https://alltaxbooks.com
Performance
· 26 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.SCORE
97
GRADE
A+
FIX
0
REVIEW
4
PASS
19
INFO
3
Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
100
100
100
100
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
1.18 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.55 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
9 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.
1.48 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.
1.63 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 sChecks
2619 PASS 4 REVIEW
BImage Optimization20 images, 0 KB saveableREVIEW
Image Optimization
20 images, 0 KB saveable
20 images, 0 KB saveable
Info::
All images are well-optimized
20 images 191 KB
0 oversized -0 KB
4 legacy format
0 missing dimensions CLS risk
BHTTP/3 (QUIC)HTTP/3 not advertisedREVIEW
HTTP/3 (QUIC)
HTTP/3 not advertised
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.
BServer-Timing ObservabilityNo Server-Timing header foundREVIEW
Server-Timing Observability
No Server-Timing header found
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.
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
ActionWhether the site is served from green-energy infrastructure
Green Hosting
No green hosting detected
A+Page Weight Budget275 KB transferred, 26 requestsPASS
Page Weight Budget
275 KB transferred, 26 requests
275 KB transferred, 26 requests
Info::
Page weighs 523 KB (275 KB transferred)
Info::
26 HTTP requests
Info::
Estimated 0.06 g CO2 per page load
275 KB transferred
26 requests
0.06 g CO2 per page load
Images 190.6 KiB 69%
Other 32.7 KiB 12%
CSS 32.4 KiB 12%
HTML 9.1 KiB 3%
JavaScript 7.8 KiB 3%
Other 2.6 KiB 1%
0 2.4 MB 4.9 MB
Under budget
A+Third-Party ImpactNo third-party resourcesPASS
Third-Party Impact
No third-party resources
No third-party resources
Info::
No third-party resources detected
No third-party resources detected — all resources are first-party.
A+Text CompressionAll text resources are compressedPASS
Text Compression
All text resources are compressed
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+JS Execution Cost484ms total JS executionPASS
JS Execution Cost
484ms total JS execution
484ms total JS execution
Info::
Unattributable: 246ms CPU time
Info::
https://alltaxbooks.com/: 238ms CPU time
Main Thread Breakdown
Other 50% Style & Layout 30% Script Evaluation 9% Rendering 6% Parse HTML & CSS 5%
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 246ms | 6ms | 0ms | 1st |
| https://alltaxbooks.com/ | 238ms | 15ms | 2ms | 1st |
A+Font LoadingNo web fonts (system fonts)PASS
Font Loading
No web fonts (system fonts)
No web fonts (system fonts)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
A+JS Bundles1 scripts, 0 KB unusedPASS
JS Bundles
1 scripts, 0 KB unused
1 scripts, 0 KB unused
0 KB unused JavaScript
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://alltaxbooks.com/atb-site-20261005r32.min.js?v=20261008r51 | 8 KB | — | ✓ | 1st |
A+Resource CachingAll resources properly cachedPASS
Resource Caching
All resources properly cached
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+Critical Rendering PathNo render-blocking resourcesPASS
Critical Rendering Path
No render-blocking resources
No render-blocking resources
Info::
No render-blocking resources detected
A+Resource Hints5 hints, 0 missing preconnectsPASS
Resource Hints
5 hints, 0 missing preconnects
5 hints, 0 missing preconnects
Info::
Page uses 5 resource hint(s)
Current Resource Hints
preconnect—
preload 5
dns-prefetch—
prefetch—
5 resource hints configured
A+Document CompressionDocument response uses brotliPASS
Document Compression
Document response uses brotli
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 PreloadLCP preload audit not availablePASS
LCP Image Preload
LCP preload audit not available
LCP preload audit not available
Info::
LCP image preload audit not available for this scan
A+Main HTML Cache-ControlMain HTML max-age=300 (≤ 5min) is appropriatePASS
Main HTML Cache-Control
Main HTML max-age=300 (≤ 5min) is appropriate
Main HTML max-age=300 (≤ 5min) is appropriate
Info::
Main HTML max-age=300 (≤ 5min) is appropriate
Got: public,max-age=300,must-revalidate
A+Server Response Intelligence3 server-response signal(s) detectedPASS
Server Response Intelligence
3 server-response signal(s) detected
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 Inventory26 resources · 275 KB · 0 KB savings availablePASS
Page Weight Inventory
26 resources · 275 KB · 0 KB savings available
26 resources · 275 KB · 0 KB savings available
Info::
Within 1MB page-weight target
Got: 275 KB
26 resources · 275.3 KiB · 0 third-party Within 1MB page-weight target
Image 81% · 223.3 KiB
CSS 12% · 32.4 KiB
Document 3% · 9.1 KiB
JavaScript 3% · 7.8 KiB
Other 1% · 2.6 KiB
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 26 resources | 275.3 KiB | ||||||
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
Render-Blocking Resources
No render-blocking resources detected
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+Third-Party ResourcesNo third-party resources detectedPASS
Third-Party Resources
No third-party resources detected
No third-party resources detected
A+JavaScript BlockingNo render-blocking JS or document.write usage detectedPASS
JavaScript Blocking
No render-blocking JS or document.write usage detected
No render-blocking JS or document.write usage detected
Info::
No JavaScript blocking issues detected
A+CSS Performance DepthNo CSS performance depth issues detectedPASS
CSS Performance Depth
No CSS performance depth issues detected
No CSS performance depth issues detected
Info::
No CSS performance depth issues detected
A+HTTP Cachingmax-age=300 (5 minutes)PASS
HTTP Caching
max-age=300 (5 minutes)
max-age=300 (5 minutes)
Info::
Cache-Control header is set
Got: public,max-age=300,must-revalidate
Info::
Effective TTL: 5 minutes (max-age=300)
Info::
ETag present — enables conditional (304) responses
Cache-Control
public,max-age=300,must-revalidate
| Directive | Value | Meaning |
|---|---|---|
| public | — | Any cache may store this response |
| max-age | 300 | Cache for 5 minutes |
| must-revalidate | — | Must recheck with server after expiry |
Effective TTL: 300 seconds
Asset CompressionNo text asset hosts to measureINFO
Asset Compression
No text asset hosts to measure
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 Waterfall26 requests over 874msINFO
Network Waterfall
26 requests over 874ms
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Image Optimization25 images, 22 KB total, 0 KB wastedINFO
Image Optimization
25 images, 22 KB total, 0 KB wasted
Image Optimization Audit
Total Images
25
Total Size
22 KB
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.