Performance

· 25 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Performance

100

Accessibility

Best Practices

100

SEO

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

3.72 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

11.74 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

682 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.

5.07 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.

11.75 s

Page Load Progression

375 ms

750 ms

1.1 s

1.5 s

1.9 s

2.2 s

2.6 s

3.0 s

Checks

13 PASS 7 REVIEW 3 FIX

Third-Party Impact

Action

100% third-party, 0 ms blocking

FIX

100% third-party, 0 ms blocking

Third-party code accounts for 100% of page weight (1.6 MiB of 1.6 MiB)

Third-party blocking time is low (0 ms)

100%

First-party Third-party

JS Execution Cost

Action

3646ms total JS execution

FIX

3646ms total JS execution

https://www.bcwc.cloud/: 1936ms CPU time

https://www.bcwc.cloud/_next/static/chunks/255-cb3...: 1177ms CPU time

Unattributable: 332ms CPU time

https://www.bcwc.cloud/_next/static/chunks/4bd1b69...: 201ms CPU time

Third-party scripts: 3314ms (91% of total)

Main Thread Breakdown

Script Evaluation 34% Style & Layout 26% Other 25% Rendering 11%

Script	Total	Scripting	Parse/Compile	Party
https://www.bcwc.cloud/	1936ms	73ms	7ms	3rd
https://www.bcwc.cloud/_next/static/chunks/255-cb395327542b56ef.js	1177ms	1104ms	27ms	3rd
Unattributable	332ms	14ms	0ms	1st
https://www.bcwc.cloud/_next/static/chunks/4bd1b696-c023c6e3521b1417.js	201ms	59ms	31ms	3rd

Page Weight Inventory

Action

99 resources · 1.6 MB · 28 KB savings available

FIX

99 resources · 1.6 MB · 28 KB savings available

Page weight 1.6 MB exceeds 1 MB target by 615 KB

Got: 1.6 MB Expected: ≤ 1 MB

98 third-party resources (100% of weight)

99 resources · 1.6 MiB · 98 third-party 614.9 KiB over 1MB target

Other 43% · 710.8 KiB

JavaScript 27% · 440.2 KiB

Image 19% · 311.7 KiB

Font 7% · 121.2 KiB

CSS 3% · 42.6 KiB

Document 1% · 12.4 KiB

~28.3 KiB of savings available

Remove unused JavaScript: 28.3 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

99 resources			1.6 MiB

Page Weight Budget

Action

1.6 MB transferred, 99 requests

REVIEW

1.6 MB transferred, 99 requests

Page weighs 2.9 MB (1.6 MB transferred)

99 HTTP requests

Estimated 0.34 g CO2 per page load

1.6 MB transferred

99 requests

0.34 g CO2 per page load

Other 710.3 KiB 43%

JavaScript 440.2 KiB 27%

Images 311.7 KiB 19%

Fonts 121.2 KiB 7%

CSS 42.6 KiB 3%

HTML 9.8 KiB 1%

Other 2.6 KiB 0%

Other 441 B 0%

0 2.4 MB 4.9 MB

Approaching limit

Image Optimization

34 images, 0 KB saveable

REVIEW

34 images, 0 KB saveable

All images are well-optimized

34 images 312 KB

0 oversized -0 KB

6 legacy format

0 missing dimensions CLS risk

HTTP/3 (QUIC)

HTTP/3 not advertised

REVIEW

HTTP/3 not advertised

HTTP/3 (QUIC) is not advertised

HTTP/3 isn't advertised via Alt-Svc and the worker didn't negotiate h3. HTTP/3 reduces handshake latency (1-RTT instead of 2-3 RTTs) and is more resilient on lossy connections. Most modern CDNs (Cloudflare, Fastly, AWS CloudFront, Google Cloud CDN) support HTTP/3 with a single config switch -- consider enabling for mobile-heavy workloads.

Compression Algorithm

Action

Main response served uncompressed

REVIEW

Main response served uncompressed

Main HTML response has no Content-Encoding (uncompressed)

The main HTML document is served without compression. The Text Compression section above lists the broader picture; for the main response specifically, even gzip would shave ~70-80% off most text payloads.

Server-Timing Observability

No Server-Timing header found

REVIEW

No Server-Timing header found

Server-Timing exposes backend timing breakdowns to browser DevTools (e.g., `db: 45ms; render: 120ms; cache: 2ms`). Useful for diagnosing slow pages without backend log access. Most modern frameworks (Next.js, Cloudflare Workers, Fastly) emit it automatically; absence on a managed platform usually means telemetry headers are stripped at the edge.

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

HTTP Caching

public, max-age=0, must-revalidate

REVIEW

public, max-age=0, must-revalidate

Cache-Control header is set

Got: public, max-age=0, must-revalidate

No ETag or Last-Modified header

Conditional requests (304 Not Modified) are not possible without validators.

