Performance
· 15 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.
796 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.49 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
21 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.006
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
1.52 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.
3.78 s
Page Load Progression
FPage Weight BudgetAction4.4 MB transferred, 95 requestsFIX
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.
Source: web.dev
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.
Source: web.dev
Subset fonts to include only used characters, or switch to system font stacks.
Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).
Source: web.dev font loading
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization49 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
BJS Execution Cost763ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://kubiobuilder.com/ | 333ms | 5ms | 0ms | 1st |
| Unattributable | 121ms | 3ms | 0ms | 3rd |
| https://kubiobuilder.com/cdn-cgi/scripts/7d0fa10a/cloudflare-static/rocket-loader.min.js | 118ms | 81ms | 3ms | 1st |
| https://cdn.matomo.cloud/kubiobuilder.matomo.cloud/container_pIUHfj21.js | 96ms | 89ms | 5ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-5S97VL8 | 96ms | 84ms | 11ms | 3rd |
CJS BundlesAction18 scripts, 278 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtm.js?id=GTM-5S97VL8 | 156 KB | 66 KB (43%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-6FS4CWQBES | 174 KB | 66 KB (38%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=UA-212787703-1&cx=c>m=4e64h1 | 116 KB | 65 KB (56%) | ✓ | 3rd |
| https://kubiobuilder.com/wp-content/cache/autoptimize/js/autoptimize_78051c7eaf61be492bc19fe092d21102.js | 92 KB | 52 KB (57%) | ✓ | 1st |
| https://cdn.matomo.cloud/kubiobuilder.matomo.cloud/container_pIUHfj21.js | 68 KB | 29 KB (43%) | ✓ | 3rd |
| https://extendstudio.postaffiliatepro.com/scripts/63roaw?accountId=22ba8b64&url=S_kubiobuilder.com%2F&referrer=&isInIframe=false&getParams=&anchor= | 0 KB | — | ✓ | 3rd |
| https://extendstudio.postaffiliatepro.com/scripts/63joaw | 5 KB | — | ✓ | 3rd |
| https://kubiobuilder.com/wp-includes/js/jquery/jquery.min.js?ver=3.7.1 | 31 KB | — | ✓ | 1st |
| https://kubiobuilder.com/cdn-cgi/scripts/7d0fa10a/cloudflare-static/rocket-loader.min.js | 4 KB | — | ✓ | 1st |
| https://sbl.onfastspring.com/sbl/0.9.4/fastspring-builder.min.js | 12 KB | — | ✓ | 3rd |
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
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
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
CPage Weight InventoryAction95 resources · 4.4 MB · 278 KB savings availableREVIEW
~278.3 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 95 resources | 4.4 MiB | ||||||
A+Third-Party Impact14% third-party, 0 ms blockingPASS
A+Text CompressionAll text resources are compressedPASS
A+Font Loading7 fonts (379 KB)PASS
Web fonts
7
379 KB total
Render-blocking
0
of 7
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Convert to woff2 for ~30% smaller file size
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)
Fixing the unchecked items could save ~9 KB and ~18 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
Network Waterfall95 requests over 4076msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 121ms | 0 KB | — | $1/mo | Optional |
Matomo cdn.matomo.cloud | Analytics | 96ms | 68 KB | 43% | $1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 96ms | 156 KB | 43% | $1/mo | Optional |
41% 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