Performance

· 15 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.

1.35 s

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

1.39 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.

0.111

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

1.35 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.

1.39 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

8 PASS 4 REVIEW 1 FIX

Third-Party Impact

Action

69% third-party, 0 ms blocking

FIX

69% third-party, 0 ms blocking

Third-party code accounts for 69% of page weight (563.8 KiB of 819.6 KiB)

Third-party blocking time is low (0 ms)

31%

69%

First-party Third-party

Image Optimization

36 images, 0 KB saveable

REVIEW

36 images, 0 KB saveable

All images are well-optimized

36 images 253 KB

0 oversized -0 KB

36 legacy format

0 missing dimensions CLS risk

JS Bundles

28 scripts, 53 KB unused

REVIEW

28 scripts, 53 KB unused

https://d1qwl4ymp6qhug.cloudfront.net/Release/R101...: 33 KB unused (88%)

Consider code splitting or tree shaking to reduce unused code.

https://d1qwl4ymp6qhug.cloudfront.net/Release/R101...: 20 KB unused (95%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 53 KB

53 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://d1qwl4ymp6qhug.cloudfront.net/Release/R10188/6854-bundle.js	38 KB	33 KB (88%)	✓	3rd
https://d1qwl4ymp6qhug.cloudfront.net/Release/R10188/4286-bundle.js	22 KB	20 KB (95%)	✓	3rd
https://d1qwl4ymp6qhug.cloudfront.net/Release/R10188/2531-bundle.js	12 KB	—	✓	3rd
https://d1qwl4ymp6qhug.cloudfront.net/Release/R10188/2097-bundle.js	1 KB	—	✓	3rd
https://d1qwl4ymp6qhug.cloudfront.net/Release/R10188/3567-bundle.js	25 KB	—	✓	3rd
https://d1qwl4ymp6qhug.cloudfront.net/Release/R10188/2810-bundle.js	4 KB	—	✓	3rd
https://d1qwl4ymp6qhug.cloudfront.net/Release/R10188/8417-bundle.js	6 KB	—	✓	3rd
https://d1qwl4ymp6qhug.cloudfront.net/Release/R10188/1357-bundle.js	5 KB	—	✓	3rd
https://d1qwl4ymp6qhug.cloudfront.net/Release/R10188/9436-bundle.js	10 KB	—	✓	3rd
https://d1qwl4ymp6qhug.cloudfront.net/Release/R10188/4829-bundle.js	6 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

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

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

HTTP Caching

private

REVIEW

private

Cache-Control header is set

Got: private

No ETag or Last-Modified header

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

Cache-Control

private

Directive	Value	Meaning
private	—	Only browser cache, not CDN/proxy

Page Weight Budget

820 KB transferred, 82 requests

PASS

820 KB transferred, 82 requests

Page weighs 1.4 MB (820 KB transferred)

82 HTTP requests

Estimated 0.17 g CO2 per page load

820 KB transferred

82 requests

0.17 g CO2 per page load

HTML 254.4 KiB 31%

Images 252.8 KiB 31%

JavaScript 225.8 KiB 28%

Fonts 48.5 KiB 6%

CSS 36.3 KiB 4%

Other 1.5 KiB 0%

Other 325 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+

JS Execution Cost

290ms total JS execution

PASS

290ms total JS execution

https://flippingbook.com/: 161ms CPU time

Unattributable: 128ms CPU time

Third-party scripts: 128ms (44% of total)

Main Thread Breakdown

Other 38% Script Evaluation 25% Style & Layout 23% Parse HTML & CSS 5% Script Parsing & Compilation 5% Rendering 4%

Script	Total	Scripting	Parse/Compile	Party
https://flippingbook.com/	161ms	11ms	1ms	1st
Unattributable	128ms	2ms	0ms	3rd

A+

Font Loading

2 fonts (49 KB)

PASS

2 fonts (49 KB)

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

Web fonts

49 KB total

Render-blocking

of 2

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

KFO7CnqEu92Fr1ME7kSn66a... woff2 swap

Size 37 KB

Load time 43 ms

Start 569 ms

Risk FOUT — text flashes from fallback to web font

Qw3PZQNVED7rKGKxtqIqX5E... woff2 swap

Size 12 KB

Load time 42 ms

Start 570 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+

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

Page Weight Inventory

82 resources · 820 KB · 53 KB savings available

PASS

82 resources · 820 KB · 53 KB savings available

Within 1MB page-weight target

Got: 820 KB

~53 KB of savings available

80 third-party resources (69% of weight)

1 resources over 200KB

82 resources · 819.6 KiB · 80 third-party Within 1MB page-weight target

Document 31% · 254.4 KiB

Image 31% · 254.2 KiB

JavaScript 28% · 225.8 KiB

Font 6% · 48.5 KiB

CSS 4% · 36.3 KiB

Other 0% · 325 B

~53.5 KiB of savings available

Remove unused JavaScript: 53.5 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

82 resources			819.6 KiB

Network Waterfall

82 requests over 1119ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Third-Party Script Cost

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

INFO

44% of JavaScript execution is third-party

First-party Third-party 128ms · 0KB · €1/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
Unattributable Unattributable	Other	128ms	0 KB	—	€1/mo	Optional

Unattributable

Other

Optional

Execution 128ms

Transfer 0 KB

Monthly Cost €1/mo

44% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

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.