Performance
· 23 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.
433 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
3.07 s
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.
0.000
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
802 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.
3.08 s
Page Load Progression
375 ms
750 ms 1.1 s 1.5 s 1.9 s 2.2 s 2.6 s 3.0 sFPage Weight BudgetAction4.3 MB transferred, 169 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
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.
Source: web.dev
DPage Weight InventoryAction169 resources · 4.3 MB · 195 KB savings availableFIX
~195.3 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 169 resources | 4.3 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BThird-Party Impact57% third-party, 0 ms blockingREVIEW
CJS BundlesAction98 scripts, 195 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://mainstreetestatesales.com/cdn/shop/t/1/assets/ndnapps-jslibrary.js?v=171277861806905612121604338468 | 92 KB | 89 KB (97%) | ✓ | 1st |
| https://connect.facebook.net/en_US/fbevents.js | 97 KB | 33 KB (34%) | ✓ | 3rd |
| https://mainstreetestatesales.com/cdn/shop/t/1/assets/theme.js?v=107772646391336992031603833290 | 37 KB | 27 KB (73%) | ✓ | 1st |
| https://mainstreetestatesales.com/cdn/wpm/b81a24193wb0bf602apf85b30fcm71c6b379m.js | 63 KB | 26 KB (41%) | ✓ | 1st |
| https://code.jquery.com/jquery-3.4.1.min.js | 30 KB | 21 KB (70%) | ✓ | 3rd |
| https://mainstreetestatesales.com/cdn/shopifycloud/checkout-web/assets/c1/consent-manager-shared.BWg5aHMf.js | 2 KB | — | ✓ | 1st |
| https://mainstreetestatesales.com/cdn/shopifycloud/storefront/assets/shop_events_listener-3da45d37.js | 4 KB | — | ✓ | 1st |
| https://mainstreetestatesales.com/cdn/shopifycloud/shop-js/modules/v2/chunk.preact-module_Cvpcobqs.esm.js | 5 KB | — | ✓ | 1st |
| https://mainstreetestatesales.com/cdn/shopifycloud/shop-js/modules/v2/chunk.v4_CSBSzmbm.esm.js | 1 KB | — | ✓ | 1st |
| https://mainstreetestatesales.com/cdn/shopifycloud/shop-js/modules/v2/chunk.document_C9LmOiQj.esm.js | 1 KB | — | ✓ | 1st |
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
CCompression AlgorithmActionMain response served uncompressedREVIEW
BMain HTML Cache-ControlNo Cache-Control header on main HTML responseREVIEW
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
AImage Optimization17 images, 0 KB saveablePASS
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
A+JS Execution Cost356ms total JS executionPASS
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 151ms | 5ms | 0ms | 3rd |
| https://mainstreetestatesales.com/ | 137ms | 25ms | 3ms | 1st |
| https://mainstreetestatesales.com/cdn/shop/t/1/assets/lazysizes.js?v=63098554868324070131603833289 | 69ms | 36ms | 0ms | 1st |
A+Font Loading4 fonts (85 KB)PASS
Web fonts
4
85 KB total
Render-blocking
0
of 4
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
A+HTTP/3 (QUIC)HTTP/3 advertised via Alt-SvcPASS
A+LCP Image PreloadLCP preload audit not availablePASS
A+Server-Timing Observability17 Server-Timing entries advertisedPASS
A+Server Response Intelligence2 server-response signal(s) detectedPASS
Network Waterfall169 requests over 4074msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 151ms | 0 KB | — | €1/mo | Optional |
42% 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
Real-User Performance (CrUX)Field metrics from the Chrome User Experience ReportINFO
Chrome User Experience (CrUX)
Real-user metrics from the Chrome UX Report (2026-04-11 — 2026-05-08)
LCP (p75)
1735 ms
87% good
INP (p75)
78 ms
96% good
CLS (p75)
0.000
100% good
FCP (p75)
1074 ms
TTFB (p75)
455 ms
Image Optimization13 images, 2648 KB total, 2304 KB wastedINFO
Image Optimization Audit
Total Images
13
Total Size
2648 KB
Oversized
4
Wasted
2304 KB