.net/officehub/versionless/webfonts/segoeui_light.woff2 — 11.1 KiB — 63 ms — font-display: swaphttps://res.cdn.office.net/officehub/versionless/webfonts/segoeui_regular.woff2segoeui_regular.woff2 https://res.cdn.office.net/officehub/versionless/webfonts/segoeui_regular.woff2 — 11.6 KiB — 68 ms — font-display: swaphttps://res.cdn.office.net/officehub/versionless/webfonts/segoeui_semibold.woff2segoeui_semibold.woff2 https://res.cdn.office.net/officehub/versionless/webfonts/segoeui_semibold.woff2 — 11.9 KiB — 65 ms — font-display: swaphttps://res.cdn.office.net/officehub/versionless/webfonts/segoeui_semilight.woff2segoeui_semilight.woff2 https://res.cdn.office.net/officehub/versionless/webfonts/segoeui_semilight.woff2 — 12.7 KiB — 75 ms — font-display: swaphttps://c.s-microsoft.com/static/fonts/segoe-ui/west-european/normal/latest.woff2latest.woff2 https://c.s-microsoft.com/static/fonts/segoe-ui/west-european/normal/latest.woff2 — 33.5 KiB — 24 ms — font-display: swaphttps://www.microsoft.com/mwf/_h/v3.54/mwf.app/fonts/mwfmdl2-v3.54.woffmwfmdl2-v3.54.woff https://www.microsoft.com/mwf/_h/v3.54/mwf.app/fonts/mwfmdl2-v3.54.woff — 26.4 KiB — 82 ms — font-display: swaphttps://c.s-microsoft.com/static/fonts/segoe-ui/west-european/Bold/latest.woff2latest.woff2 https://c.s-microsoft.com/static/fonts/segoe-ui/west-european/Bold/latest.woff2 — 29.6 KiB — 18 ms — font-display: swaphttps://c.s-microsoft.com/static/fonts/segoe-ui/west-european/Semibold/latest.woff2latest.woff2 https://c.s-microsoft.com/static/fonts/segoe-ui/west-european/Semibold/latest.woff2 — 28.9 KiB — 20 ms — font-display: swap
segoeui_light.woff2 woff2 swap
Size 11 KB
Load time 63 ms
Start 211 ms
Risk FOUT — text flashes from fallback to web font
segoeui_regular.woff2 woff2 swap
Size 12 KB
Load time 68 ms
Start 212 ms
Risk FOUT — text flashes from fallback to web font
segoeui_semibold.woff2 woff2 swap
Size 12 KB
Load time 65 ms
Start 212 ms
Risk FOUT — text flashes from fallback to web font
segoeui_semilight.woff2 woff2 swap
Size 13 KB
Load time 75 ms
Start 212 ms
Risk FOUT — text flashes from fallback to web font
latest.woff2 woff2 swap
Size 33 KB
Load time 24 ms
Start 981 ms
Risk FOUT — text flashes from fallback to web font
mwfmdl2-v3.54.woff woff swap
Size 26 KB
Load time 82 ms
Start 982 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
latest.woff2 woff2 swap
Size 30 KB
Load time 18 ms
Start 982 ms
Risk FOUT — text flashes from fallback to web font
latest.woff2 woff2 swap
Size 29 KB
Load time 20 ms
Start 983 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)

Fixing the unchecked items could save ~8 KB and ~16 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
14 hints, 0 missing preconnects
PASS
14 hints, 0 missing preconnects
Info::
Page uses 14 resource hint(s)

