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.
3.34 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
12.66 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
3.18 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.011
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
7.62 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.
16.88 s
Page Load Progression
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction9289ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://tagdelivery.mayoclinic.org/dotorg-aem/prod/utag.2.js?utv=ut4.54.202603302122 | 1968ms | 1963ms | 4ms | 3rd |
| https://www.mayoclinic.org/_next/static/chunks/framework-a6b401aab1c737ef.js | 1537ms | 1241ms | 25ms | 3rd |
| https://tagdelivery.mayoclinic.org/dotorg-aem/prod/utag.js | 1144ms | 998ms | 21ms | 3rd |
| Unattributable | 1111ms | 61ms | 0ms | 3rd |
| https://www.mayoclinic.org/jCPSYPzXpzyIf/HOY8oen2LdQb/_A/5b3rNtcYiOS3fVub/QTcvXmg7/UEd/XOjtnIhAB | 900ms | 797ms | 77ms | 3rd |
| https://www.mayoclinic.org/ | 808ms | 19ms | 4ms | 3rd |
| https://www.mayoclinic.org/_next/static/chunks/pages/_app-0e0c06edaf061b5f.js | 460ms | 236ms | 154ms | 3rd |
| https://xih9lsprjt.kameleoon.io/engine.js | 374ms | 307ms | 48ms | 3rd |
| https://nexus.ensighten.com/mayo_clinic/clinic_aem_prod/Bootstrap.js | 269ms | 212ms | 39ms | 3rd |
| https://resources.digital-cloud-west.medallia.com/wdcwest/160107/onsite/generic1774895978140.js | 257ms | 140ms | 49ms | 3rd |
Showing top 10 of 13 scripts
DPage Weight InventoryAction103 resources · 1.9 MB · 285 KB savings availableFIX
~284.7 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 103 resources | 1.9 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CPage Weight BudgetAction1.9 MB transferred, 103 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
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
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.
Source: web.dev
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
CJS BundlesAction42 scripts, 285 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://resources.digital-cloud-west.medallia.com/wdcwest/160107/onsite/generic1774895978140.js | 86 KB | 43 KB (50%) | ✓ | 3rd |
| https://nexus.ensighten.com/mayo_clinic/clinic_aem_prod/Bootstrap.js | 74 KB | 43 KB (58%) | ✓ | 3rd |
| https://www.mayoclinic.org/_next/static/chunks/pages/_app-0e0c06edaf061b5f.js | 169 KB | 40 KB (24%) | ✓ | 3rd |
| https://www.mayoclinic.org/jCPSYPzXpzyIf/HOY8oen2LdQb/_A/5b3rNtcYiOS3fVub/QTcvXmg7/UEd/XOjtnIhAB | 179 KB | 38 KB (21%) | ✓ | 3rd |
| https://assets.mayoclinic.org/content/dam/cpm-transcend/ui.js | 83 KB | 38 KB (46%) | ✓ | 3rd |
| https://s.go-mpulse.net/boomerang/AE377-TGE2S-92GPZ-AE4B3-VR4DY | 43 KB | 30 KB (70%) | ✓ | 3rd |
| https://transcend-cdn.com/cm/03274c75-bbc2-448d-a72f-379289a8e380/airgap.js | 58 KB | 27 KB (47%) | ✓ | 3rd |
| https://www.mayoclinic.org/_next/static/chunks/framework-a6b401aab1c737ef.js | 49 KB | 25 KB (52%) | ✓ | 3rd |
| https://www.mayoclinic.org/_next/static/chunks/338.c3bc386a285fdac8.js | 1 KB | — | ✓ | 3rd |
| https://xih9lsprjt.kameleoon.io/engine.js | 67 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
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
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 Loading5 fonts (205 KB)PASS
Web fonts
5
205 KB total
Render-blocking
0
of 5
Dominant font-display
swap
Most common across fonts
Font loading timeline
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 CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource Hints2 hints, 0 missing preconnectsPASS
Current Resource Hints
2 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall103 requests over 4696msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
tagdelivery.mayoclinic.org tagdelivery.mayoclinic.org | Other | 1968ms | 9 KB | — | $11/mo | Costly |
www.mayoclinic.org www.mayoclinic.org | Other | 1537ms | 49 KB | 52% | $9/mo | Costly |
tagdelivery.mayoclinic.org tagdelivery.mayoclinic.org | Other | 1144ms | 41 KB | — | $7/mo | Costly |
Unattributable Unattributable | Other | 1111ms | 0 KB | — | $6/mo | Costly |
www.mayoclinic.org www.mayoclinic.org | Other | 900ms | 1 KB | 21% | $5/mo | Costly |
www.mayoclinic.org www.mayoclinic.org | Other | 808ms | 0 KB | — | $5/mo | Costly |
www.mayoclinic.org www.mayoclinic.org | Other | 460ms | 169 KB | 24% | $3/mo | Costly |
xih9lsprjt.kameleoon.io xih9lsprjt.kameleoon.io | Other | 374ms | 67 KB | — | $2/mo | Costly |
nexus.ensighten.com nexus.ensighten.com | Other | 269ms | 74 KB | 58% | $2/mo | Costly |
resources.digital-cloud-west.medallia.com resources.digital-cloud-west.medallia.com | Other | 257ms | 86 KB | 50% | $1/mo | Costly |
assets.mayoclinic.org assets.mayoclinic.org | Other | 244ms | 83 KB | 46% | $1/mo | Costly |
transcend-cdn.com transcend-cdn.com | Other | 150ms | 58 KB | 47% | $1/mo | Optional |
www.mayoclinic.org www.mayoclinic.org | Other | 67ms | 27 KB | — | $0/mo | Optional |
These scripts may cost more than they're worth
- tagdelivery.mayoclinic.org adds 1968ms and costs ~$11/month
- www.mayoclinic.org adds 1537ms and costs ~$9/month
- tagdelivery.mayoclinic.org adds 1144ms and costs ~$7/month
- Unattributable adds 1111ms and costs ~$6/month
- www.mayoclinic.org adds 900ms and costs ~$5/month
- www.mayoclinic.org adds 808ms and costs ~$5/month
- www.mayoclinic.org adds 460ms and costs ~$3/month
- xih9lsprjt.kameleoon.io adds 374ms and costs ~$2/month
- nexus.ensighten.com adds 269ms and costs ~$2/month
- resources.digital-cloud-west.medallia.com adds 257ms and costs ~$1/month
- assets.mayoclinic.org adds 244ms 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
tagdelivery.mayoclinic.org takes 1968ms 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.mayoclinic.org takes 1537ms 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
52% of www.mayoclinic.org'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
tagdelivery.mayoclinic.org takes 1144ms 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 1111ms 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.mayoclinic.org takes 900ms 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.mayoclinic.org takes 808ms 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.mayoclinic.org takes 460ms 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
xih9lsprjt.kameleoon.io takes 374ms 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
nexus.ensighten.com takes 269ms 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
58% of nexus.ensighten.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
resources.digital-cloud-west.medallia.com takes 257ms 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
50% of resources.digital-cloud-west.medallia.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
assets.mayoclinic.org takes 244ms 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