Performance
· 17 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.
4.33 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
6.29 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
1.75 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.386
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
4.57 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.
16.49 s
Page Load Progression
DPage Weight BudgetAction2.2 MB transferred, 95 requestsFIX
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
Subset fonts to include only used characters, or switch to system font stacks.
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.
CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.
Source: web.dev
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction5996ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.microsoft.com/echo/etc.clientlibs/microsoft/components/structure/page/clientlibs/custom-oneds.ACSHASHbf880242325f20f5b8644293f4586135.min.js | 1506ms | 746ms | 563ms | 3rd |
| Unattributable | 1156ms | 173ms | 0ms | 3rd |
| https://www.microsoft.com/nl-nl | 998ms | 37ms | 11ms | 3rd |
| https://www.microsoft.com/echo/etc.clientlibs/cascade.component.authoring/clientlibs/clientlib-base.ACSHASH7e89d60ab495cd79ad67f82f4ceb5b7f.min.js | 543ms | 432ms | 34ms | 3rd |
| https://www.microsoft.com/echo/etc.clientlibs/microsoft/clientlibs/clientlib-mwf-new/main-light.ACSHASHf8a6ecd849f93a3e5d989c0cee0ceb80.min.js | 380ms | 194ms | 99ms | 3rd |
| https://scripts.clarity.ms/0.8.59/clarity.js | 380ms | 354ms | 14ms | 3rd |
| https://uhf.microsoft.com/statics/20260421.16.02/js/index-Cifsy-6O.js | 379ms | 131ms | 2ms | 3rd |
| https://www.microsoft.com/echo/etc.clientlibs/cascade.component.authoring/clientlibs/clientlib-jquery.ACSHASH75d0cb3e9ff9fee40f5ce5fd93c17fb2.min.js | 202ms | 177ms | 17ms | 3rd |
| https://www.microsoft.com/echo/etc.clientlibs/microsoft/components/structure/page/clientlibs/experimentation.ACSHASHe8ee6e3433a60c66439eaf7e8101f8d8.min.js | 171ms | 152ms | 17ms | 3rd |
| https://uhf.microsoft.com/statics/20260421.16.02/js/index-CuY0u_Xq.js | 124ms | 114ms | 4ms | 3rd |
Showing top 10 of 12 scripts
DJS BundlesAction36 scripts, 152 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.microsoft.com/echo/etc.clientlibs/microsoft/clientlibs/clientlib-mwf-new/main-light.ACSHASHf8a6ecd849f93a3e5d989c0cee0ceb80.min.js | 113 KB | 64 KB (57%) | ✗ | 3rd |
| https://uhf.microsoft.com/statics/20260421.16.02/js/index-CuY0u_Xq.js | 104 KB | 48 KB (47%) | ✗ | 3rd |
| https://www.microsoft.com/echo/etc.clientlibs/cascade.component.authoring/clientlibs/clientlib-base.ACSHASH7e89d60ab495cd79ad67f82f4ceb5b7f.min.js | 58 KB | 40 KB (70%) | ✗ | 3rd |
| https://www.microsoft.com/echo/etc.clientlibs/cascade.component.authoring/clientlibs/clientlib-cookieconsent.ACSHASHc892f451b0c4db9c8ab2601a427c9b2c.min.js | 1 KB | — | ✓ | 3rd |
| https://www.microsoft.com/echo/etc.clientlibs/microsoft/components/structure/page/clientlibs/featurecontrol.ACSHASHf120033122e43a4cb0b53bb306afc5dc.min.js | 1 KB | — | ✓ | 3rd |
| https://www.microsoft.com/echo/etc.clientlibs/cascade.component.authoring/dynamicclientsidelibs/handlerscripts/v1.ACSHASH6734c5d7a732130b83c7d4a6ba54dcec.min.js | 1 KB | — | ✓ | 3rd |
| https://www.microsoft.com/echo/etc.clientlibs/microsoft/components/content/universalheader/v1/universalheader/clientlibs/site.ACSHASH69d585e01cb601a02e396b34fdcab8c4.min.js | 7 KB | — | ✓ | 3rd |
| https://uhf.microsoft.com/statics/20260421.16.02/js/entry.js | 2 KB | — | ✓ | 3rd |
| https://www.microsoft.com/echo/etc.clientlibs/microsoft/components/content/dynamic-price/v1/dynamic-price/clientlibs/sites.ACSHASHa26d031bf8c00f082570666bfff25659.min.js | 1 KB | — | ✓ | 3rd |
| https://www.microsoft.com/echo/etc.clientlibs/microsoft/components/content/calltoaction/v1/calltoaction/clientlibs/site.ACSHASH6069c9c4123345cb32954882a5e52e8d.min.js | 1 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
DPage Weight InventoryAction95 resources · 2.2 MB · 152 KB savings availableFIX
~151.9 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 95 resources | 2.2 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction17 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
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 Loading9 fonts (435 KB)PASS
Web fonts
9
435 KB total
Render-blocking
0
of 9
Dominant font-display
swap
Most common across fonts
Font loading timeline
- 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 ~154 KB and ~308 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource Hints37 hints, 0 missing preconnectsPASS
Current Resource Hints
37 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall95 requests over 3913msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.microsoft.com www.microsoft.com | Other | 1506ms | 553 KB | — | €8/mo | Costly |
Unattributable Unattributable | Other | 1156ms | 0 KB | — | €6/mo | Costly |
www.microsoft.com www.microsoft.com | Other | 998ms | 23 KB | — | €5/mo | Costly |
www.microsoft.com www.microsoft.com | Other | 543ms | 58 KB | 70% | €3/mo | Costly |
www.microsoft.com www.microsoft.com | Other | 380ms | 113 KB | 57% | €2/mo | Costly |
Microsoft Clarity scripts.clarity.ms | Session Replay | 380ms | 26 KB | — | €2/mo | Costly |
uhf.microsoft.com uhf.microsoft.com | Other | 379ms | 31 KB | — | €2/mo | Costly |
www.microsoft.com www.microsoft.com | Other | 202ms | 33 KB | — | €1/mo | Costly |
www.microsoft.com www.microsoft.com | Other | 171ms | 35 KB | — | €1/mo | Optional |
uhf.microsoft.com uhf.microsoft.com | Other | 124ms | 104 KB | 47% | €1/mo | Optional |
www.microsoft.com www.microsoft.com | Other | 87ms | 48 KB | — | €0/mo | Optional |
wcpstatic.microsoft.com wcpstatic.microsoft.com | Other | 71ms | 274 KB | — | €0/mo | Optional |
These scripts may cost more than they're worth
- www.microsoft.com adds 1506ms and costs ~€8/month
- Unattributable adds 1156ms and costs ~€6/month
- www.microsoft.com adds 998ms and costs ~€5/month
- www.microsoft.com adds 543ms and costs ~€3/month
- www.microsoft.com adds 380ms and costs ~€2/month
- Microsoft Clarity adds 380ms and costs ~€2/month
- uhf.microsoft.com adds 379ms and costs ~€2/month
- www.microsoft.com adds 202ms 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
www.microsoft.com takes 1506ms 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
Unattributable takes 1156ms 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
www.microsoft.com takes 998ms 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
www.microsoft.com takes 543ms 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
70% of www.microsoft.com'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
www.microsoft.com takes 380ms 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
57% of www.microsoft.com'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
Microsoft Clarity takes 380ms 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
uhf.microsoft.com takes 379ms 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
www.microsoft.com takes 202ms 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