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

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.

973 ms

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

1.09 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.

0.000

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

973 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.

1.10 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 5 REVIEW 1 FIX

Third-Party Impact

Action

80% third-party, 0 ms blocking

FIX

80% third-party, 0 ms blocking

Third-party code accounts for 80% of page weight (167.8 KiB of 210.4 KiB)

Third-party blocking time is low (0 ms)

20%

80%

First-party Third-party

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

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

REVIEW

Main 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, no-cache, no-transform

REVIEW

public, max-age=0, no-cache, no-transform

Cache-Control header is set

Got: public, max-age=0, no-cache, no-transform

Last-Modified header present

Cache-Control

public, max-age=0, no-cache, no-transform

Directive	Value	Meaning
public	—	Any cache may store this response
max-age	0	Cache for 0 seconds
no-cache	—	Cache but always revalidate first
no-transform	—

A+

Page Weight Budget

210 KB transferred, 17 requests

PASS

210 KB transferred, 17 requests

Page weighs 466 KB (210 KB transferred)

17 HTTP requests

Estimated 0.04 g CO2 per page load

210 KB transferred

17 requests

0.04 g CO2 per page load

Fonts 75.9 KiB 36%

JavaScript 46.0 KiB 22%

CSS 43.1 KiB 20%

Images 34.8 KiB 17%

HTML 9.4 KiB 4%

Other 1.1 KiB 1%

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

3 images, 0 KB saveable

PASS

3 images, 0 KB saveable

All images are well-optimized

3 images 35 KB

0 oversized -0 KB

1 legacy format

0 missing dimensions CLS risk

A+

JS Execution Cost

324ms total JS execution

PASS

324ms total JS execution

https://static-global.iololi.com/wp-content/themes...: 212ms CPU time

https://www.iololi.com/: 112ms CPU time

Third-party scripts: 212ms (65% of total)

Main Thread Breakdown

Other 57% Style & Layout 24% Script Evaluation 10% Rendering 5% Parse HTML & CSS 3%

Script	Total	Scripting	Parse/Compile	Party
https://static-global.iololi.com/wp-content/themes/Origami/js/mouse.js	212ms	31ms	0ms	3rd
https://www.iololi.com/	112ms	2ms	1ms	1st

A+

Font Loading

1 fonts (76 KB)

PASS

1 fonts (76 KB)

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

Web fonts

76 KB total

Render-blocking

of 1

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

fontawesome-webfont.woff2 woff2 swap

Size 76 KB

Load time 123 ms

Start 519 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)

JS Bundles

4 scripts, 0 KB unused

PASS

4 scripts, 0 KB unused

https://static-global.iololi.com/wp-content/themes...: unminified — 5 KB could be saved

0 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://static-global.iololi.com/wp-content/themes/Origami/js/qrcode.min.js	20 KB	—	✓	3rd
https://static-global.iololi.com/wp-content/themes/Origami/js/SMValidator.min.js	5 KB	—	✓	3rd
https://static-global.iololi.com/wp-content/themes/Origami/js/mouse.js	2 KB	—	✓	3rd
https://static-global.iololi.com/wp-content/themes/Origami/js/main.js	19 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+

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 uses no-cache -- safe revalidate-on-request policy

PASS

Main HTML uses no-cache -- safe revalidate-on-request policy

Got: public, max-age=0, no-cache, no-transform

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).

`Last-Modified` present -- timestamp-based conditional GET supported

Consider also setting `ETag` for stronger revalidation -- ETags are content hashes that don't suffer from clock-skew or DST issues. Last-Modified alone is functional for conditional GETs and not a bug.

Page Weight Inventory

17 resources · 210 KB · 0 KB savings available

PASS

17 resources · 210 KB · 0 KB savings available

Within 1MB page-weight target

Got: 210 KB

13 third-party resources (80% of weight)

17 resources · 210.4 KiB · 13 third-party Within 1MB page-weight target

Font 36% · 75.9 KiB

JavaScript 22% · 46.0 KiB

CSS 20% · 43.1 KiB

Image 17% · 35.4 KiB

Document 5% · 10.0 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

17 resources			210.4 KiB

Network Waterfall

17 requests over 1007ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Third-Party Script Cost

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

INFO

65% of JavaScript execution is third-party

First-party Third-party 212ms · 2KB · ¥10/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
static-global.iololi.com static-global.iololi.com	Other	212ms	2 KB	—	¥10/mo	Costly

static-global.iololi.com

Other

Costly

Execution 212ms

Transfer 2 KB

Monthly Cost ¥10/mo

These scripts may cost more than they're worth

static-global.iololi.com adds 212ms and costs ~¥10/month

65% 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

static-global.iololi.com takes 212ms 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

3 images, 32 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

32 KB

2 missing alt text 3 missing dimensions 2 missing lazy loading

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