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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
4
REVIEW
4
PASS
5
INFO
2

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

Mobile Desktop
89
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.
62
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.

1.15 s

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

1.66 s

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

22 ms

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

0.061

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

1.48 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.

3.82 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
15
5 PASS 4 REVIEW 4 FIX
F
Page Weight Budget
Action
3.0 MB transferred, 62 requests
FIX
3.0 MB transferred, 62 requests
Warning::
Page weighs 5.8 MB (3.0 MB transferred)
Warning::
Images are 1.5 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.5 MB
Warning::
JavaScript is 1.1 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.1 MB
Info::
62 HTTP requests
Info::
Estimated 0.62 g CO2 per page load
3.0 MB / 2.4 MB budget
3.0 MB transferred
62 requests
0.62 g CO2 per page load
Images 1.5 MiB 52%
JavaScript 1.1 MiB 37%
Fonts 165.8 KiB 5%
CSS 118.3 KiB 4%
HTML 47.1 KiB 2%
Other 10.6 KiB 0%
Other 4.3 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 (3.0 MiB of 3.0 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
16 scripts, 458 KB unused
FIX
16 scripts, 458 KB unused
Warning::
https://res.cdn.office.net/admincenter/admin-main/...: 292 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://res.cdn.office.net/officehub/bundles/unaut...: 24 KB unused (71%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.microsoft.com/onerfstatics/marketingsi...: 24 KB unused (65%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 458 KB
458 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://res.cdn.office.net/admincenter/admin-main/2026.4.13.2/floodgate.en.bundle.js334 KB292 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://res.cdn.office.net/officehub/bundles/unauth-vendor-f0ab3fa70e.js35 KB24 KB (71%)✓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 KB24 KB (65%)✓3rd
https://res.cdn.office.net/officehub/bundles/unauth-page-performance-fe909b4df2.js2 KB—✓3rd
https://wcpstatic.microsoft.com/mscc/lib/v2/wcp-consent.js274 KB—✓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://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

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
62 resources · 3.0 MB · 458 KB savings available
FIX
62 resources · 3.0 MB · 458 KB savings available
Warning::
Page weight 2.0 MB over 1MB target
Got: 3.0 MB Expected: ≤ 1 MB
Info::
~458 KB of savings available
Warning::
61 third-party resources (100% of weight)
Info::
4 resources over 200KB
62 resources · 3.0 MiB · 61 third-party 2.0 MiB over 1MB target
Image 52% · 1.5 MiB
JavaScript 37% · 1.1 MiB
Font 5% · 165.8 KiB
CSS 4% · 118.3 KiB
Document 2% · 48.2 KiB
Other 0% · 7.6 KiB

~458.0 KiB of savings available

Remove unused JavaScript: 458.0 KiB
C
Image Optimization
Action
16 images, 0 KB saveable
REVIEW
16 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://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.
16 images 1.5 MB
0 oversized -0 KB
15 legacy format
9 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

B
JS Execution Cost
747ms total JS execution
REVIEW
747ms total JS execution
Info::
https://res.cdn.office.net/officehub/bundles/unaut...: 212ms CPU time
Info::
https://www.office.com/: 139ms CPU time
Info::
https://res.cdn.office.net/admincenter/admin-main/...: 102ms CPU time
Info::
Unattributable: 93ms CPU time
Info::
https://scripts.clarity.ms/0.8.60-beta/clarity.js: 77ms CPU time
Warning::
Third-party scripts: 747ms (100% of total)

Main Thread Breakdown

Script Evaluation 51% Other 20% Style & Layout 13% Script Parsing & Compilation 10%
ScriptTotalScriptingParse/CompileParty
https://res.cdn.office.net/officehub/bundles/unauth-936aa5c11c.js212ms119ms5ms3rd
https://www.office.com/139ms10ms4ms3rd
https://res.cdn.office.net/admincenter/admin-main/2026.4.13.2/floodgate.en.bundle.js102ms66ms34ms3rd
Unattributable93ms2ms0ms3rd
https://scripts.clarity.ms/0.8.60-beta/clarity.js77ms62ms1ms3rd
https://res.cdn.office.net/officehub/bundles/unauth-odc-scripts-6378fb4b6f.js63ms41ms19ms3rd
https://res.cdn.office.net/officehub/bundles/unauth-vendor-f0ab3fa70e.js60ms55ms3ms3rd
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

