Performance
· 25 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.
1.10 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.98 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
134 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.000
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
1.29 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.
5.76 s
Page Load Progression
DJS Execution CostAction2358ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.james-square.com/_next/static/chunks/1255-642c76f13c20a3ec.js | 830ms | 668ms | 10ms | 1st |
| https://www.james-square.com/local | 439ms | 11ms | 6ms | 1st |
| https://www.james-square.com/_next/static/chunks/3126-35e4f73e95ec7d01.js | 407ms | 133ms | 7ms | 1st |
| Unattributable | 257ms | 7ms | 0ms | 3rd |
| https://apis.google.com/_/scs/abc-static/_/js/k=gapi.lb.en.gSqfLc8WnvU.O/m=gapi_iframes/rt=j/sv=1/d=1/ed=1/rs=AHpOoo_cXXGArE2dtw6vkGR2NQ_1f5L3AQ/cb=gapi.loaded_0?le=scs | 139ms | 117ms | 18ms | 3rd |
| https://www.james-square.com/_next/static/chunks/1356-55692d5ef6a323df.js | 128ms | 127ms | 1ms | 1st |
| https://www.james-square.com/_next/static/chunks/4bd1b696-100b9d70ed4e49c1.js | 106ms | 60ms | 11ms | 1st |
| https://www.james-square.com/_next/static/chunks/7c86ec74-de51e9d7b9a8da4c.js | 52ms | 40ms | 6ms | 1st |
BJS Bundles19 scripts, 100 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.james-square.com/_next/static/chunks/bc9e92e6-2e4aea27b2dc598b.js | 55 KB | 51 KB (93%) | ✓ | 1st |
| https://www.james-square.com/_next/static/chunks/9736-4c65d643a866cd4b.js | 37 KB | 28 KB (75%) | ✓ | 1st |
| https://www.james-square.com/_next/static/chunks/3126-35e4f73e95ec7d01.js | 39 KB | 22 KB (56%) | ✓ | 1st |
| https://www.james-square.com/_next/static/chunks/2619-04bc32f026a0d946.js | 4 KB | — | ✓ | 1st |
| https://www.james-square.com/_next/static/chunks/4bd1b696-100b9d70ed4e49c1.js | 55 KB | — | ✓ | 1st |
| https://www.james-square.com/_next/static/chunks/7c86ec74-de51e9d7b9a8da4c.js | 27 KB | — | ✓ | 1st |
| https://www.james-square.com/_next/static/chunks/1255-642c76f13c20a3ec.js | 45 KB | — | ✓ | 1st |
| https://www.james-square.com/_next/static/chunks/3798-6139ada3d8eae630.js | 1 KB | — | ✓ | 1st |
| https://www.james-square.com/_next/static/chunks/webpack-19608383b5a502a9.js | 2 KB | — | ✓ | 1st |
| https://www.james-square.com/_next/static/chunks/1356-55692d5ef6a323df.js | 5 KB | — | ✓ | 1st |
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
BHTTP/3 (QUIC)HTTP/3 not advertisedREVIEW
CCompression AlgorithmActionMain response served uncompressedREVIEW
BServer-Timing ObservabilityNo Server-Timing header foundREVIEW
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 |
APage Weight Budget996 KB transferred, 41 requestsPASS
A+Third-Party Impact13% third-party, 0 ms blockingPASS
A+Text CompressionAll text resources are compressedPASS
AImage Optimization9 images, 0 KB saveablePASS
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
A+Font Loading2 fonts (59 KB)PASS
Web fonts
2
59 KB total
Render-blocking
0
of 2
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
A+LCP Image PreloadLCP preload audit not availablePASS
A+Main HTML Cache-ControlMain HTML max-age=0 (≤ 5min) is appropriatePASS
A+Server Response Intelligence2 server-response signal(s) detectedPASS
A+Page Weight Inventory41 resources · 996 KB · 100 KB savings availablePASS
~100.5 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 41 resources | 995.8 KiB | ||||||
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
A+JavaScript BlockingNo render-blocking JS or document.write usage detectedPASS
A+CSS Performance DepthNo CSS performance depth issues detectedPASS
Network Waterfall41 requests over 2091msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 257ms | 0 KB | — | $3/mo | Costly |
apis.google.com apis.google.com | Other | 139ms | 34 KB | — | $2/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 257ms and costs ~$3/month
Unattributable takes 257ms 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