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.
519 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
630 ms
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
0 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.027
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
519 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.
634 ms
Page Load Progression
375 ms 750 ms 1.1 s 1.5 s 1.9 s 2.2 s 2.6 s 3.0 sDThird-Party ImpactAction99% third-party, 0 ms blockingFIX
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
A+Page Weight Budget84 KB transferred, 16 requestsPASS
A+Text CompressionAll text resources are compressedPASS
A+Image Optimization8 images, 0 KB saveablePASS
A+JS Execution Cost54ms total JS executionPASS
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.bookstime.com/ | 54ms | 9ms | 1ms | 3rd |
A+Font LoadingNo web fonts (system fonts)PASS
A+JS Bundles5 scripts, 0 KB unusedPASS
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.bookstime.com/wp-content/cache/autoptimize/js/autoptimize_single_d15948c46caba0e98253d8e6d58a1e75.js?ver=6.4.2 | 1 KB | — | ✓ | 3rd |
| https://www.bookstime.com/wp-content/cache/autoptimize/js/autoptimize_single_00c9129b65c6d7b004242d021002c77c.js | 1 KB | — | ✓ | 3rd |
| https://www.bookstime.com/wp-content/cache/autoptimize/js/autoptimize_single_a62e653adc2ad2b15286e740014219db.js | 1 KB | — | ✓ | 3rd |
| https://www.bookstime.com/wp-content/cache/autoptimize/js/autoptimize_single_43701318bd1d5cd797d720412647dc0f.js?ver=2.2.5 | 1 KB | — | ✓ | 3rd |
| https://www.bookstime.com/wp-content/plugins/rocket-lazy-load/assets/js/16.1/lazyload.min.js | 3 KB | — | ✓ | 3rd |
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
APage Weight Inventory16 resources · 84 KB · 0 KB savings availablePASS
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 16 resources | 83.5 KiB | ||||||
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
Network Waterfall16 requests over 203msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.bookstime.com www.bookstime.com | Other | 54ms | 15 KB | — | $0/mo | Optional |
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