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.
3.64 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
6.01 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
172 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.
6.30 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.
38.59 s
Page Load Progression
FPage Weight BudgetAction6.8 MB transferred, 98 requestsFIX
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction4813ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.bcwc.cloud/ | 2705ms | 6ms | 8ms | 3rd |
| Unattributable | 1137ms | 9ms | 0ms | 1st |
| https://www.bcwc.cloud/_next/static/chunks/255-cb395327542b56ef.js | 550ms | 458ms | 20ms | 3rd |
| https://www.bcwc.cloud/_next/static/chunks/4bd1b696-c023c6e3521b1417.js | 336ms | 216ms | 20ms | 3rd |
| https://www.bcwc.cloud/_next/static/chunks/app/page-33dc4cff21eadb0a.js | 86ms | 52ms | 33ms | 3rd |
DPage Weight InventoryAction98 resources · 6.8 MB · 28 KB savings availableFIX
~28.3 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 98 resources | 6.8 MiB | ||||||
BImage Optimization33 images, 0 KB saveableREVIEW
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 |
A+Text CompressionAll text resources are compressedPASS
A+Font Loading3 fonts (121 KB)PASS
Web fonts
3
121 KB total
Render-blocking
0
of 3
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Convert to woff2 for ~30% smaller file size
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 ~18 KB and ~36 ms
A+JS Bundles13 scripts, 28 KB unusedPASS
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.bcwc.cloud/_next/static/chunks/app/page-33dc4cff21eadb0a.js | 43 KB | 28 KB (67%) | ✓ | 3rd |
| https://embed.windy.com/js/leaflet140_patched_tileLayer.v17.js | 140 KB | — | ✓ | 3rd |
| https://www.bcwc.cloud/_next/static/chunks/255-cb395327542b56ef.js | 45 KB | — | ✓ | 3rd |
| https://www.bcwc.cloud/_next/static/chunks/main-app-f9b5d20365cb8be2.js | 1 KB | — | ✓ | 3rd |
| https://www.bcwc.cloud/_next/static/chunks/239-e5a90e2a60ae59a5.js | 6 KB | — | ✓ | 3rd |
| https://www.bcwc.cloud/_next/static/chunks/4bd1b696-c023c6e3521b1417.js | 55 KB | — | ✓ | 3rd |
| https://www.bcwc.cloud/_next/static/chunks/webpack-e6b6db5b5a49c310.js | 2 KB | — | ✓ | 3rd |
| https://embed.windy.com/v/41.1.0.emb.b79a/embed2.js | 93 KB | — | ✓ | 3rd |
| https://www.windy.com/patch/index/latest/patch.js?refTime=2026-07-19T21:37 | 4 KB | — | ✓ | 3rd |
| https://embed.windy.com/v/41.1.0.emb.b79a/plugins/gl-lib.js | 15 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
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 Intelligence1 server-response signal(s) detectedPASS
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
AJavaScript Blocking1 JS blocking issue(s) detectedPASS
A+CSS Performance DepthNo CSS performance depth issues detectedPASS
Network Waterfall98 requests over 2444msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.bcwc.cloud www.bcwc.cloud | Other | 2705ms | 9 KB | — | $36/mo | Costly |
www.bcwc.cloud www.bcwc.cloud | Other | 550ms | 45 KB | — | $7/mo | Costly |
www.bcwc.cloud www.bcwc.cloud | Other | 336ms | 55 KB | — | $4/mo | Costly |
www.bcwc.cloud www.bcwc.cloud | Other | 86ms | 43 KB | 67% | $1/mo | Optional |
These scripts may cost more than they're worth
- www.bcwc.cloud adds 2705ms and costs ~$36/month
- www.bcwc.cloud adds 550ms and costs ~$7/month
- www.bcwc.cloud adds 336ms and costs ~$4/month
76% 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.bcwc.cloud takes 2705ms 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.bcwc.cloud takes 550ms 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.bcwc.cloud takes 336ms 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 www.bcwc.cloud'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