Performance

· 21 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

Mobile Desktop

Performance

Accessibility

100

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.

937 ms

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

937 ms

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

0 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.021

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

937 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

937 ms

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

14 PASS 4 REVIEW 1 FIX

Third-Party Impact

Action

89% third-party, 0 ms blocking

FIX

89% third-party, 0 ms blocking

Third-party code accounts for 89% of page weight (172.9 KiB of 193.6 KiB)

Third-party blocking time is low (0 ms)

89%

First-party Third-party

Document Compression

Document response uses gzip; brotli would be ~20% smaller

REVIEW

Document response uses gzip; brotli would be ~20% smaller

Main HTML response uses gzip (brotli would be ~20% smaller)

All current browsers support brotli. Most CDNs (Cloudflare, Fastly, AWS CloudFront, Vercel, Netlify) can switch from gzip to brotli with a single config flag. Origin servers (nginx, Apache) need a brotli module compiled in -- nginx-brotli or Apache mod_brotli.

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, s-maxage=7200

REVIEW

public, max-age=0, s-maxage=7200

Cache-Control header is set

Got: public, max-age=0, s-maxage=7200

CDN TTL: 2 hours (s-maxage=7200)

No ETag or Last-Modified header

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

Cache-Control

public, max-age=0, s-maxage=7200

Directive	Value	Meaning
public	—	Any cache may store this response
max-age	0	Cache for 0 seconds
s-maxage	7200	CDN caches for 2 hours

A+

Page Weight Budget

194 KB transferred, 8 requests

PASS

194 KB transferred, 8 requests

Page weighs 594 KB (194 KB transferred)

8 HTTP requests

Estimated 0.04 g CO2 per page load

194 KB transferred

8 requests

0.04 g CO2 per page load

JavaScript 125.7 KiB 65%

Fonts 47.3 KiB 24%

HTML 14.0 KiB 7%

CSS 5.8 KiB 3%

Other 839 B 0%

0 2.4 MB 4.9 MB

Under budget

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

A+

Image Optimization

No images on this page

PASS

No images on this page

0 images 0 KB

0 oversized -0 KB

0 legacy format

0 missing dimensions CLS risk

A+

JS Execution Cost

312ms total JS execution

PASS

312ms total JS execution

https://www.vcsift.com/: 254ms CPU time

https://www.vcsift.com/wp-content/themes/vcsift/as...: 59ms CPU time

Main Thread Breakdown

Script Evaluation 48% Style & Layout 27% Other 11% Garbage Collection 4% Rendering 3% Parse HTML & CSS 3%

Script	Total	Scripting	Parse/Compile	Party
https://www.vcsift.com/	254ms	109ms	1ms	1st
https://www.vcsift.com/wp-content/themes/vcsift/assets/js/main.js?ver=1.0.0	59ms	49ms	0ms	1st

A+

Font Loading

1 fonts (47 KB)

PASS

1 fonts (47 KB)

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

Web fonts

47 KB total

Render-blocking

of 1

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

UcC73FwrK3iLTeHuS_nVMrM... woff2 swap

Size 47 KB

Load time 40 ms

Start 884 ms

Risk FOUT — text flashes from fallback to web font

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+

JS Bundles

2 scripts, 0 KB unused

PASS

2 scripts, 0 KB unused

0 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://www.vcsift.com/wp-content/themes/vcsift/assets/js/main.js?ver=1.0.0	2 KB	—	✓	1st
https://cdn.tailwindcss.com/3.4.17	124 KB	—	✓	3rd

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+

HTTP/3 (QUIC)

HTTP/3 advertised via Alt-Svc

PASS

HTTP/3 advertised via Alt-Svc

HTTP/3 (QUIC) is supported

First-load mobile users on cellular networks see meaningful latency improvements with HTTP/3. The QUIC transport collapses TLS + TCP handshakes into one and recovers faster from packet loss.

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, s-maxage=7200

A+

Server Response Intelligence

2 server-response signal(s) detected

PASS

2 server-response signal(s) detected

`Vary` header declared: Accept-Encoding

The page declares a `Vary` header, telling downstream caches which request headers the response varies on. Critical for content-negotiated responses (compression, language, cookies, device class).

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.

Page Weight Inventory

8 resources · 194 KB · 0 KB savings available

PASS

8 resources · 194 KB · 0 KB savings available

Within 1MB page-weight target

Got: 194 KB

4 third-party resources (89% of weight)

8 resources · 193.6 KiB · 4 third-party Within 1MB page-weight target

JavaScript 65% · 125.7 KiB

Font 24% · 47.3 KiB

Document 7% · 14.0 KiB

CSS 3% · 5.8 KiB

Other 0% · 472 B

Image 0% · 367 B

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

8 resources			193.6 KiB

Asset Compression

No text asset hosts to measure

INFO

No text asset hosts to measure

No third-party or subdomain host served enough text assets to measure

Asset compression is measured per host, from one HEAD request against a sampled resource. Pages that serve all their JS and CSS from the document's own origin are covered by the document compression check instead.

Network Waterfall

8 requests over 1054ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

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