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.
9.91 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
28.68 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
971 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.013
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
13.53 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.
29.94 s
Page Load Progression
FPage Weight BudgetAction2.8 MB transferred, 163 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
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
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction3627ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 655ms | 7ms | 0ms | 3rd |
| https://www.usgs.gov/ | 649ms | 7ms | 2ms | 3rd |
| https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js | 382ms | 273ms | 108ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L | 313ms | 275ms | 38ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-KWRSKS | 306ms | 248ms | 30ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-FH5X1PMV8C&cx=c>m=4e64h1 | 287ms | 249ms | 36ms | 3rd |
| https://www.usgs.gov/core/misc/drupal.init.js?v=10.5.6 | 264ms | 141ms | 0ms | 3rd |
| https://touchpoints.app.cloud.gov/touchpoints/5e10f821.js | 177ms | 70ms | 52ms | 3rd |
| https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js | 158ms | 128ms | 21ms | 3rd |
| https://dap.digitalgov.gov/web-vitals/dist/web-vitals.attribution.iife.js | 96ms | 92ms | 2ms | 3rd |
Showing top 10 of 15 scripts
FJS BundlesAction87 scripts, 513 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js | 251 KB | 122 KB (49%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L&cx=c>m=4e64h1 | 147 KB | 106 KB (72%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-KWRSKS | 136 KB | 68 KB (50%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L | 147 KB | 61 KB (42%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-FH5X1PMV8C&cx=c>m=4e64h1 | 157 KB | 61 KB (39%) | ✓ | 3rd |
| https://www.usgs.gov/modules/custom/usgs_products/js/jquery.dataTables.js?v=1.0.0 | 113 KB | 57 KB (51%) | ✗ | 3rd |
| https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js | 57 KB | 37 KB (67%) | ✓ | 3rd |
| https://www.usgs.gov/core/misc/message.js?v=10.5.6 | 3 KB | — | ✓ | 3rd |
| https://www.usgs.gov/core/misc/dialog/dialog-deprecation.js?v=10.5.6 | 1 KB | — | ✓ | 3rd |
| https://www.usgs.gov/core/misc/drupal.init.js?v=10.5.6 | 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
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 InventoryAction163 resources · 2.8 MB · 513 KB savings availableFIX
~512.8 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 163 resources | 2.8 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction21 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
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 Loading10 fonts (486 KB)PASS
Web fonts
10
486 KB total
Render-blocking
0
of 10
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
- 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 ~134 KB and ~268 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 Waterfall163 requests over 5724msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 655ms | 0 KB | — | $9/mo | Costly |
www.usgs.gov www.usgs.gov | Other | 649ms | 18 KB | — | $9/mo | Costly |
jsDelivr cdn.jsdelivr.net | CDN | 382ms | 251 KB | 49% | $5/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 313ms | 147 KB | 42% | $4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 306ms | 136 KB | 50% | $4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 287ms | 157 KB | 39% | $4/mo | Costly |
www.usgs.gov www.usgs.gov | Other | 264ms | 1 KB | — | $4/mo | Costly |
touchpoints.app.cloud.gov touchpoints.app.cloud.gov | Other | 177ms | 80 KB | — | $2/mo | Optional |
Hotjar script.hotjar.com | Session Replay | 158ms | 57 KB | 67% | $2/mo | Optional |
dap.digitalgov.gov dap.digitalgov.gov | Other | 96ms | 4 KB | — | $1/mo | Optional |
www.usgs.gov www.usgs.gov | Other | 79ms | 106 KB | — | $1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 74ms | 147 KB | 72% | $1/mo | Optional |
www.usgs.gov www.usgs.gov | Other | 69ms | 30 KB | — | $1/mo | Optional |
www.usgs.gov www.usgs.gov | Other | 65ms | 113 KB | 51% | $1/mo | Optional |
dap.digitalgov.gov dap.digitalgov.gov | Other | 53ms | 9 KB | — | $1/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 655ms and costs ~$9/month
- www.usgs.gov adds 649ms and costs ~$9/month
- jsDelivr adds 382ms and costs ~$5/month
- Google Tag Manager adds 313ms and costs ~$4/month
- Google Tag Manager adds 306ms and costs ~$4/month
- Google Tag Manager adds 287ms and costs ~$4/month
- www.usgs.gov adds 264ms and costs ~$4/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
Unattributable takes 655ms 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.usgs.gov takes 649ms 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
jsDelivr takes 382ms 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
Google Tag Manager takes 313ms 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
Google Tag Manager takes 306ms 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 Google Tag Manager'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 287ms 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.usgs.gov takes 264ms 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
67% of Hotjar'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
72% of Google Tag Manager'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 www.usgs.gov'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