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.
737 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.60 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
20 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.003
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
945 ms
Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.
3.33 s
Page Load Progression
FPage Weight BudgetAction3.6 MB transferred, 115 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 BundlesAction43 scripts, 724 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L&cx=c>m=4e64h1 | 147 KB | 106 KB (72%) | ✓ | 3rd |
| https://maps.googleapis.com/maps/api/js?key=AIzaSyAOqwLK442_q7mNhlwr0uPFTxm7rg726a0&libraries=places | 179 KB | 99 KB (55%) | ✓ | 3rd |
| https://www.browsealoud.com/modules/3.11.0/4230.c222ded98d9c6a4219ab.js | 82 KB | 70 KB (85%) | ✓ | 3rd |
| https://www.uscourts.gov/sites/default/files/js/js_4IeZh9lgoJSjXlTsiHVs0ZjMR-afO22C9yVDF0o3cQM.js?scope=footer&delta=0&language=en&theme=uscgov&include=eJx1kOFuwzAIhF8orh_JojZ1UQhEBq_L289Z2kntlH-c-HTHkbVhzLqsKihul2656lcIWXvzcCMp2MKVNc9TPkEL2uy6BkNo-X6K3RGG1-l6bbRA28KC0g-otL4CX6C77jyj44TfziTza_eUU1WtjMkbiDG4tljIMgMtI9HI8UEFEzA2jyTk00hNvxXTUTE-HUCAN6ds_4nxA3BSSW8H7VgFHs6EFo9pm45SsbJegV-q26PsvjcsQ6bPxBEAJfzJkIv8AEjPojw | 102 KB | 70 KB (69%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-83ZBSG354S&cx=c>m=4e64h1 | 151 KB | 64 KB (43%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L | 147 KB | 61 KB (42%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-KHXCKX8P | 134 KB | 61 KB (46%) | ✓ | 3rd |
| https://www.uscourts.gov/sites/default/files/js/js_0s-AviPvXBpDOIvXX7kzsmnu2UA_PrrUbvAXkUFp0KQ.js?scope=footer&delta=2&language=en&theme=uscgov&include=eJx1kOFuwzAIhF8orh_JojZ1UQhEBq_L289Z2kntlH-c-HTHkbVhzLqsKihul2656lcIWXvzcCMp2MKVNc9TPkEL2uy6BkNo-X6K3RGG1-l6bbRA28KC0g-otL4CX6C77jyj44TfziTza_eUU1WtjMkbiDG4tljIMgMtI9HI8UEFEzA2jyTk00hNvxXTUTE-HUCAN6ds_4nxA3BSSW8H7VgFHs6EFo9pm45SsbJegV-q26PsvjcsQ6bPxBEAJfzJkIv8AEjPojw | 61 KB | 46 KB (76%) | ✓ | 3rd |
| https://www.browsealoud.com/modules/3.11.0/6514.ac3cda7a458b82b8b52f.js | 103 KB | 40 KB (39%) | ✓ | 3rd |
| https://script.crazyegg.com/pages/versioned/common-scripts/4ce8c7df8d425cc50464576824ed91eb.js | 55 KB | 29 KB (52%) | ✓ | 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 InventoryAction115 resources · 3.6 MB · 724 KB savings availableFIX
~723.9 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 115 resources | 3.6 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization29 images, 0 KB saveableREVIEW
BJS Execution Cost529ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.uscourts.gov/ | 142ms | 1ms | 0ms | 3rd |
| Unattributable | 116ms | 3ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-83ZBSG354S&cx=c>m=4e64h1 | 81ms | 70ms | 10ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L | 76ms | 68ms | 8ms | 3rd |
| https://script.crazyegg.com/pages/versioned/common-scripts/4ce8c7df8d425cc50464576824ed91eb.js | 63ms | 55ms | 3ms | 3rd |
| https://www.uscourts.gov/sites/default/files/js/js_4IeZh9lgoJSjXlTsiHVs0ZjMR-afO22C9yVDF0o3cQM.js?scope=footer&delta=0&language=en&theme=uscgov&include=eJx1kOFuwzAIhF8orh_JojZ1UQhEBq_L289Z2kntlH-c-HTHkbVhzLqsKihul2656lcIWXvzcCMp2MKVNc9TPkEL2uy6BkNo-X6K3RGG1-l6bbRA28KC0g-otL4CX6C77jyj44TfziTza_eUU1WtjMkbiDG4tljIMgMtI9HI8UEFEzA2jyTk00hNvxXTUTE-HUCAN6ds_4nxA3BSSW8H7VgFHs6EFo9pm45SsbJegV-q26PsvjcsQ6bPxBEAJfzJkIv8AEjPojw | 52ms | 36ms | 12ms | 3rd |
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 (235 KB)PASS
Web fonts
9
235 KB total
Render-blocking
0
of 9
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 HintsNo optimization neededPASS
Network Waterfall115 requests over 2062msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.uscourts.gov www.uscourts.gov | Other | 142ms | 26 KB | — | $2/mo | Optional |
Unattributable Unattributable | Other | 116ms | 0 KB | — | $2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 81ms | 151 KB | 43% | $1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 76ms | 147 KB | 42% | $1/mo | Optional |
script.crazyegg.com script.crazyegg.com | Other | 63ms | 55 KB | 52% | $1/mo | Optional |
www.uscourts.gov www.uscourts.gov | Other | 52ms | 102 KB | 69% | $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
52% of script.crazyegg.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
69% of www.uscourts.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