Performance
· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
1.78 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
3.60 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
74 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.
1.88 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.
3.61 s
Page Load Progression
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DJS BundlesAction18 scripts, 432 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://res.cdn.office.net/admincenter/admin-main/2026.4.2.8/floodgate.en.bundle.js | 332 KB | 290 KB (88%) | ✓ | 3rd |
| https://res.cdn.office.net/officehub/bundles/unauth-odc-scripts-6378fb4b6f.js | 186 KB | 94 KB (51%) | ✓ | 3rd |
| https://res.cdn.office.net/officehub/bundles/unauth-936aa5c11c.js | 64 KB | 24 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=1 | 37 KB | 24 KB (66%) | ✓ | 3rd |
| https://res.cdn.office.net/officehub/bundles/unauth-page-performance-fe909b4df2.js | 1 KB | — | ✓ | 3rd |
| https://js.monitor.azure.com/scripts/c/ms.shared.analytics.mectrl-3.gbl.min.js | 35 KB | — | ✓ | 3rd |
| https://res.cdn.office.net/officehub/bundles/unauth-vendor-f0ab3fa70e.js | 34 KB | — | ✓ | 3rd |
| https://res.cdn.office.net/officehub/bundles/unauth-mcm-faq-3ed592771b.js | 1 KB | — | ✓ | 3rd |
| https://res.cdn.office.net/officehub/bundles/microsoft-clarity-ff3e2df9ac.js | 2 KB | — | ✓ | 3rd |
| https://mem.gfx.ms/meversion?partner=office&market=en-us&uhf=1 | 10 KB | — | ✓ | 3rd |
Consider code splitting or tree shaking to reduce unused code.
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.
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.
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.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
FPage Weight InventoryAction68 resources · 1.8 MB · 432 KB savings availableFIX
~432.0 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 68 resources | 1.8 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CPage Weight BudgetAction1.8 MB transferred, 68 requestsREVIEW
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.
Source: web.dev
CImage OptimizationAction18 images, 0 KB saveableREVIEW
Set explicit width and height to prevent CLS.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
CJS Execution CostAction1026ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://res.cdn.office.net/officehub/bundles/unauth-936aa5c11c.js | 235ms | 123ms | 7ms | 3rd |
| https://res.cdn.office.net/officehub/bundles/unauth-vendor-f0ab3fa70e.js | 192ms | 93ms | 3ms | 3rd |
| https://res.cdn.office.net/admincenter/admin-main/2026.4.2.8/floodgate.en.bundle.js | 150ms | 87ms | 60ms | 3rd |
| Unattributable | 150ms | 2ms | 0ms | 3rd |
| https://res.cdn.office.net/officehub/bundles/unauth-odc-scripts-6378fb4b6f.js | 97ms | 52ms | 41ms | 3rd |
| https://scripts.clarity.ms/0.8.59/clarity.js | 71ms | 63ms | 3ms | 3rd |
| https://mem.gfx.ms/meversion?partner=office&market=en-us&uhf=1 | 66ms | 58ms | 1ms | 3rd |
| https://www.office.com/ | 64ms | 13ms | 4ms | 3rd |
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
A+Font Loading8 fonts (166 KB)PASS
Web fonts
8
166 KB total
Render-blocking
0
of 8
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Convert to woff2 for ~30% smaller file size
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 CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
Network Waterfall68 requests over 3151msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
res.cdn.office.net res.cdn.office.net | Other | 235ms | 64 KB | 38% | $1/mo | Costly |
res.cdn.office.net res.cdn.office.net | Other | 192ms | 34 KB | — | $1/mo | Optional |
res.cdn.office.net res.cdn.office.net | Other | 150ms | 332 KB | 88% | $1/mo | Optional |
Unattributable Unattributable | Other | 150ms | 0 KB | — | $1/mo | Optional |
res.cdn.office.net res.cdn.office.net | Other | 97ms | 186 KB | 51% | $1/mo | Optional |
Microsoft Clarity scripts.clarity.ms | Session Replay | 71ms | 26 KB | — | $0/mo | Optional |
mem.gfx.ms mem.gfx.ms | Other | 66ms | 10 KB | — | $0/mo | Optional |
www.office.com www.office.com | Other | 64ms | 39 KB | — | $0/mo | Optional |
These scripts may cost more than they're worth
- res.cdn.office.net adds 235ms and costs ~$1/month
100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.
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 235ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
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.
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.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev