Performance
· 22 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.
1.77 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
3.10 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
76 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.079
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
2.00 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.
3.95 s
Page Load Progression
FPage Weight BudgetAction2.6 MB transferred, 75 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
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
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DJS BundlesAction34 scripts, 500 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://assets.squarespace.com/universal/scripts-compressed/common-6a459dad7444b31d-min.en-US.js | 274 KB | 177 KB (64%) | ✓ | 3rd |
| https://assets.squarespace.com/universal/scripts-compressed/commerce-cd17439efa931e38-min.en-US.js | 189 KB | 154 KB (82%) | ✓ | 3rd |
| https://assets.squarespace.com/universal/scripts-compressed/common-vendors-a5542c2814272dd7-min.en-US.js | 168 KB | 59 KB (35%) | ✓ | 3rd |
| https://assets.squarespace.com/universal/scripts-compressed/extract-css-moment-js-vendor-6f2a1f6ec9a41489-min.en-US.js | 44 KB | 43 KB (98%) | ✓ | 3rd |
| https://assets.squarespace.com/universal/scripts-compressed/common-vendors-stable-b8d716935110c7b2-min.en-US.js | 69 KB | 40 KB (58%) | ✓ | 3rd |
| https://assets.squarespace.com/universal/scripts-compressed/37231-b90ed72cfa0f5072-min.en-US.js | 47 KB | 27 KB (58%) | ✓ | 3rd |
| https://assets.squarespace.com/universal/scripts-compressed/trigger-animation-runtime-a424caa78dd2266e-min.en-US.js | 1 KB | — | ✓ | 3rd |
| https://assets.squarespace.com/universal/scripts-compressed/19085-081d931e05f25f02-min.en-US.js | 15 KB | — | ✓ | 3rd |
| https://assets.squarespace.com/universal/scripts-compressed/visitor-site-error-reporter-a38266454b6c35f7-min.en-US.js | 2 KB | — | ✓ | 3rd |
| https://assets.squarespace.com/@sqs/polyfiller/1.6/modern.js | 42 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
FPage Weight InventoryAction75 resources · 2.6 MB · 500 KB savings availableFIX
~500.3 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 75 resources | 2.6 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BJS Execution Cost739ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.heidcustomwoodworking.com/ | 224ms | 12ms | 7ms | 3rd |
| https://assets.squarespace.com/universal/scripts-compressed/common-6a459dad7444b31d-min.en-US.js | 184ms | 152ms | 22ms | 3rd |
| https://assets.squarespace.com/universal/scripts-compressed/10433-f7fe72faea365c96-min.en-US.js | 142ms | 45ms | 1ms | 3rd |
| Unattributable | 113ms | 2ms | 0ms | 3rd |
| https://static1.squarespace.com/static/vta/5c5a519771c10ba3470d8101/scripts/site-bundle.24618f321442829cf50ddb341e64781c.js | 76ms | 41ms | 2ms | 3rd |
BHTTP/3 (QUIC)HTTP/3 not advertisedREVIEW
CCompression AlgorithmActionMain response served uncompressedREVIEW
BMain HTML Cache-ControlNo Cache-Control header on main HTML responseREVIEW
BServer-Timing ObservabilityNo Server-Timing header foundREVIEW
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
AImage Optimization20 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+Font Loading6 fonts (107 KB)PASS
Web fonts
6
107 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
A+LCP Image PreloadLCP preload audit not availablePASS
A+Server Response Intelligence1 server-response signal(s) detectedPASS
Network Waterfall75 requests over 2516msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.heidcustomwoodworking.com www.heidcustomwoodworking.com | Other | 224ms | 165 KB | — | $1/mo | Costly |
assets.squarespace.com assets.squarespace.com | Other | 184ms | 274 KB | 64% | $1/mo | Optional |
assets.squarespace.com assets.squarespace.com | Other | 142ms | 11 KB | — | $1/mo | Optional |
Unattributable Unattributable | Other | 113ms | 0 KB | — | $1/mo | Optional |
static1.squarespace.com static1.squarespace.com | Other | 76ms | 37 KB | — | $0/mo | Optional |
These scripts may cost more than they're worth
- www.heidcustomwoodworking.com adds 224ms and costs ~$1/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.heidcustomwoodworking.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
64% of assets.squarespace.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
Image Optimization119 images, 729 KB total, 267 KB wastedINFO
Image Optimization Audit
Total Images
119
Total Size
729 KB
Oversized
2
Wasted
267 KB