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.
1.43 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
4.40 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
593 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.468
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
3.85 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.
4.50 s
Page Load Progression
FPage Weight BudgetAction6.6 MB transferred, 174 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
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 CostAction3242ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.powells.com/_nuxt/BVgun25H.js | 779ms | 621ms | 2ms | 3rd |
| https://www.powells.com/ | 583ms | 84ms | 2ms | 3rd |
| Unattributable | 565ms | 146ms | 0ms | 3rd |
| https://cdn-cookieyes.com/client_data/9671adb06bcd8c59e491f04a/script.js | 223ms | 211ms | 3ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-XR64K8H8MP&cx=c>m=4e64k0 | 212ms | 169ms | 25ms | 3rd |
| https://scripts.clarity.ms/0.8.59/clarity.js | 195ms | 174ms | 3ms | 3rd |
| https://cdn-cookieyes.com/client_data/9671adb06bcd8c59e491f04a/banner.js | 118ms | 33ms | 1ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-WFM2564 | 114ms | 88ms | 20ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-1071649651&cx=c>m=4e64k0 | 107ms | 91ms | 16ms | 3rd |
| https://www.powells.com/cdn-cgi/challenge-platform/scripts/jsd/main.js | 100ms | 97ms | 1ms | 3rd |
Showing top 10 of 14 scripts
FJS BundlesAction86 scripts, 611 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.powells.com/_nuxt/BVgun25H.js | 389 KB | 223 KB (58%) | ✓ | 3rd |
| https://www.powells.com/_nuxt/BWB9EZxR.js | 0 KB | 97 KB (59%) | ✓ | 3rd |
| https://www.powells.com/_nuxt/BWB9EZxR.js | 64 KB | 97 KB (59%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-XR64K8H8MP&cx=c>m=4e64k0 | 179 KB | 65 KB (36%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-1071649651&cx=c>m=4e64k0 | 146 KB | 65 KB (45%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-WFM2564 | 152 KB | 64 KB (42%) | ✓ | 3rd |
| https://www.powells.com/_nuxt/Bta3NaQ2.js | 1 KB | — | ✓ | 3rd |
| https://static-tracking.klaviyo.com/onsite/js/build-preview/commit-b69bb7518cfdbf0112439ab33978e373c0f32fb2/static.d34531a9ee28a48e4d20.js?cb=2 | 1 KB | — | ✓ | 3rd |
| https://www.powells.com/_nuxt/9_y3FPYQ.js | 1 KB | — | ✓ | 3rd |
| https://www.powells.com/_nuxt/C_NAosHn.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
FPage Weight InventoryAction174 resources · 6.6 MB · 611 KB savings availableFIX
~611.5 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 174 resources | 6.6 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction43 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
A+Text CompressionAll text resources are compressedPASS
A+Font Loading3 fonts (821 KB)PASS
Web fonts
3
821 KB total
Render-blocking
0
of 3
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Convert to woff2 for ~30% smaller file size
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- Convert to woff2 for ~30% smaller file size
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 ~524 KB and ~1048 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
Network Waterfall174 requests over 5977msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.powells.com www.powells.com | Other | 779ms | 389 KB | 58% | $10/mo | Costly |
www.powells.com www.powells.com | Other | 583ms | 148 KB | — | $8/mo | Costly |
Unattributable Unattributable | Other | 565ms | 0 KB | — | $8/mo | Costly |
cdn-cookieyes.com cdn-cookieyes.com | Other | 223ms | 9 KB | — | $3/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 212ms | 179 KB | 36% | $3/mo | Costly |
Microsoft Clarity scripts.clarity.ms | Session Replay | 195ms | 26 KB | — | $3/mo | Optional |
cdn-cookieyes.com cdn-cookieyes.com | Other | 118ms | 8 KB | — | $2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 114ms | 152 KB | 42% | $2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 107ms | 146 KB | 45% | $1/mo | Optional |
www.powells.com www.powells.com | Other | 100ms | 0 KB | — | $1/mo | Optional |
www.powells.com www.powells.com | Other | 80ms | 0 KB | — | $1/mo | Optional |
static.klaviyo.com static.klaviyo.com | Other | 58ms | 52 KB | — | $1/mo | Optional |
static.klaviyo.com static.klaviyo.com | Other | 54ms | 8 KB | — | $1/mo | Optional |
static.klaviyo.com static.klaviyo.com | Other | 53ms | 23 KB | — | $1/mo | Optional |
These scripts may cost more than they're worth
- www.powells.com adds 779ms and costs ~$10/month
- www.powells.com adds 583ms and costs ~$8/month
- Unattributable adds 565ms and costs ~$8/month
- cdn-cookieyes.com adds 223ms and costs ~$3/month
- Google Tag Manager adds 212ms 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.powells.com takes 779ms 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
58% of www.powells.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
www.powells.com takes 583ms 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 565ms 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
cdn-cookieyes.com takes 223ms 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
Google Tag Manager takes 212ms 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