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.
2.99 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
8.88 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
254 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.001
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
3.39 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.
9.06 s
Page Load Progression
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
BPage Weight Budget1.2 MB transferred, 101 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
CJS Execution CostAction1927ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.scotusblog.com/_next/static/chunks/9dc88527b93ac6dc.js?dpl=dpl_3U9UeduiKSNnrKv8aABL44eq75tz | 572ms | 501ms | 15ms | 3rd |
| https://cdn.tinypass.com/api/tinypass.min.js | 322ms | 264ms | 33ms | 3rd |
| Unattributable | 298ms | 34ms | 0ms | 3rd |
| https://www.scotusblog.com/ | 258ms | 10ms | 28ms | 3rd |
| https://www.scotusblog.com/_next/static/chunks/777480f98c775904.js?dpl=dpl_3U9UeduiKSNnrKv8aABL44eq75tz | 230ms | 131ms | 9ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-J1WT1Z8MXT | 171ms | 137ms | 33ms | 3rd |
| https://cdn.parsely.com/keys/scotusblog.com/p.js | 77ms | 69ms | 3ms | 3rd |
CJS BundlesAction28 scripts, 218 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://cdn.tinypass.com/api/tinypass.min.js | 133 KB | 83 KB (63%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-J1WT1Z8MXT | 144 KB | 63 KB (43%) | ✓ | 3rd |
| https://www.scotusblog.com/_next/static/chunks/0536a5fa2645bbb6.js?dpl=dpl_3U9UeduiKSNnrKv8aABL44eq75tz | 30 KB | 30 KB (100%) | ✓ | 3rd |
| https://www.scotusblog.com/_next/static/chunks/9dc88527b93ac6dc.js?dpl=dpl_3U9UeduiKSNnrKv8aABL44eq75tz | 70 KB | 21 KB (31%) | ✓ | 3rd |
| https://www.scotusblog.com/_next/static/chunks/1d2f96c7c16d2616.js?dpl=dpl_3U9UeduiKSNnrKv8aABL44eq75tz | 24 KB | 21 KB (88%) | ✓ | 3rd |
| https://www.scotusblog.com/_next/static/chunks/bb666de8eadadf58.js?dpl=dpl_3U9UeduiKSNnrKv8aABL44eq75tz | 3 KB | — | ✓ | 3rd |
| https://www.scotusblog.com/_next/static/chunks/35a7ae7d77639031.js?dpl=dpl_3U9UeduiKSNnrKv8aABL44eq75tz | 8 KB | — | ✓ | 3rd |
| https://www.scotusblog.com/_next/static/chunks/54a3ebeaa7b411a9.js?dpl=dpl_3U9UeduiKSNnrKv8aABL44eq75tz | 15 KB | — | ✓ | 3rd |
| https://www.scotusblog.com/_next/static/chunks/turbopack-ae7ea46057aa5635.js?dpl=dpl_3U9UeduiKSNnrKv8aABL44eq75tz | 5 KB | — | ✓ | 3rd |
| https://www.scotusblog.com/_next/static/chunks/247aa2cc1dae3564.js?dpl=dpl_3U9UeduiKSNnrKv8aABL44eq75tz | 11 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
BPage Weight Inventory101 resources · 1.2 MB · 218 KB savings availableREVIEW
~217.5 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 101 resources | 1.2 MiB | ||||||
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
BHTTP Cachingpublic, max-age=0, must-revalidateREVIEW
public, max-age=0, must-revalidate
| Directive | Value | Meaning |
|---|---|---|
| public | — | Any cache may store this response |
| max-age | 0 | Cache for 0 seconds |
| must-revalidate | — | Must recheck with server after expiry |
A+Text CompressionAll text resources are compressedPASS
AImage Optimization6 images, 0 KB saveablePASS
A+Font Loading7 fonts (316 KB)PASS
Web fonts
7
316 KB total
Render-blocking
0
of 7
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 Hints11 hints, 0 missing preconnectsPASS
Current Resource Hints
11 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall101 requests over 3890msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.scotusblog.com www.scotusblog.com | Other | 572ms | 70 KB | 31% | €6/mo | Costly |
cdn.tinypass.com cdn.tinypass.com | Other | 322ms | 133 KB | 63% | €4/mo | Costly |
Unattributable Unattributable | Other | 298ms | 0 KB | — | €3/mo | Costly |
www.scotusblog.com www.scotusblog.com | Other | 258ms | 22 KB | — | €3/mo | Costly |
www.scotusblog.com www.scotusblog.com | Other | 230ms | 23 KB | — | €2/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 171ms | 144 KB | 43% | €2/mo | Optional |
cdn.parsely.com cdn.parsely.com | Other | 77ms | 18 KB | — | €1/mo | Optional |
These scripts may cost more than they're worth
- www.scotusblog.com adds 572ms and costs ~€6/month
- cdn.tinypass.com adds 322ms and costs ~€4/month
- Unattributable adds 298ms and costs ~€3/month
- www.scotusblog.com adds 258ms and costs ~€3/month
- www.scotusblog.com adds 230ms and costs ~€2/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.scotusblog.com takes 572ms 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
cdn.tinypass.com takes 322ms 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
63% of cdn.tinypass.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
Unattributable takes 298ms 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.scotusblog.com takes 258ms 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.scotusblog.com takes 230ms 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