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.
3.13 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
9.39 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
1.14 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.078
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
4.66 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.
12.66 s
Page Load Progression
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DJS Execution CostAction3486ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.cms.gov/ | 825ms | 5ms | 1ms | 3rd |
| https://design.cms.gov/cdn/ds-cms-gov/12.4.3/web-components/bundle/ds-alert.js | 746ms | 670ms | 2ms | 3rd |
| https://gov1.siteintercept.qualtrics.com/dxjsmodule/5.17c364950fcb67448399.chunk.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=medicare | 619ms | 566ms | 28ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L | 340ms | 297ms | 39ms | 3rd |
| Unattributable | 323ms | 18ms | 0ms | 3rd |
| https://gov1.siteintercept.qualtrics.com/dxjsmodule/12.1a2b7192fd54e87d3971.chunk.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=www.cms.gov | 232ms | 162ms | 30ms | 3rd |
| https://www.cms.gov/sites/default/files/js/js_llcaMctR7hWYEb0BOuWE36GJZJm-QnyOEi003O56M2Y.js?scope=footer&delta=1&language=en&theme=cms_evo&include=eJxtj8FyAzEIQ38ozn7SDsaq44kNW8Bp-_fdHOL2kBMaPWAkvqO0UNuJWa00lW2p64epBKRcePiOh27UYZG-kBPrOFQgsdhzDlQakLlMfB8khXJHCj0aJyb7e1e7ZuoJzik3KU3qQjdQgSUHGd-Sz1rhcWbyfxumL5678v0teXdp8DO7t8cZivLpq2ErNg_qV5qhz24dgUuAepujfW5L7eQ_wr8O6Hif | 126ms | 118ms | 5ms | 3rd |
| https://gov1.siteintercept.qualtrics.com/dxjsmodule/17.5339c461e1518fcc3620.chunk.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=medicare | 99ms | 87ms | 11ms | 3rd |
| https://cdn1.adoberesources.net/alloy/2.6.4/alloy.min.js | 63ms | 55ms | 7ms | 3rd |
| https://tealium-tags.cms.gov/cms-www/prod/utag.js | 59ms | 48ms | 10ms | 3rd |
Showing top 10 of 11 scripts
DPage Weight InventoryAction64 resources · 2.1 MB · 172 KB savings availableFIX
~172.3 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 64 resources | 2.1 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CPage Weight BudgetAction2.1 MB transferred, 64 requestsREVIEW
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
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
BImage Optimization5 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
CJS BundlesAction32 scripts, 172 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L | 147 KB | 60 KB (41%) | ✓ | 3rd |
| https://gov1.siteintercept.qualtrics.com/dxjsmodule/5.17c364950fcb67448399.chunk.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=medicare | 74 KB | 56 KB (77%) | ✓ | 3rd |
| https://gov1.siteintercept.qualtrics.com/dxjsmodule/12.1a2b7192fd54e87d3971.chunk.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=www.cms.gov | 36 KB | 35 KB (99%) | ✓ | 3rd |
| https://gov1.siteintercept.qualtrics.com/dxjsmodule/CoreModule.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=medicare | 32 KB | 21 KB (67%) | ✓ | 3rd |
| https://www.cms.gov/sites/default/files/js/js_yR--fXUU50XrSAFxUFHMuwalUhntmxBD3qFf8dHR3JM.js?scope=footer&delta=7&language=en&theme=cms_evo&include=eJxtj8FyAzEIQ38ozn7SDsaq44kNW8Bp-_fdHOL2kBMaPWAkvqO0UNuJWa00lW2p64epBKRcePiOh27UYZG-kBPrOFQgsdhzDlQakLlMfB8khXJHCj0aJyb7e1e7ZuoJzik3KU3qQjdQgSUHGd-Sz1rhcWbyfxumL5678v0teXdp8DO7t8cZivLpq2ErNg_qV5qhz24dgUuAepujfW5L7eQ_wr8O6Hif | 28 KB | — | ✓ | 3rd |
| https://zn4gdyqqnaoifyulj-cmsmacfedramp.gov1.siteintercept.qualtrics.com/WRSiteInterceptEngine/?Q_ZID=ZN_4GdYQQNAoifyULj&Q_LOC=https%3A%2F%2Fwww.cms.gov%2F | 5 KB | — | ✓ | 3rd |
| https://design.cms.gov/cdn/ds-cms-gov/12.4.3/web-components/bundle/ds-usa-banner.js | 3 KB | — | ✓ | 3rd |
| https://design.cms.gov/cdn/ds-cms-gov/12.4.3/web-components/bundle/ds-alert.js | 4 KB | — | ✓ | 3rd |
| https://tealium-tags.cms.gov/cms-www/prod/utag.sync.js | 1 KB | — | ✓ | 3rd |
| https://tealium-tags.cms.gov/cms-www/prod/utag.js | 24 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
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 (596 KB)PASS
Web fonts
8
596 KB total
Render-blocking
0
of 8
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- Convert to woff2 for ~30% smaller file size
- 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
- 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 ~234 KB and ~468 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall64 requests over 7434msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.cms.gov www.cms.gov | Other | 825ms | 32 KB | — | $11/mo | Costly |
design.cms.gov design.cms.gov | Other | 746ms | 4 KB | — | $10/mo | Costly |
gov1.siteintercept.qualtrics.com gov1.siteintercept.qualtrics.com | Other | 619ms | 74 KB | 77% | $8/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 340ms | 147 KB | 41% | $5/mo | Costly |
Unattributable Unattributable | Other | 323ms | 0 KB | — | $4/mo | Costly |
gov1.siteintercept.qualtrics.com gov1.siteintercept.qualtrics.com | Other | 232ms | 36 KB | 99% | $3/mo | Costly |
www.cms.gov www.cms.gov | Other | 126ms | 15 KB | — | $2/mo | Optional |
gov1.siteintercept.qualtrics.com gov1.siteintercept.qualtrics.com | Other | 99ms | 38 KB | — | $1/mo | Optional |
cdn1.adoberesources.net cdn1.adoberesources.net | Other | 63ms | 20 KB | — | $1/mo | Optional |
tealium-tags.cms.gov tealium-tags.cms.gov | Other | 59ms | 24 KB | — | $1/mo | Optional |
cms_evo cms_evo | Other | 53ms | 0 KB | — | $1/mo | Optional |
These scripts may cost more than they're worth
- www.cms.gov adds 825ms and costs ~$11/month
- design.cms.gov adds 746ms and costs ~$10/month
- gov1.siteintercept.qualtrics.com adds 619ms and costs ~$8/month
- Google Tag Manager adds 340ms and costs ~$5/month
- Unattributable adds 323ms and costs ~$4/month
- gov1.siteintercept.qualtrics.com adds 232ms and costs ~$3/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.cms.gov takes 825ms 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
design.cms.gov takes 746ms 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
gov1.siteintercept.qualtrics.com takes 619ms 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
77% of gov1.siteintercept.qualtrics.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
Google Tag Manager takes 340ms 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 323ms 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
gov1.siteintercept.qualtrics.com takes 232ms 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
99% of gov1.siteintercept.qualtrics.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