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.
3.24 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
8.21 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
1.20 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.014
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
3.24 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.
12.22 s
Page Load Progression
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DJS Execution CostAction2939ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.bible.com/_next/static/chunks/89d0a8fa710fabf2.js | 852ms | 800ms | 40ms | 3rd |
| Unattributable | 472ms | 42ms | 0ms | 3rd |
| https://www.bible.com/_next/static/chunks/turbopack-db4853e3b28f167a.js | 469ms | 467ms | 2ms | 3rd |
| https://www.bible.com/ | 441ms | 22ms | 1ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-9NFX76M6PB&cx=c>m=4e64k0 | 280ms | 221ms | 54ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-NCSL8T2 | 188ms | 137ms | 49ms | 3rd |
| https://www.bible.com/_next/static/chunks/f3e5bee0c78228a9.js | 113ms | 105ms | 0ms | 3rd |
| https://www.bible.com/_next/static/chunks/0f5bf3135bd5c401.js | 67ms | 35ms | 4ms | 3rd |
| https://www.bible.com/_next/static/chunks/236e52659ba321fb.js | 57ms | 54ms | 2ms | 3rd |
DJS BundlesAction58 scripts, 383 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=4e64k0 | 144 KB | 65 KB (45%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-NCSL8T2 | 126 KB | 53 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/94e1c024bc9ff256.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 InventoryAction96 resources · 1.7 MB · 383 KB savings availableFIX
~382.5 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 96 resources | 1.7 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CPage Weight BudgetAction1.7 MB transferred, 96 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
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 Optimization16 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 Hints5 hints, 0 missing preconnectsPASS
Current Resource Hints
5 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall96 requests over 2087msINFO
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 | 852ms | 97 KB | 50% | €9/mo | Costly |
Unattributable Unattributable | Other | 472ms | 0 KB | — | €5/mo | Costly |
www.bible.com www.bible.com | Other | 469ms | 4 KB | — | €5/mo | Costly |
www.bible.com www.bible.com | Other | 441ms | 35 KB | — | €5/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 280ms | 144 KB | 45% | €3/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 188ms | 126 KB | 51% | €2/mo | Optional |
www.bible.com www.bible.com | Other | 113ms | 0 KB | — | €1/mo | Optional |
www.bible.com www.bible.com | Other | 67ms | 4 KB | — | €1/mo | Optional |
www.bible.com www.bible.com | Other | 57ms | 4 KB | — | €1/mo | Optional |
These scripts may cost more than they're worth
- www.bible.com adds 852ms and costs ~€9/month
- Unattributable adds 472ms and costs ~€5/month
- www.bible.com adds 469ms and costs ~€5/month
- www.bible.com adds 441ms and costs ~€5/month
- Google Tag Manager adds 280ms and costs ~€3/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 852ms 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 472ms 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
www.bible.com takes 469ms 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
www.bible.com takes 441ms 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
Google Tag Manager takes 280ms 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
51% of Google Tag Manager's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev