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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
70
GRADE
C
FIX
6
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
54
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.
77
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
85
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.

4.01 s

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

17.38 s

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

328 ms

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.

6.12 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.

29.82 s

Page Load Progression

828 ms
1.7 s
2.5 s
3.3 s
4.1 s
5.0 s
5.8 s
6.6 s
Checks
17
7 PASS 2 REVIEW 6 FIX
F
Page Weight Budget
Action
14.3 MB transferred, 52 requests
FIX
14.3 MB transferred, 52 requests
Critical::
Page weighs 19.6 MB (14.3 MB transferred)
Warning::
Images are 5.3 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 5.3 MB
Warning::
JavaScript is 1.0 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.0 MB
Info::
52 HTTP requests
Info::
Estimated 3.0 g CO2 per page load
14.3 MB / 2.4 MB budget
14.3 MB transferred
52 requests
3.0 g CO2 per page load
Other 7.7 MiB 54%
Images 5.3 MiB 37%
JavaScript 1.0 MiB 7%
Fonts 139.4 KiB 1%
CSS 114.5 KiB 1%
HTML 30.5 KiB 0%
Other 9.6 KiB 0%
Other 3.9 KiB 0%
Other 3.3 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

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 (14.3 MiB of 14.3 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
3684ms total JS execution
FIX
3684ms total JS execution
Warning::
https://m365.cloud.microsoft/: 991ms CPU time
Warning::
https://res.cdn.office.net/officehub/bundles/unaut...: 887ms CPU time
Warning::
Unattributable: 731ms CPU time
Warning::
https://res.cdn.office.net/admincenter/admin-main/...: 356ms CPU time
Info::
https://scripts.clarity.ms/0.8.59/clarity.js: 208ms CPU time
Warning::
Third-party scripts: 3684ms (100% of total)

Main Thread Breakdown

Other 32% Script Evaluation 31% Style & Layout 14% Rendering 14% Script Parsing & Compilation 8%
ScriptTotalScriptingParse/CompileParty
https://m365.cloud.microsoft/991ms31ms14ms3rd
https://res.cdn.office.net/officehub/bundles/unauth-936aa5c11c.js887ms273ms16ms3rd
Unattributable731ms13ms0ms3rd
https://res.cdn.office.net/admincenter/admin-main/2026.4.2.8/floodgate.en.bundle.js356ms193ms153ms3rd
https://scripts.clarity.ms/0.8.59/clarity.js208ms173ms7ms3rd
https://res.cdn.office.net/officehub/bundles/unauth-mcm-scripts-6378fb4b6f.js205ms136ms58ms3rd
https://res.cdn.office.net/officehub/bundles/unauth-vendor-f0ab3fa70e.js198ms179ms11ms3rd
https://mem.gfx.ms/meversion?partner=office&market=en-us&uhf=1109ms102ms2ms3rd
D
JS Bundles
Action
15 scripts, 497 KB unused
FIX
15 scripts, 497 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://wcpstatic.microsoft.com/mscc/lib/v2/wcp-co...: 33 KB unused (14%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.microsoft.com/onerfstatics/marketingsi...: 29 KB unused (79%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://res.cdn.office.net/officehub/bundles/unaut...: 25 KB unused (74%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 497 KB
497 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-mcm-scripts-6378fb4b6f.js187 KB94 KB (51%)✓3rd
https://wcpstatic.microsoft.com/mscc/lib/v2/wcp-consent.js274 KB33 KB (14%)✓3rd
https://www.microsoft.com/onerfstatics/marketingsites-neu-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 KB29 KB (79%)✓3rd
https://res.cdn.office.net/officehub/bundles/unauth-vendor-f0ab3fa70e.js35 KB25 KB (74%)✓3rd
https://res.cdn.office.net/officehub/bundles/unauth-936aa5c11c.js64 KB25 KB (39%)✓3rd
https://res.cdn.office.net/officehub/bundles/otel-logger-39618b5914375db48ab3.js37 KB—✓3rd
https://res.cdn.office.net/officehub/bundles/microsoft-clarity-ff3e2df9ac.js2 KB—✓3rd
https://res.cdn.office.net/officehub/bundles/unauth-mcm-faq-3ed592771b.js1 KB—✓3rd
https://res.cdn.office.net/officehub/bundles/unauth-page-performance-fe909b4df2.js2 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

