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.
1.24 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
3.55 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
701 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.
3.39 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.
4.18 s
Page Load Progression
DPage Weight BudgetAction2.1 MB transferred, 96 requestsFIX
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
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction7640ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.familysearch.org/en/united-states/ | 4336ms | 1ms | 1ms | 3rd |
| https://edge.fscdn.org/assets/static/js/47279.fe1f33feaa64ddd2.js | 1107ms | 743ms | 103ms | 3rd |
| https://www.familysearch.org/Hemlock-Night-Gosper-this-go-this-Famids-not-of- | 932ms | 825ms | 44ms | 3rd |
| Unattributable | 416ms | 42ms | 0ms | 3rd |
| https://edge.fscdn.org/assets/static/js/main.b8071f901cedad88.js | 317ms | 304ms | 7ms | 3rd |
| https://js-cdn.dynatrace.com/jstag/15c157a40ab/bf99293tkn/a8e5edd77f861ace_complete.js | 256ms | 221ms | 8ms | 3rd |
| https://assets.adobedtm.com/05064fe6cab0/c247cd0acad1/launch-7e623b6eec86.min.js | 198ms | 180ms | 11ms | 3rd |
| https://consent.trustarc.com/asset/notice.js/v/v1.7-1729 | 78ms | 9ms | 3ms | 3rd |
DJS BundlesAction35 scripts, 369 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://edge.fscdn.org/assets/static/js/47279.fe1f33feaa64ddd2.js | 791 KB | 260 KB (33%) | ✓ | 3rd |
| https://js-cdn.dynatrace.com/jstag/15c157a40ab/bf99293tkn/a8e5edd77f861ace_complete.js | 85 KB | 31 KB (37%) | ✓ | 3rd |
| https://assets.adobedtm.com/05064fe6cab0/c247cd0acad1/launch-7e623b6eec86.min.js | 90 KB | 31 KB (34%) | ✓ | 3rd |
| https://consent.trustarc.com/asset/notice.js/v/v1.7-1729 | 36 KB | 26 KB (72%) | ✓ | 3rd |
| https://edge.fscdn.org/assets/static/js/20738.3ae8d4a3f95da517.chunk.js | 31 KB | 21 KB (70%) | ✓ | 3rd |
| https://edge.fscdn.org/assets/static/js/61030.3f9f42eb82442fe5.chunk.js | 4 KB | — | ✓ | 3rd |
| https://edge.fscdn.org/assets/static/js/17502.644cc5e8b8668e38.chunk.js | 11 KB | — | ✓ | 3rd |
| https://edge.fscdn.org/assets/static/js/88373.9f5696ce280cafd6.chunk.js | 2 KB | — | ✓ | 3rd |
| https://edge.fscdn.org/assets/static/js/5695.524851f4d9edb572.chunk.js | 1 KB | — | ✓ | 3rd |
| https://edge.fscdn.org/assets/static/js/11826.c9afe60c55c34604.chunk.js | 1 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 · 2.1 MB · 369 KB savings availableFIX
~369.3 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 96 resources | 2.1 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction13 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
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
A+Font Loading6 fonts (57 KB)PASS
Web fonts
6
57 KB total
Render-blocking
0
of 6
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 HintsNo optimization neededPASS
Network Waterfall96 requests over 8499msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.familysearch.org www.familysearch.org | Other | 4336ms | 8 KB | — | $58/mo | Costly |
edge.fscdn.org edge.fscdn.org | Other | 1107ms | 791 KB | 33% | $15/mo | Costly |
www.familysearch.org www.familysearch.org | Other | 932ms | 241 KB | — | $12/mo | Costly |
Unattributable Unattributable | Other | 416ms | 0 KB | — | $6/mo | Costly |
edge.fscdn.org edge.fscdn.org | Other | 317ms | 74 KB | — | $4/mo | Costly |
js-cdn.dynatrace.com js-cdn.dynatrace.com | Other | 256ms | 85 KB | 37% | $3/mo | Costly |
assets.adobedtm.com assets.adobedtm.com | Other | 198ms | 90 KB | 34% | $3/mo | Optional |
consent.trustarc.com consent.trustarc.com | Other | 78ms | 36 KB | 72% | $1/mo | Optional |
These scripts may cost more than they're worth
- www.familysearch.org adds 4336ms and costs ~$58/month
- edge.fscdn.org adds 1107ms and costs ~$15/month
- www.familysearch.org adds 932ms and costs ~$12/month
- Unattributable adds 416ms and costs ~$6/month
- edge.fscdn.org adds 317ms and costs ~$4/month
- js-cdn.dynatrace.com adds 256ms 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.familysearch.org takes 4336ms 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
edge.fscdn.org takes 1107ms 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.familysearch.org takes 932ms 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 416ms 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
edge.fscdn.org takes 317ms 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
js-cdn.dynatrace.com takes 256ms 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
72% of consent.trustarc.com'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