Performance

· 26 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.

2.42 s

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

2.42 s

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

24 ms

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

0.157

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

3.02 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.

4.12 s

Page Load Progression

484 ms

967 ms

1.5 s

1.9 s

2.4 s

2.9 s

3.4 s

3.9 s

Checks

14 PASS 8 REVIEW 1 FIX

JS Bundles

Action

8 scripts, 161 KB unused

FIX

8 scripts, 161 KB unused

https://dailychanges.domaintools.com/js/lib/d3/d3....: 119 KB unused (83%)

Consider code splitting or tree shaking to reduce unused code.

https://dailychanges.domaintools.com/js/lib/jquery...: 43 KB unused (47%)

Consider code splitting or tree shaking to reduce unused code.

https://dailychanges.domaintools.com/js/lib/d3/d3....: unminified — 5 KB could be saved

Total unused JavaScript: 161 KB

161 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://dailychanges.domaintools.com/js/lib/d3/d3.v3.min.js	143 KB	119 KB (83%)	✓	1st
https://dailychanges.domaintools.com/js/lib/jquery/1.8.3/jquery.min.js	92 KB	43 KB (47%)	✓	1st
https://dailychanges.domaintools.com/js/most-active.js	1 KB	—	✓	1st
https://dailychanges.domaintools.com/js/lib/d3/d3.wrapper.js	11 KB	—	✗	1st
https://dailychanges.domaintools.com/js/lib/d3/d3.util.js	2 KB	—	✓	1st
https://dailychanges.domaintools.com/js/charts/summary.js	6 KB	—	✓	1st
https://dailychanges.domaintools.com/js/dailyChanges.js	1 KB	—	✓	1st
https://ssl.google-analytics.com/ga.js	17 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

Image Optimization

20 images, 0 KB saveable

REVIEW

20 images, 0 KB saveable

All images are well-optimized

20 images 51 KB

0 oversized -0 KB

20 legacy format

0 missing dimensions CLS risk

JS Execution Cost

741ms total JS execution

REVIEW

741ms total JS execution

https://dailychanges.domaintools.com/: 271ms CPU time

Unattributable: 231ms CPU time

https://dailychanges.domaintools.com/js/lib/jquery...: 152ms CPU time

https://ssl.google-analytics.com/ga.js: 87ms CPU time

Third-party scripts: 87ms (12% of total)

Main Thread Breakdown

Other 37% Script Evaluation 28% Style & Layout 14% Parse HTML & CSS 12% Rendering 5% Script Parsing & Compilation 3%

Script	Total	Scripting	Parse/Compile	Party
https://dailychanges.domaintools.com/	271ms	5ms	2ms	1st
Unattributable	231ms	5ms	0ms	1st
https://dailychanges.domaintools.com/js/lib/jquery/1.8.3/jquery.min.js	152ms	112ms	6ms	1st
https://ssl.google-analytics.com/ga.js	87ms	78ms	4ms	3rd

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.

Main HTML Cache-Control

Main HTML max-age=3600 (~60min)

REVIEW

Main HTML max-age=3600 (~60min)

Main HTML cached for 60 minutes -- mild staleness risk

Got: max-age=3600

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.

JavaScript Blocking

1 JS blocking issue(s) detected

REVIEW

1 JS blocking issue(s) detected

6 render-blocking <script src> tag(s) without async/defer

Each `<script src=...>` without `async`, `defer`, or `type="module"` blocks HTML parsing while the browser fetches and executes it. The block lasts the entire round-trip + execution time -- on slow networks this translates directly into LCP delay. Add `defer` (executes after parse, in source order) for scripts that interact with the DOM, or `async` (executes whenever ready) for analytics / independent scripts. Module scripts (`type="module"`) are deferred by default.

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

A+

Page Weight Budget

376 KB transferred, 35 requests

PASS

376 KB transferred, 35 requests

Page weighs 779 KB (376 KB transferred)

35 HTTP requests

Estimated 0.08 g CO2 per page load

376 KB transferred

35 requests

0.08 g CO2 per page load

JavaScript 272.1 KiB 72%

Images 51.0 KiB 14%

HTML 44.2 KiB 12%

CSS 7.1 KiB 2%

Other 1.3 KiB 0%

0 2.4 MB 4.9 MB

Under budget

A+

Third-Party Impact

5% third-party, 0 ms blocking

PASS

5% third-party, 0 ms blocking

Third-party code accounts for 5% of page weight (17.8 KiB of 375.6 KiB)

Third-party blocking time is low (0 ms)

95%

First-party Third-party

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

A+

Font Loading

No web fonts (system fonts)

PASS

No web fonts (system fonts)

No web fonts loaded — system fonts are fastest

No web fonts loaded — system fonts are optimal.

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

Server Response Intelligence

2 server-response signal(s) detected

PASS

2 server-response signal(s) detected

Compressed response missing `Vary` header

The page is served with `Content-Encoding: gzip` but has no `Vary` header. Without `Vary: Accept-Encoding`, intermediary caches (corporate proxies, ISP caches) may serve the compressed variant to clients that didn't send the matching `Accept-Encoding` -- the client sees garbled bytes. Add `Vary: Accept-Encoding` whenever the response is conditionally compressed.

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

35 resources · 376 KB · 161 KB savings available

PASS

35 resources · 376 KB · 161 KB savings available

Within 1MB page-weight target

Got: 376 KB

~161 KB of savings available

2 third-party resources (5% of weight)

35 resources · 375.6 KiB · 2 third-party Within 1MB page-weight target

JavaScript 72% · 272.1 KiB

Image 14% · 52.3 KiB

Document 12% · 44.2 KiB

CSS 2% · 7.1 KiB

~161.3 KiB of savings available

Remove unused JavaScript: 161.3 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

35 resources			375.6 KiB

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

CSS Performance Depth

1 CSS depth issue(s) detected

PASS

1 CSS depth issue(s) detected

5 render-blocking stylesheet(s) -- recommended: <=3

Each `<link rel="stylesheet">` without a non-blocking `media` attribute holds up the first paint. Browsers download all of them before painting any content. Consolidate into 1-2 critical-path stylesheets; defer non-critical CSS via `<link rel="stylesheet" media="print" onload="this.media='all'">` or via the loadCSS pattern; inline above-the-fold CSS in `<style>` to short-circuit the request entirely.

HTTP Caching

max-age=3600 (1 hour)

PASS

max-age=3600 (1 hour)

Cache-Control header is set

Got: max-age=3600

Effective TTL: 1 hour (max-age=3600)

No ETag or Last-Modified header

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

Cache-Control

max-age=3600

Directive	Value	Meaning
max-age	3600	Cache for 1 hour

Effective TTL: 3600 seconds

Network Waterfall

35 requests over 1759ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Third-Party Script Cost

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

INFO

12% of JavaScript execution is third-party

First-party Third-party 87ms · 17KB · $0/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
Google Analytics ssl.google-analytics.com	Analytics	87ms	17 KB	—	$0/mo	Optional

Google Analytics

Analytics

Optional

Execution 87ms

Transfer 17 KB

Monthly Cost $0/mo

How third-party costs are calculated

Image Optimization

2 images, 10 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

10 KB

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

Green Hosting

Image Optimization Audit