Performance
· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
949 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
3.05 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
158 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.059
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
2.27 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.
4.20 s
Page Load Progression
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BThird-Party Impact47% third-party, 0 ms blockingREVIEW
CImage OptimizationAction20 images, 0 KB saveableREVIEW
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
CJS Execution CostAction1349ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://book-of-ra-fixed.com/static/js/all.js | 485ms | 286ms | 45ms | 1st |
| https://www.googletagmanager.com/gtag/js?id=G-R0SCZPHHVG | 352ms | 222ms | 128ms | 3rd |
| https://book-of-ra-fixed.com/ | 295ms | 13ms | 3ms | 1st |
| Unattributable | 216ms | 6ms | 0ms | 3rd |
BJS Bundles8 scripts, 120 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtag/js?id=G-R0SCZPHHVG | 157 KB | 66 KB (42%) | ✓ | 3rd |
| https://book-of-ra-fixed.com/static/js/all.js | 92 KB | 54 KB (59%) | ✓ | 1st |
| https://book-of-ra-fixed.com/wp-content/plugins/universal-banner-popup/resources/js/ajax.js?ver=1.0 | 1 KB | — | ✓ | 1st |
| https://book-of-ra-fixed.com/wp-content/plugins/webp-express/js/lazysizes.min.js | 4 KB | — | ✓ | 1st |
| https://book-of-ra-fixed.com/wp-content/plugins/wp-tt-second-offer-links/script.js?ver=1.2.4 | 1 KB | — | ✓ | 1st |
| https://book-of-ra-fixed.com/static/js/custom.js | 5 KB | — | ✓ | 1st |
| https://book-of-ra-fixed.com/static/js/user.js | 3 KB | — | ✓ | 1st |
| https://book-of-ra-fixed.com/wp-content/plugins/wp-tt-rating-stars/static/js/rating.js?ver=5.4.2 | 2 KB | — | ✓ | 1st |
Consider code splitting or tree shaking to reduce unused code.
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.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
A+Page Weight Budget497 KB transferred, 37 requestsPASS
A+Text CompressionAll text resources are compressedPASS
A+Font Loading4 fonts (55 KB)PASS
Web fonts
4
55 KB total
Render-blocking
0
of 4
Dominant font-display
swap
Most common across fonts
Font loading timeline
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 CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource Hints9 hints, 0 missing preconnectsPASS
Current Resource Hints
9 resource hints configured
APage Weight Inventory37 resources · 497 KB · 120 KB savings availablePASS
~120.2 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 37 resources | 496.7 KiB | ||||||
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
Network Waterfall37 requests over 1833msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Google Tag Manager www.googletagmanager.com | Tag Manager | 352ms | 157 KB | 42% | €5/mo | Costly |
Unattributable Unattributable | Other | 216ms | 0 KB | — | €3/mo | Costly |
These scripts may cost more than they're worth
- Google Tag Manager adds 352ms and costs ~€5/month
- Unattributable adds 216ms and costs ~€3/month
42% of JavaScript execution time comes from third-party scripts.
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
Google Tag Manager takes 352ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Unattributable takes 216ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev