Performance

· 22 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

SEO

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

530 ms

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

1.16 s

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.

0.013

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

679 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.

1.16 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

15 PASS 4 REVIEW

JS Execution Cost

659ms total JS execution

REVIEW

659ms total JS execution

https://potentialspouse.com/: 293ms CPU time

Unattributable: 237ms CPU time

https://potentialspouse.com/assets/js/app-951f5aee...: 130ms CPU time

Third-party scripts: 237ms (36% of total)

Main Thread Breakdown

Other 53% Style & Layout 24% Script Evaluation 15% Rendering 3%

Script	Total	Scripting	Parse/Compile	Party
https://potentialspouse.com/	293ms	7ms	1ms	1st
Unattributable	237ms	3ms	0ms	3rd
https://potentialspouse.com/assets/js/app-951f5aee9ee457c69be2db0793700ac0.js?vsn=d	130ms	87ms	10ms	1st

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.

HTTP Caching

max-age=0, private, must-revalidate

REVIEW

max-age=0, private, must-revalidate

Cache-Control header is set

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

No ETag or Last-Modified header

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

Cache-Control

max-age=0, private, must-revalidate

Directive	Value	Meaning
max-age	0	Cache for 0 seconds
private	—	Only browser cache, not CDN/proxy
must-revalidate	—	Must recheck with server after expiry

Page Weight Budget

828 KB transferred, 18 requests

PASS

828 KB transferred, 18 requests

Page weighs 1.1 MB (828 KB transferred)

18 HTTP requests

Estimated 0.17 g CO2 per page load

828 KB transferred

18 requests

0.17 g CO2 per page load

Images 641.6 KiB 77%

Fonts 85.5 KiB 10%

JavaScript 47.8 KiB 6%

CSS 40.6 KiB 5%

HTML 11.0 KiB 1%

Other 953 B 0%

Other 864 B 0%

0 2.4 MB 4.9 MB

Under budget

A+

Third-Party Impact

No third-party resources

PASS

No third-party resources

No third-party resources detected

No third-party resources detected — all resources are first-party.

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

A+

Image Optimization

3 images, 0 KB saveable

PASS

3 images, 0 KB saveable

All images are well-optimized

3 images 642 KB

0 oversized -0 KB

1 legacy format

0 missing dimensions CLS risk

A+

Font Loading

4 fonts (86 KB)

PASS

4 fonts (86 KB)

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

Web fonts

86 KB total

Render-blocking

of 4

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

space-grotesk-bold-04a0... woff2 swap

Size 13 KB

Load time 23 ms

Start 201 ms

Risk FOUT — text flashes from fallback to web font

inter-medium-42b9543077... woff2 swap

Size 24 KB

Load time 26 ms

Start 201 ms

Risk FOUT — text flashes from fallback to web font

inter-semibold-75fb76ec... woff2 swap

Size 24 KB

Load time 23 ms

Start 201 ms

Risk FOUT — text flashes from fallback to web font

inter-regular-f837d382a... woff2 swap

Size 24 KB

Load time 24 ms

Start 203 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

1 scripts, 30 KB unused

PASS

1 scripts, 30 KB unused

https://potentialspouse.com/assets/js/app-951f5aee...: 30 KB unused (64%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 30 KB

30 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://potentialspouse.com/assets/js/app-951f5aee9ee457c69be2db0793700ac0.js?vsn=d	48 KB	30 KB (64%)	✓	1st

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+

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: max-age=0, private, must-revalidate

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.

A+

Page Weight Inventory

18 resources · 828 KB · 30 KB savings available

PASS

18 resources · 828 KB · 30 KB savings available

Within 1MB page-weight target

Got: 828 KB

7 third-party resources (0% of weight)

1 resources over 200KB

18 resources · 828.3 KiB · 7 third-party Within 1MB page-weight target

Image 78% · 642.6 KiB

Font 10% · 85.5 KiB

JavaScript 6% · 47.8 KiB

CSS 5% · 40.6 KiB

Document 1% · 11.0 KiB

Other 0% · 864 B

~30.1 KiB of savings available

Remove unused JavaScript: 30.1 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

18 resources			828.3 KiB

A+

Green Hosting

Whether the site is served from green-energy infrastructure

PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall

18 requests over 618ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Third-Party Script Cost

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

INFO

36% of JavaScript execution is third-party

First-party Third-party 237ms · 0KB · €3/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
Unattributable Unattributable	Other	237ms	0 KB	—	€3/mo	Costly

Unattributable

Other

Costly

Execution 237ms

Transfer 0 KB

Monthly Cost €3/mo

These scripts may cost more than they're worth

Unattributable adds 237ms and costs ~€3/month

Unattributable takes 237ms 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

Image Optimization

1 images, 641 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

641 KB

1 missing alt text

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

Browse & Analyze

Learn

Performance

Page Load Progression

Font loading timeline

Optimization checklist

Green Hosting

These scripts may cost more than they're worth

Image Optimization Audit