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.
1.16 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.00 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
8 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.002
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
1.19 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.
2.17 s
Page Load Progression
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DPage Weight InventoryAction193 resources · 1.5 MB · 218 KB savings availableFIX
~218.3 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 193 resources | 1.5 MiB | ||||||
BPage Weight Budget1.5 MB transferred, 193 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
BJS Execution Cost614ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.scotusblog.com/_next/static/chunks/9dc88527b93ac6dc.js?dpl=dpl_3U9UeduiKSNnrKv8aABL44eq75tz | 168ms | 147ms | 4ms | 3rd |
| https://www.scotusblog.com/_next/static/chunks/777480f98c775904.js?dpl=dpl_3U9UeduiKSNnrKv8aABL44eq75tz | 142ms | 80ms | 2ms | 3rd |
| Unattributable | 128ms | 21ms | 0ms | 3rd |
| https://cdn.tinypass.com/api/tinypass.min.js | 102ms | 80ms | 14ms | 3rd |
| https://www.scotusblog.com/ | 75ms | 3ms | 7ms | 3rd |
CJS BundlesAction32 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 (44%) | ✓ | 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/turbopack-ae7ea46057aa5635.js?dpl=dpl_3U9UeduiKSNnrKv8aABL44eq75tz | 5 KB | — | ✓ | 3rd |
| https://www.scotusblog.com/_next/static/chunks/ef273cb1ebe0ba81.js?dpl=dpl_3U9UeduiKSNnrKv8aABL44eq75tz | 9 KB | — | ✓ | 3rd |
| https://www.scotusblog.com/_next/static/chunks/54a3ebeaa7b411a9.js?dpl=dpl_3U9UeduiKSNnrKv8aABL44eq75tz | 16 KB | — | ✓ | 3rd |
| https://www.scotusblog.com/_next/static/chunks/236f7e5abd6f09ff.js?dpl=dpl_3U9UeduiKSNnrKv8aABL44eq75tz | 8 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
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 Optimization13 images, 0 KB saveablePASS
A+Font Loading7 fonts (315 KB)PASS
Web fonts
7
315 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 HintsNo optimization neededPASS
Network Waterfall193 requests over 4232msINFO
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 | 168ms | 70 KB | 31% | €2/mo | Optional |
www.scotusblog.com www.scotusblog.com | Other | 142ms | 23 KB | — | €2/mo | Optional |
Unattributable Unattributable | Other | 128ms | 0 KB | — | €1/mo | Optional |
cdn.tinypass.com cdn.tinypass.com | Other | 102ms | 133 KB | 63% | €1/mo | Optional |
www.scotusblog.com www.scotusblog.com | Other | 75ms | 22 KB | — | €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
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