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
52 resources · 14.3 MB · 497 KB savings available
FIX
52 resources · 14.3 MB · 497 KB savings available
Warning::
Page weight 13.3 MB over 1MB target
Got: 14.3 MB Expected: ≤ 1 MB
Info::
~497 KB of savings available
Warning::
51 third-party resources (100% of weight)
Info::
8 resources over 200KB
52 resources · 14.3 MiB · 51 third-party 13.3 MiB over 1MB target
Media 54% · 7.7 MiB
Image 37% · 5.3 MiB
JavaScript 7% · 1.0 MiB
Font 1% · 139.4 KiB
CSS 1% · 114.5 KiB
Document 0% · 30.5 KiB
Other 0% · 7.4 KiB

~496.6 KiB of savings available

Remove unused JavaScript: 496.6 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.

B
Image Optimization
7 images, 0 KB saveable
REVIEW
7 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.
7 images 5.3 MB
0 oversized -0 KB
7 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

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
9 fonts (139 KB)
PASS
9 fonts (139 KB)
Info::
9 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

9

139 KB total

Render-blocking

0

of 9

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 14.0 s 16.0 s 18.0 s FCP 4.0 s LCP 17.4 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 — 54 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 — 11.7 KiB — 53 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 — 57 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 — 56 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 — 60 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 — 0 B — 86 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 — 4 ms — font-display: swaphttps://www.microsoft.com/mwf/_h/v3.54/mwf.app/fonts/mwfmdl2-v3.54.ttfmwfmdl2-v3.54.ttf https://www.microsoft.com/mwf/_h/v3.54/mwf.app/fonts/mwfmdl2-v3.54.ttf — 0 B — 28 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 — 4 ms — font-display: swap
segoeui_light.woff2 woff2 swap
Size 11 KB
Load time 54 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
segoeui_regular.woff2 woff2 swap
Size 12 KB
Load time 53 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
segoeui_semibold.woff2 woff2 swap
Size 12 KB
Load time 57 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
segoeui_semilight.woff2 woff2 swap
Size 13 KB
Load time 56 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
latest.woff2 woff2 swap
Size 33 KB
Load time 60 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
mwfmdl2-v3.54.woff woff swap
Size 0 KB
Load time 86 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
latest.woff2 woff2 swap
Size 29 KB
Load time 4 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
mwfmdl2-v3.54.ttf ttf swap
Size 0 KB
Load time 28 ms
Start 1.3 s
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 4 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
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
52 requests over 4319ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s FCP 4.0 s LCP 17.4 shttps://cloud.microsoft// https://cloud.microsoft/ — 301 — 133 B — 826 ms — h2https://m365.cloud.microsoft/m365.cloud.microsoft/ https://m365.cloud.microsoft/ — 200 — 30.5 KiB — 169 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 — 82.2 KiB — 50 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 — 51 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 — 54 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 — 11.7 KiB — 53 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 — 57 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 — 56 ms — h2https://www.microsoft.com/onerfstatics/marketingsites-neu-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... https://www.microsoft.com/onerfstatics/marketingsites-neu-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_3231 — 200 — 23.1 KiB — 63 ms — h2https://res.cdn.office.net/officehub/bundles/microsoft-clarity-ff3e2df9ac.jsres.cdn.office.net/officehub/bundle... https://res.cdn.office.net/officehub/bundles/microsoft-clarity-ff3e2df9ac.js — 200 — 2.3 KiB — 57 ms — h2https://res.cdn.office.net/officehub/bundles/unauth-mcm-bebop-0200c4778d.cssres.cdn.office.net/officehub/bundle... https://res.cdn.office.net/officehub/bundles/unauth-mcm-bebop-0200c4778d.css — 200 — 8.1 KiB — 51 ms — h2https://res.cdn.office.net/officehub/images/content/images/unauth-mcm/bebop-hero-5936ea4e84.pngres.cdn.office.net/officehub/images... https://res.cdn.office.net/officehub/images/content/images/unauth-mcm/bebop-hero-5936ea4e84.png — 200 — 2.5 MiB — 92 ms — h3https://res.cdn.office.net/officehub/images/content/images/unauth/copilot-app-4b262e7e56.svgres.cdn.office.net/officehub/images... https://res.cdn.office.net/officehub/images/content/images/unauth/copilot-app-4b262e7e56.svg — 200 — 1.3 KiB — 13 ms — h3https://res.cdn.office.net/officehub/images/content/images/unauth/powerpoint-17c3d2817a.svgres.cdn.office.net/officehub/images... https://res.cdn.office.net/officehub/images/content/images/unauth/powerpoint-17c3d2817a.svg — 200 — 820 B — 13 ms — h3https://res.cdn.office.net/officehub/bundles/unauth-mcm-prompt-carousel-dcd5fb7ee0.jsres.cdn.office.net/officehub/bundle... https://res.cdn.office.net/officehub/bundles/unauth-mcm-prompt-carousel-dcd5fb7ee0.js — 200 — 4.1 KiB — 13 ms — h2https://res.cdn.office.net/officehub/bundles/unauth-mcm-faq-3ed592771b.jsres.cdn.office.net/officehub/bundle... https://res.cdn.office.net/officehub/bundles/unauth-mcm-faq-3ed592771b.js — 200 — 1.5 KiB — 14 ms — h2https://res.cdn.office.net/officehub/bundles/unauth-vendor-f0ab3fa70e.jsres.cdn.office.net/officehub/bundle... https://res.cdn.office.net/officehub/bundles/unauth-vendor-f0ab3fa70e.js — 200 — 35.1 KiB — 21 ms — h2https://res.cdn.office.net/officehub/bundles/unauth-936aa5c11c.jsres.cdn.office.net/officehub/bundle... https://res.cdn.office.net/officehub/bundles/unauth-936aa5c11c.js — 200 — 64.4 KiB — 24 ms — h2https://res.cdn.office.net/officehub/bundles/otel-logger-39618b5914375db48ab3.jsres.cdn.office.net/officehub/bundle... https://res.cdn.office.net/officehub/bundles/otel-logger-39618b5914375db48ab3.js — 200 — 36.5 KiB — 26 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 — 337 ms — h2https://www.microsoft.com/onerfstatics/marketingsites-neu-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=1www.microsoft.com/onerfstatics/mark... https://www.microsoft.com/onerfstatics/marketingsites-neu-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=1 — 200 — 37.1 KiB — 32 ms — h2https://res.cdn.office.net/officehub/bundles/unauth-mcm-scripts-6378fb4b6f.jsres.cdn.office.net/officehub/bundle... https://res.cdn.office.net/officehub/bundles/unauth-mcm-scripts-6378fb4b6f.js — 200 — 186.7 KiB — 39 ms — h2https://res.cdn.office.net/officehub/bundles/unauth-page-performance-fe909b4df2.jsres.cdn.office.net/officehub/bundle... https://res.cdn.office.net/officehub/bundles/unauth-page-performance-fe909b4df2.js — 200 — 1.7 KiB — 9 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 3684ms · 685KB · $21/mo
m365.cloud.microsoft
Other
Costly
Execution 991ms
Transfer 30 KB
Monthly Cost $6/mo
res.cdn.office.net
Other
Costly
Execution 887ms
Transfer 64 KB
Unused 39%
Monthly Cost $5/mo
Unattributable
Other
Costly
Execution 731ms
Transfer 0 KB
Monthly Cost $4/mo
res.cdn.office.net
Other
Costly
Execution 356ms
Transfer 332 KB
Unused 88%
Monthly Cost $2/mo
Microsoft Clarity
Session Replay
Costly
Execution 208ms
Transfer 26 KB
Monthly Cost $1/mo
res.cdn.office.net
Other
Costly
Execution 205ms
Transfer 187 KB
Unused 51%
Monthly Cost $1/mo
res.cdn.office.net
Other
Optional
Execution 198ms
Transfer 35 KB
Unused 74%
Monthly Cost $1/mo
mem.gfx.ms
Other
Optional
Execution 109ms
Transfer 10 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • m365.cloud.microsoft adds 991ms and costs ~$6/month
  • res.cdn.office.net adds 887ms and costs ~$5/month
  • Unattributable adds 731ms and costs ~$4/month
  • res.cdn.office.net adds 356ms and costs ~$2/month
  • Microsoft Clarity adds 208ms and costs ~$1/month
  • res.cdn.office.net adds 205ms 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

m365.cloud.microsoft takes 991ms 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 887ms 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 731ms 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 356ms 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

Microsoft Clarity takes 208ms 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 205ms 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

74% 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

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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