B
HTTP Caching
private
REVIEW
private
Info::
Cache-Control header is set
Got: private
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

private

DirectiveValueMeaning
private—Only browser cache, not CDN/proxy
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 500 ms 1.0 s 1.5 s FCP 1.2 s LCP 1.7 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 — 29 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 — 35 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 — 34 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 — 31 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 — 28 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 — 28 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 — 34 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 29 ms
Start 298 ms
Risk FOUT — text flashes from fallback to web font
segoeui_regular.woff2 woff2 swap
Size 12 KB
Load time 35 ms
Start 298 ms
Risk FOUT — text flashes from fallback to web font
segoeui_semibold.woff2 woff2 swap
Size 12 KB
Load time 34 ms
Start 299 ms
Risk FOUT — text flashes from fallback to web font
segoeui_semilight.woff2 woff2 swap
Size 13 KB
Load time 31 ms
Start 299 ms
Risk FOUT — text flashes from fallback to web font
latest.woff2 woff2 swap
Size 33 KB
Load time 28 ms
Start 468 ms
Risk FOUT — text flashes from fallback to web font
mwfmdl2-v3.54.woff woff swap
Size 26 KB
Load time 28 ms
Start 471 ms
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 34 ms
Start 471 ms
Risk FOUT — text flashes from fallback to web font
latest.woff2 woff2 swap
Size 30 KB
Load time 4 ms
Start 923 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
62 requests over 3650ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 1.2 s LCP 1.7 shttps://view.officeapps.live.com// https://view.officeapps.live.com/ — 302 — 1.2 KiB — 130 ms — h2http://www.office.com/www.office.com/ http://www.office.com/ — 307 — 0 B — 2 ms — http/1.1https://www.office.com/www.office.com/ https://www.office.com/ — 200 — 45.8 KiB — 179 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 — 45 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 — 39 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 — 29 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 — 35 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 — 34 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 — 31 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 — 54 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 — 38 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 — 22 ms — h2https://res.cdn.office.net/officehub/bundles/unauth-odc-bebop-c818ad54d2.cssres.cdn.office.net/officehub/bundle... https://res.cdn.office.net/officehub/bundles/unauth-odc-bebop-c818ad54d2.css — 200 — 11.9 KiB — 17 ms — h2https://res.cdn.office.net/officehub/images/content/images/unauth-odc/word-icon-a0719c261c.svgres.cdn.office.net/officehub/images... https://res.cdn.office.net/officehub/images/content/images/unauth-odc/word-icon-a0719c261c.svg — 200 — 1.9 KiB — 31 ms — h2https://res.cdn.office.net/officehub/images/content/images/unauth-odc/excel-icon-058c14383a.svgres.cdn.office.net/officehub/images... https://res.cdn.office.net/officehub/images/content/images/unauth-odc/excel-icon-058c14383a.svg — 200 — 1.4 KiB — 32 ms — h3https://res.cdn.office.net/officehub/images/content/images/unauth-odc/powerpoint-icon-1c34216af9.svgres.cdn.office.net/officehub/images... https://res.cdn.office.net/officehub/images/content/images/unauth-odc/powerpoint-icon-1c34216af9.svg — 200 — 1.4 KiB — 36 ms — h3https://res.cdn.office.net/officehub/images/content/images/unauth-odc/copilot-icon-513486c4f9.svgres.cdn.office.net/officehub/images... 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398 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 — 449 B — 284 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 — 91 B — 270 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 747ms · 691KB · $4/mo
res.cdn.office.net
Other
Costly
Execution 212ms
Transfer 64 KB
Unused 38%
Monthly Cost $1/mo
www.office.com
Other
Optional
Execution 139ms
Transfer 46 KB
Monthly Cost $1/mo
res.cdn.office.net
Other
Optional
Execution 102ms
Transfer 334 KB
Unused 88%
Monthly Cost $1/mo
Unattributable
Other
Optional
Execution 93ms
Transfer 0 KB
Monthly Cost $1/mo
Microsoft Clarity
Session Replay
Optional
Execution 77ms
Transfer 25 KB
Monthly Cost $0/mo
res.cdn.office.net
Other
Optional
Execution 63ms
Transfer 187 KB
Unused 51%
Monthly Cost $0/mo
res.cdn.office.net
Other
Optional
Execution 60ms
Transfer 35 KB
Unused 71%
Monthly Cost $0/mo

These scripts may cost more than they're worth

  • res.cdn.office.net adds 212ms 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 212ms 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

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

71% 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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