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https://alltaxbooks.com

Performance

· 26 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
95
GRADE
A
FIX
0
REVIEW
6
PASS
17
INFO
3

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
95
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
92
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

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

1.10 s

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

1.58 s

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

248 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.

1.57 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.

1.75 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
26
17 PASS 6 REVIEW
B
Image Optimization
10 images, 0 KB saveable
REVIEW
10 images, 0 KB saveable
Info::
All images are well-optimized
10 images 86 KB
0 oversized -0 KB
4 legacy format
0 missing dimensions CLS risk
C
JS Execution Cost
Action
1495ms total JS execution
REVIEW
1495ms total JS execution
Warning::
https://alltaxbooks.com/: 571ms CPU time
Warning::
Unattributable: 480ms CPU time
Warning::
https://alltaxbooks.com/atb-site.min.js?v=20260927...: 444ms CPU time

Main Thread Breakdown

Other 47% Style & Layout 38% Rendering 6% Script Evaluation 6%
ScriptTotalScriptingParse/CompileParty
https://alltaxbooks.com/571ms25ms3ms1st
Unattributable480ms11ms0ms1st
https://alltaxbooks.com/atb-site.min.js?v=20260927r7444ms45ms3ms1st
B
HTTP/3 (QUIC)
HTTP/3 not advertised
REVIEW
HTTP/3 not advertised
Info::
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.
B
Server-Timing Observability
No Server-Timing header found
REVIEW
No Server-Timing header found
Info::
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.
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

B
HTTP Caching
public,max-age=0,must-revalidate
REVIEW
public,max-age=0,must-revalidate
Info::
Cache-Control header is set
Got: public,max-age=0,must-revalidate
Info::
ETag present — enables conditional (304) responses
Cache-Control

public,max-age=0,must-revalidate

DirectiveValueMeaning
public—Any cache may store this response
max-age0Cache for 0 seconds
must-revalidate—Must recheck with server after expiry
A+
Page Weight Budget
161 KB transferred, 17 requests
PASS
161 KB transferred, 17 requests
Info::
Page weighs 345 KB (161 KB transferred)
Info::
17 HTTP requests
Info::
Estimated 0.03 g CO2 per page load
161 KB / 2.4 MB budget
161 KB transferred
17 requests
0.03 g CO2 per page load
Images 86.0 KiB 54%
Other 33.7 KiB 21%
CSS 22.5 KiB 14%
HTML 9.2 KiB 6%
JavaScript 6.6 KiB 4%
Other 2.6 KiB 2%
0 2.4 MB 4.9 MB
Under budget
A+
Third-Party Impact
No third-party resources
PASS
No third-party resources
Info::
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
Info::
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)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
A+
JS Bundles
1 scripts, 0 KB unused
PASS
1 scripts, 0 KB unused
0 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://alltaxbooks.com/atb-site.min.js?v=20260927r77 KB—✓1st
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
1 hints, 0 missing preconnects
PASS
1 hints, 0 missing preconnects
Info::
Page uses 1 resource hint(s)

Current Resource Hints

preconnect
—
preload
1
dns-prefetch
—
prefetch
—

1 resource hints configured

A+
Document Compression
Document response uses brotli
PASS
Document response uses brotli
Info::
Main HTML response uses brotli (Content-Encoding: br)
Brotli is the best text-compression algorithm for general use, ~20% smaller than gzip on average (40% on smaller files). Modern browsers all support it.
A+
LCP Image Preload
LCP preload audit not available
PASS
LCP preload audit not available
Info::
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
Info::
Main HTML max-age=0 (≤ 5min) is appropriate
Got: public,max-age=0,must-revalidate
A+
Server Response Intelligence
3 server-response signal(s) detected
PASS
3 server-response signal(s) detected
Info::
`Cache-Status` header present (RFC 9211): "Netlify Edge"; fwd=miss; fwd-status=200; stored
The page returns a `Cache-Status` header -- the standardized way for CDNs and caches to communicate per-hop cache state to debugging tools. Format: `Cache-Status: cdn-name; hit; ttl=300` (or `; fwd=miss` / `; fwd=stale`). Standard alternative to vendor-specific `X-Cache` patterns each CDN had historically. Cloudflare, Fastly, and Akamai all support emitting it.
Info::
`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).
Info::
`ETag` present -- conditional GET supported
A+
Page Weight Inventory
17 resources · 161 KB · 0 KB savings available
PASS
17 resources · 161 KB · 0 KB savings available
Info::
Within 1MB page-weight target
Got: 161 KB
17 resources · 160.5 KiB · 0 third-party Within 1MB page-weight target
Image 75% · 119.7 KiB
CSS 14% · 22.5 KiB
Document 6% · 9.2 KiB
JavaScript 4% · 6.6 KiB
Other 2% · 2.6 KiB
A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
A+
JavaScript Blocking
No render-blocking JS or document.write usage detected
PASS
No render-blocking JS or document.write usage detected
Info::
No JavaScript blocking issues detected
A+
CSS Performance Depth
No CSS performance depth issues detected
PASS
No CSS performance depth issues detected
Info::
No CSS performance depth issues detected
Asset Compression
No text asset hosts to measure
INFO
No text asset hosts to measure
Info::
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
17 requests over 918ms
INFO
0 ms 500 ms 1.0 s 1.5 s FCP 1.1 s LCP 1.6 shttps://alltaxbooks.com// https://alltaxbooks.com/ — 200 — 9.2 KiB — 90 ms — h2https://alltaxbooks.com/images/atb-office-general-800.webp/images/atb-office-general-800.webp https://alltaxbooks.com/images/atb-office-general-800.webp — 200 — 34.3 KiB — 167 ms — h2https://alltaxbooks.com/atb-site.min.css?v=20260927r7/atb-site.min.css?v=20260927r7 https://alltaxbooks.com/atb-site.min.css?v=20260927r7 — 200 — 21.4 KiB — 217 ms — h2https://alltaxbooks.com/logo-96.webp/logo-96.webp https://alltaxbooks.com/logo-96.webp — 200 — 5.8 KiB — 158 ms — h2https://alltaxbooks.com/icons/flag-us.svg/icons/flag-us.svg https://alltaxbooks.com/icons/flag-us.svg — 200 — 386 B — 80 ms — h2https://alltaxbooks.com/icons/flag-al.svg/icons/flag-al.svg https://alltaxbooks.com/icons/flag-al.svg — 200 — 1.6 KiB — 81 ms — h2https://alltaxbooks.com/icons/flag-es.svg/icons/flag-es.svg https://alltaxbooks.com/icons/flag-es.svg — 200 — 270 B — 150 ms — h2https://alltaxbooks.com/icons/flag-it.svg/icons/flag-it.svg https://alltaxbooks.com/icons/flag-it.svg — 200 — 302 B — 132 ms — h2https://alltaxbooks.com/atb-site.min.js?v=20260927r7/atb-site.min.js?v=20260927r7 https://alltaxbooks.com/atb-site.min.js?v=20260927r7 — 200 — 6.6 KiB — 166 ms — h2https://alltaxbooks.com/print.css/print.css https://alltaxbooks.com/print.css — 200 — 1.1 KiB — 157 ms — h2https://alltaxbooks.com/manifest.webmanifest/manifest.webmanifest https://alltaxbooks.com/manifest.webmanifest — 200 — 2.6 KiB — 173 ms — h2https://alltaxbooks.com/images/atb-tax-desk-400w.webp/images/atb-tax-desk-400w.webp https://alltaxbooks.com/images/atb-tax-desk-400w.webp — 200 — 17.7 KiB — 225 ms — h2https://alltaxbooks.com/images/imm-01-400w.webp/images/imm-01-400w.webp https://alltaxbooks.com/images/imm-01-400w.webp — 200 — 3.3 KiB — 162 ms — h2https://alltaxbooks.com/images/atb-office-general-480.webp/images/atb-office-general-480.webp https://alltaxbooks.com/images/atb-office-general-480.webp — 200 — 15.3 KiB — 157 ms — h2https://alltaxbooks.com/images/imm-02-400w.webp/images/imm-02-400w.webp https://alltaxbooks.com/images/imm-02-400w.webp — 200 — 7.0 KiB — 158 ms — h2https://alltaxbooks.com/favicon.ico/favicon.ico https://alltaxbooks.com/favicon.ico — 200 — 12.0 KiB — 134 ms — h2https://alltaxbooks.com/icons/icon-192.png/icons/icon-192.png https://alltaxbooks.com/icons/icon-192.png — 200 — 21.7 KiB — 266 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Image Optimization
26 images, 83 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

26

Total Size

83 KB

1 missing dimensions 1 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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