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.
946 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.67 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
17 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.026
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
1.39 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.
4.96 s
Page Load Progression
DPage Weight BudgetAction2.1 MB transferred, 62 requestsFIX
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
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DPage Weight InventoryAction62 resources · 2.1 MB · 172 KB savings availableFIX
~172.4 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 62 resources | 2.1 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
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
BJS Execution Cost705ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.cms.gov/ | 192ms | 1ms | 0ms | 3rd |
| https://design.cms.gov/cdn/ds-cms-gov/12.4.3/web-components/bundle/ds-alert.js | 182ms | 162ms | 0ms | 3rd |
| https://gov1.siteintercept.qualtrics.com/dxjsmodule/5.17c364950fcb67448399.chunk.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=medicare | 128ms | 121ms | 6ms | 3rd |
| Unattributable | 82ms | 5ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L | 66ms | 55ms | 10ms | 3rd |
| https://gov1.siteintercept.qualtrics.com/dxjsmodule/12.1a2b7192fd54e87d3971.chunk.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=www.cms.gov | 54ms | 36ms | 9ms | 3rd |
CJS BundlesAction31 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://tags.tiqcdn.com/utag/cmsgov/cms-www/prod/utag.33.js?utv=ut4.48.202604151345 | 5 KB | — | ✓ | 3rd |
| https://tags.tiqcdn.com/utag/tiqapp/utag.v.js?a=cmsgov/cms-www/202604151345&cb=1776803404175 | 0 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://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://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 Loading9 fonts (632 KB)PASS
Web fonts
9
632 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
- 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
- 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 ~245 KB and ~490 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
Network Waterfall62 requests over 6202msINFO
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 | 192ms | 32 KB | — | $3/mo | Optional |
design.cms.gov design.cms.gov | Other | 182ms | 4 KB | — | $2/mo | Optional |
gov1.siteintercept.qualtrics.com gov1.siteintercept.qualtrics.com | Other | 128ms | 74 KB | 77% | $2/mo | Optional |
Unattributable Unattributable | Other | 82ms | 0 KB | — | $1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 66ms | 147 KB | 41% | $1/mo | Optional |
gov1.siteintercept.qualtrics.com gov1.siteintercept.qualtrics.com | Other | 54ms | 36 KB | 99% | $1/mo | Optional |
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
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
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