Current Resource Hints

preconnect
—
preload
4
dns-prefetch
10
prefetch
—

14 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
65 requests over 3483ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 5.0 s LCP 12.8 shttps://office.com// https://office.com/ — 301 — 143 B — 145 ms — h2https://www.office.com/www.office.com/ https://www.office.com/ — 200 — 39.0 KiB — 68 ms — h2https://res.cdn.office.net/officehub/bundles/unauth-3a910e427c.cssres.cdn.office.net/officehub/bundle... https://res.cdn.office.net/officehub/bundles/unauth-3a910e427c.css — 200 — 82.3 KiB — 84 ms — h2https://res.cdn.office.net/officehub/bundles/sharedfontstyles-f7f2466ff5.cssres.cdn.office.net/officehub/bundle... https://res.cdn.office.net/officehub/bundles/sharedfontstyles-f7f2466ff5.css — 200 — 1.1 KiB — 56 ms — h2https://res.cdn.office.net/officehub/versionless/webfonts/segoeui_light.woff2res.cdn.office.net/officehub/versio... https://res.cdn.office.net/officehub/versionless/webfonts/segoeui_light.woff2 — 200 — 11.1 KiB — 63 ms — h2https://res.cdn.office.net/officehub/versionless/webfonts/segoeui_regular.woff2res.cdn.office.net/officehub/versio... https://res.cdn.office.net/officehub/versionless/webfonts/segoeui_regular.woff2 — 200 — 11.6 KiB — 68 ms — h2https://res.cdn.office.net/officehub/versionless/webfonts/segoeui_semibold.woff2res.cdn.office.net/officehub/versio... https://res.cdn.office.net/officehub/versionless/webfonts/segoeui_semibold.woff2 — 200 — 11.9 KiB — 65 ms — h2https://res.cdn.office.net/officehub/versionless/webfonts/segoeui_semilight.woff2res.cdn.office.net/officehub/versio... https://res.cdn.office.net/officehub/versionless/webfonts/segoeui_semilight.woff2 — 200 — 12.7 KiB — 75 ms — h2https://www.microsoft.com/onerfstatics/marketingsites-wcus-prod/west-european/shell/_scrf/css/themes=default.device=uplevel_web_pc/63-57d110/c9-be0100/a6-e969ef/43-9f2e7c/82-8b5456/a0-5d3913/4f-460e79/ae-f1ac0c?ver=2.0&_cf=02242021_3231www.microsoft.com/onerfstatics/mark... 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h2https://res.cdn.office.net/officehub/images/content/images/unauth-odc/office365-bc5244dd6e.pngres.cdn.office.net/officehub/images... https://res.cdn.office.net/officehub/images/content/images/unauth-odc/office365-bc5244dd6e.png — 200 — 201.8 KiB — 66 ms — h2https://res.cdn.office.net/officehub/images/content/images/unauth-mcm/hero-module1-7fefe20a7f.pngres.cdn.office.net/officehub/images... https://res.cdn.office.net/officehub/images/content/images/unauth-mcm/hero-module1-7fefe20a7f.png — 200 — 54.5 KiB — 34 ms — h2https://res.cdn.office.net/officehub/images/content/images/unauth-mcm/hero-module2-9b20271b1e.pngres.cdn.office.net/officehub/images... https://res.cdn.office.net/officehub/images/content/images/unauth-mcm/hero-module2-9b20271b1e.png — 200 — 131.9 KiB — 64 ms — h2https://res.cdn.office.net/officehub/images/content/images/unauth-mcm/hero-module3-89c3b2f316.pngres.cdn.office.net/officehub/images... 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0 64 64' stro…www.w3.org/2000/svg' viewBox='0 0 6... data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 64 64' stro… — 200 — 0 B — 0 ms — datahttps://mem.gfx.ms/me/mecache?partner=office&wreply=https%3A%2F%2Fwww.office.commem.gfx.ms/me/mecache?partner=offic... https://mem.gfx.ms/me/mecache?partner=office&wreply=https%3A%2F%2Fwww.office.com — 200 — 1.3 KiB — 24 ms — h2https://c.s-microsoft.com/static/fonts/segoe-ui/west-european/normal/latest.woff2c.s-microsoft.com/static/fonts/sego... https://c.s-microsoft.com/static/fonts/segoe-ui/west-european/normal/latest.woff2 — 200 — 33.5 KiB — 24 ms — h2https://www.microsoft.com/mwf/_h/v3.54/mwf.app/fonts/mwfmdl2-v3.54.woffwww.microsoft.com/mwf/_h/v3.54/mwf.... https://www.microsoft.com/mwf/_h/v3.54/mwf.app/fonts/mwfmdl2-v3.54.woff — 200 — 26.4 KiB — 82 ms — h2https://c.s-microsoft.com/static/fonts/segoe-ui/west-european/Bold/latest.woff2c.s-microsoft.com/static/fonts/sego... https://c.s-microsoft.com/static/fonts/segoe-ui/west-european/Bold/latest.woff2 — 200 — 29.6 KiB — 18 ms — h2https://c.s-microsoft.com/static/fonts/segoe-ui/west-european/Semibold/latest.woff2c.s-microsoft.com/static/fonts/sego... https://c.s-microsoft.com/static/fonts/segoe-ui/west-european/Semibold/latest.woff2 — 200 — 28.9 KiB — 20 ms — h2https://res.cdn.office.net/officehub/images/content/images/favicon_copilot-4370172aa6.icores.cdn.office.net/officehub/images... https://res.cdn.office.net/officehub/images/content/images/favicon_copilot-4370172aa6.ico — 200 — 9.5 KiB — 35 ms — h3https://b.clarity.ms/collectb.clarity.ms/collect https://b.clarity.ms/collect — 204 — 278 B — 207 ms — http/1.1https://res.cdn.office.net/admincenter/admin-main/2026.4.2.8/floodgate.en.bundle.jsres.cdn.office.net/admincenter/admi... https://res.cdn.office.net/admincenter/admin-main/2026.4.2.8/floodgate.en.bundle.js — 200 — 332.1 KiB — 25 ms — h3https://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 — 206 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 — 760 B — 211 ms — h2https://admin.microsoft.com/api/instrument/logclientadmin.microsoft.com/api/instrument/... https://admin.microsoft.com/api/instrument/logclient — 200 — 0 B — 536 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 — 451 B — 61 ms — h2https://browser.events.data.microsoft.com/OneCollector/1.0/?cors=true&content-type=application/x-json-stream&w=2browser.events.data.microsoft.com/O... https://browser.events.data.microsoft.com/OneCollector/1.0/?cors=true&content-type=application/x-json-stream&w=2 — 200 — 0 B — 42 ms — h2https://browser.events.data.microsoft.com/OneCollector/1.0/?cors=true&content-type=application/x-json-stream&w=2browser.events.data.microsoft.com/O... https://browser.events.data.microsoft.com/OneCollector/1.0/?cors=true&content-type=application/x-json-stream&w=2 — 200 — 108 B — 87 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 — 456 B — 165 ms — h2https://admin.microsoft.com/api/instrument/logclientadmin.microsoft.com/api/instrument/... https://admin.microsoft.com/api/instrument/logclient — 204 — 261 B — 360 ms — h2https://browser.events.data.microsoft.com/OneCollector/1.0/?cors=true&content-type=application/x-json-stream&w=2browser.events.data.microsoft.com/O... https://browser.events.data.microsoft.com/OneCollector/1.0/?cors=true&content-type=application/x-json-stream&w=2 — 200 — 90 B — 86 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 4295ms · 810KB · $25/mo
res.cdn.office.net
Other
Costly
Execution 935ms
Transfer 35 KB
Monthly Cost $5/mo
res.cdn.office.net
Other
Costly
Execution 721ms
Transfer 64 KB
Unused 38%
Monthly Cost $4/mo
Unattributable
Other
Costly
Execution 611ms
Transfer 0 KB
Monthly Cost $4/mo
res.cdn.office.net
Other
Costly
Execution 445ms
Transfer 332 KB
Unused 88%
Monthly Cost $3/mo
res.cdn.office.net
Other
Costly
Execution 359ms
Transfer 187 KB
Unused 51%
Monthly Cost $2/mo
www.microsoft.com
Other
Costly
Execution 231ms
Transfer 37 KB
Unused 64%
Monthly Cost $1/mo
www.office.com
Other
Costly
Execution 221ms
Transfer 39 KB
Monthly Cost $1/mo
mem.gfx.ms
Other
Costly
Execution 219ms
Transfer 10 KB
Monthly Cost $1/mo
Microsoft Clarity
Session Replay
Costly
Execution 218ms
Transfer 26 KB
Monthly Cost $1/mo
mem.gfx.ms
Other
Optional
Execution 152ms
Transfer 61 KB
Monthly Cost $1/mo
res.cdn.office.net
Other
Optional
Execution 113ms
Transfer 2 KB
Monthly Cost $1/mo
mem.gfx.ms
Other
Optional
Execution 70ms
Transfer 16 KB
Monthly Cost $0/mo

These scripts may cost more than they're worth

  • res.cdn.office.net adds 935ms and costs ~$5/month
  • res.cdn.office.net adds 721ms and costs ~$4/month
  • Unattributable adds 611ms and costs ~$4/month
  • res.cdn.office.net adds 445ms and costs ~$3/month
  • res.cdn.office.net adds 359ms and costs ~$2/month
  • www.microsoft.com adds 231ms and costs ~$1/month
  • www.office.com adds 221ms and costs ~$1/month
  • mem.gfx.ms adds 219ms and costs ~$1/month
  • Microsoft Clarity adds 218ms and costs ~$1/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

res.cdn.office.net takes 935ms 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

res.cdn.office.net takes 721ms 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 611ms 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

res.cdn.office.net 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

88% of res.cdn.office.net'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

res.cdn.office.net takes 359ms 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

51% of res.cdn.office.net'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

www.microsoft.com takes 231ms 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 www.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

www.office.com takes 221ms 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

mem.gfx.ms 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

Microsoft Clarity takes 218ms 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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