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.
905 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.71 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
178 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.143
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
905 ms
Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.
2.53 s
Page Load Progression
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DJS BundlesAction58 scripts, 393 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.bible.com/_next/static/chunks/39e148055ec22a1f.js | 80 KB | 70 KB (87%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-9NFX76M6PB&cx=c>m=4e64k0h1 | 144 KB | 64 KB (44%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-NCSL8T2 | 126 KB | 64 KB (51%) | ✓ | 3rd |
| https://www.bible.com/_next/static/chunks/6a2dc2079c320441.js | 57 KB | 50 KB (89%) | ✓ | 3rd |
| https://www.bible.com/_next/static/chunks/20cbca8940d6a351.js | 51 KB | 50 KB (98%) | ✓ | 3rd |
| https://www.bible.com/_next/static/chunks/89d0a8fa710fabf2.js | 97 KB | 48 KB (50%) | ✓ | 3rd |
| https://www.bible.com/_next/static/chunks/781865ae69de5263.js | 37 KB | 25 KB (69%) | ✓ | 3rd |
| https://www.bible.com/_next/static/chunks/f38609e450a3bed0.js | 22 KB | 21 KB (98%) | ✓ | 3rd |
| https://www.bible.com/_next/static/chunks/ec15972c737044ad.js | 2 KB | — | ✓ | 3rd |
| https://www.bible.com/_next/static/chunks/cdca6ab6b61e94e9.js | 0 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
DPage Weight InventoryAction99 resources · 1.8 MB · 393 KB savings availableFIX
~392.5 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 99 resources | 1.8 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CPage Weight BudgetAction1.8 MB transferred, 99 requestsREVIEW
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
BJS Execution Cost661ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.bible.com/_next/static/chunks/89d0a8fa710fabf2.js | 211ms | 193ms | 13ms | 3rd |
| https://www.bible.com/ | 130ms | 6ms | 0ms | 3rd |
| Unattributable | 127ms | 10ms | 0ms | 3rd |
| https://www.bible.com/_next/static/chunks/turbopack-db4853e3b28f167a.js | 125ms | 124ms | 1ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-9NFX76M6PB&cx=c>m=4e64k0h1 | 68ms | 54ms | 14ms | 3rd |
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
A+Image Optimization19 images, 0 KB saveablePASS
A+Font Loading5 fonts (417 KB)PASS
Web fonts
5
417 KB total
Render-blocking
0
of 5
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Convert to woff2 for ~30% smaller file size
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- Convert to woff2 for ~30% smaller file size
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
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 ~247 KB and ~494 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
Network Waterfall99 requests over 2746msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.bible.com www.bible.com | Other | 211ms | 97 KB | 50% | €2/mo | Costly |
www.bible.com www.bible.com | Other | 130ms | 35 KB | — | €1/mo | Optional |
Unattributable Unattributable | Other | 127ms | 0 KB | — | €1/mo | Optional |
www.bible.com www.bible.com | Other | 125ms | 4 KB | — | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 68ms | 144 KB | 44% | €1/mo | Optional |
These scripts may cost more than they're worth
- www.bible.com adds 211ms and costs ~€2/month
100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.
When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.
Learn more ▾ ▴
Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.
Source: web.dev
www.bible.com takes 211ms 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