Cache-Control

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 Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

A+

Font Loading

3 fonts (121 KB)

PASS

3 fonts (121 KB)

3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

121 KB total

Render-blocking

of 3

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

36966cca54120369-s.p.woff2 woff2 swap

Size 22 KB

Load time 188 ms

Start 98 ms

Risk FOUT — text flashes from fallback to web font

bb3ef058b751a6ad-s.p.woff2 woff2 swap

Size 40 KB

Load time 146 ms

Start 99 ms

Risk FOUT — text flashes from fallback to web font

iconfont.woff woff swap

Size 59 KB

Load time 19 ms

Start 498 ms

Risk FOUT — text flashes from fallback to web font

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 Bundles

13 scripts, 28 KB unused

PASS

13 scripts, 28 KB unused

https://www.bcwc.cloud/_next/static/chunks/app/pag...: 28 KB unused (67%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 28 KB

28 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://www.bcwc.cloud/_next/static/chunks/app/page-6e043bfdb9888585.js	43 KB	28 KB (67%)	✓	3rd
https://www.bcwc.cloud/_next/static/chunks/239-e5a90e2a60ae59a5.js	6 KB	—	✓	3rd
https://embed.windy.com/v/41.1.0.emb.b79a/embed2.js	93 KB	—	✓	3rd
https://www.bcwc.cloud/_next/static/chunks/4bd1b696-c023c6e3521b1417.js	55 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/webpack-c33d034c0b492a25.js	2 KB	—	✓	3rd
https://embed.windy.com/js/leaflet140_patched_tileLayer.v17.js	140 KB	—	✓	3rd
https://www.windy.com/patch/index/latest/patch.js?refTime=2026-07-19T21:15	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.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

A+

Resource Caching

All resources properly cached

PASS

All resources properly cached

No caching issues found

All static resources have appropriate caching headers.

A+

Critical Rendering Path

No render-blocking resources

PASS

No render-blocking resources

No render-blocking resources detected

A+

Resource Hints

No optimization needed

PASS

No optimization needed

No resource hint issues

A+

LCP Image Preload

LCP preload audit not available

PASS

LCP preload audit not available

LCP image preload audit not available for this scan

A+

Main HTML Cache-Control

Main HTML max-age=0 (≤ 5min) is appropriate

PASS

Main HTML max-age=0 (≤ 5min) is appropriate

Got: public, max-age=0, must-revalidate

A+

Server Response Intelligence

1 server-response signal(s) detected

PASS

1 server-response signal(s) detected

No `ETag` or `Last-Modified` -- conditional GET not supported

Without either header, browsers can't issue conditional GETs and refresh always re-downloads the full response body even when nothing changed. Add `ETag: "<hash>"` (or `Last-Modified: <date>`) on cacheable responses; the server returns 304 Not Modified when the client's cached copy is still valid, saving bandwidth.

A+

Render-Blocking Resources

No render-blocking resources detected

PASS

No render-blocking resources detected

No render-blocking resources detected in <head>

A+

Third-Party Resources

No third-party resources detected

PASS

No third-party resources detected

JavaScript Blocking

1 JS blocking issue(s) detected

PASS

1 JS blocking issue(s) detected

Total JS execution time is 3.6 s -- over the 3.5s budget

Total JavaScript execution (parse + compile + run) across all scripts exceeds 3.5 seconds. On low-end devices that becomes 7-15+ seconds and shows up directly in TBT and INP. Reduce by: tree-shaking unused dependencies, code-splitting (dynamic `import()`), removing or deferring third-party tracking, and replacing heavy frameworks where they're not needed.

A+

CSS Performance Depth

No CSS performance depth issues detected

PASS

No CSS performance depth issues detected

Network Waterfall

99 requests over 2138ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Third-Party Script Cost

Per-script blocking time, transfer cost, and cache headers

INFO

91% of JavaScript execution is third-party

First-party Third-party 3314ms · 107KB · $44/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
www.bcwc.cloud www.bcwc.cloud	Other	1936ms	7 KB	—	$26/mo	Costly
www.bcwc.cloud www.bcwc.cloud	Other	1177ms	45 KB	—	$16/mo	Costly
www.bcwc.cloud www.bcwc.cloud	Other	201ms	55 KB	—	$3/mo	Costly

www.bcwc.cloud

Other

Costly

Execution 1936ms

Transfer 7 KB

Monthly Cost $26/mo

www.bcwc.cloud

Other

Costly

Execution 1177ms

Transfer 45 KB

Monthly Cost $16/mo

www.bcwc.cloud

Other

Costly

Execution 201ms

Transfer 55 KB

Monthly Cost $3/mo

These scripts may cost more than they're worth

www.bcwc.cloud adds 1936ms and costs ~$26/month
www.bcwc.cloud adds 1177ms and costs ~$16/month
www.bcwc.cloud adds 201ms and costs ~$3/month

91% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

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 1936ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

www.bcwc.cloud takes 1177ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

www.bcwc.cloud takes 201ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.