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.
1.10 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.30 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
161 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.
2.97 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.
4.84 s
Page Load Progression
866 ms
1.7 s
2.6 s 3.5 s
4.3 s 5.2 s
6.1 s
6.9 sFPage Weight BudgetAction4.7 MB transferred, 339 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
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
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
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DJS Execution CostAction3217ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://1click-blinds.com/?shpxid=10d3e098-cb73-4d9b-8526-071bbb0b48af | 1115ms | 106ms | 24ms | 3rd |
| Unattributable | 760ms | 102ms | 0ms | 1st |
| https://1click-blinds.com/cdn/wpm/b5f5c0921we198f819p6efddfcfm66c0f9a3m.js | 224ms | 192ms | 10ms | 3rd |
| https://1click-blinds.com/cdn/shop/t/30/assets/lazysizes.js?v=9525017869278013171786454101 | 211ms | 80ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-NWS4WBSBS1 | 114ms | 97ms | 16ms | 3rd |
| https://1click-blinds.com/cdn/s/trekkie.storefront.7bcd7bb8195e24c65a61d69d69eb32392ed0d53f.min.js | 97ms | 61ms | 7ms | 3rd |
| https://connect.facebook.net/en_US/fbevents.js | 95ms | 70ms | 13ms | 3rd |
| https://assets.cloudlift.app/api/assets/options.js?shop=831ba5-4.myshopify.com | 95ms | 26ms | 69ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=GT-K55FGPL | 80ms | 55ms | 11ms | 3rd |
| https://product-samples.herokuapp.com/complied/main.min.js?shop=831ba5-4.myshopify.com | 69ms | 33ms | 35ms | 3rd |
Showing top 10 of 16 scripts
FJS BundlesAction211 scripts, 860 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://cdn.jsdelivr.net/gh/cloudlift-app/cdn@0.15.68/static/app-options.js | 140 KB | 129 KB (92%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-NWS4WBSBS1&cx=c>m=4e68e1 | 182 KB | 122 KB (67%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-NWS4WBSBS1&cx=c>m=4e68e1 | 182 KB | 122 KB (67%) | ✓ | 3rd |
| https://cdnjs.cloudflare.com/ajax/libs/three.js/r128/three.min.js | 119 KB | 86 KB (73%) | ✓ | 3rd |
| https://js.klarna.com/web-sdk/v1/1.0.238/sdk.js | 145 KB | 82 KB (56%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-NWS4WBSBS1 | 183 KB | 75 KB (41%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=GT-K55FGPL | 144 KB | 64 KB (44%) | ✓ | 3rd |
| https://cdn.shopify.com/extensions/019f3d7a-6de3-7ebf-83ac-112375e26f04/product-samples-92/assets/main.min.js?shop=831ba5-4.myshopify.com | 65 KB | 42 KB (65%) | ✓ | 3rd |
| https://connect.facebook.net/en_US/fbevents.js | 105 KB | 40 KB (38%) | ✓ | 3rd |
| https://1click-blinds.com/cdn/shop/t/30/assets/swiper-bundle.min.js?v=118526235923544450021786454101 | 37 KB | 35 KB (97%) | ✓ | 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
FPage Weight InventoryAction339 resources · 4.7 MB · 860 KB savings availableFIX
~860.3 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 339 resources | 4.7 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction29 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
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
A+Font Loading12 fonts (491 KB)PASS
Web fonts
12
491 KB total
Render-blocking
0
of 12
Dominant font-display
swap
Most common across fonts
Font loading timeline
- 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 ~74 KB and ~148 ms
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+Compression AlgorithmMain response uses brotliPASS
A+LCP Image PreloadLCP preload audit not availablePASS
A+Server-Timing Observability15 Server-Timing entries advertisedPASS
A+Server Response Intelligence2 server-response signal(s) detectedPASS
Network Waterfall339 requests over 7298msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
1click-blinds.com 1click-blinds.com | Other | 1115ms | 83 KB | — | £6/mo | Costly |
1click-blinds.com 1click-blinds.com | Other | 224ms | 71 KB | 44% | £1/mo | Costly |
1click-blinds.com 1click-blinds.com | Other | 211ms | 5 KB | — | £1/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 114ms | 183 KB | 41% | £1/mo | Optional |
1click-blinds.com 1click-blinds.com | Other | 97ms | 28 KB | — | £0/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 95ms | 105 KB | 38% | £0/mo | Optional |
assets.cloudlift.app assets.cloudlift.app | Other | 95ms | 187 KB | — | £0/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 80ms | 144 KB | 44% | £0/mo | Optional |
product-samples.herokuapp.com product-samples.herokuapp.com | Other | 69ms | 0 KB | — | £0/mo | Optional |
1click-blinds.com 1click-blinds.com | Other | 66ms | 23 KB | — | £0/mo | Optional |
1click-blinds.com 1click-blinds.com | Other | 65ms | 21 KB | — | £0/mo | Optional |
1click-blinds.com 1click-blinds.com | Other | 64ms | 4 KB | — | £0/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 58ms | 25 KB | — | £0/mo | Optional |
cdnjs cdnjs.cloudflare.com | CDN | 54ms | 119 KB | 73% | £0/mo | Optional |
cdn.shopify.com cdn.shopify.com | Other | 52ms | 19 KB | — | £0/mo | Optional |
These scripts may cost more than they're worth
- 1click-blinds.com adds 1115ms and costs ~£6/month
- 1click-blinds.com adds 224ms and costs ~£1/month
- 1click-blinds.com adds 211ms and costs ~£1/month
76% 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
1click-blinds.com takes 1115ms 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
1click-blinds.com takes 224ms 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
1click-blinds.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
73% of cdnjs'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
Real-User Performance (CrUX)Field metrics from the Chrome User Experience ReportINFO
Chrome User Experience (CrUX)
Real-user metrics from the Chrome UX Report (2026-07-20 — 2026-08-16)
LCP (p75)
1631 ms
88% good
INP (p75)
94 ms
96% good
CLS (p75)
0.120
73% good
FCP (p75)
1423 ms
TTFB (p75)
397 ms
Image Optimization20 images, 115 KB total, 85 KB wastedINFO
Image Optimization Audit
Total Images
20
Total Size
115 KB
Oversized
4
Wasted
85 KB