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.
487 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.75 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
66 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.
1.40 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.
2.08 s
Page Load Progression
FPage Weight BudgetAction3.8 MB transferred, 157 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
DThird-Party ImpactAction85% third-party, 0 ms blockingFIX
DPage Weight InventoryAction157 resources · 3.8 MB · 249 KB savings availableFIX
~249.0 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 157 resources | 3.8 MiB | ||||||
CJS Execution CostAction1590ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://fast.wistia.com/assets/external/E-v1.js | 444ms | 346ms | 18ms | 3rd |
| https://kit.com/ | 367ms | 12ms | 0ms | 1st |
| https://kit.com/_next/static/chunks/framework-108a97c684e06106.js | 263ms | 201ms | 4ms | 1st |
| Unattributable | 168ms | 12ms | 0ms | 3rd |
| https://fast.wistia.com/assets/external/engines/hls_video.js@379dc59f3883ecbd8a4ec99277538cfd8c619ee8 | 150ms | 120ms | 1ms | 3rd |
| https://kit.com/_next/static/chunks/58248-98c4cb3a3e17a94f.js | 144ms | 30ms | 5ms | 1st |
| https://kit.com/_next/static/chunks/pages/index-5716d18a551fff91.js | 55ms | 53ms | 1ms | 1st |
CJS BundlesAction65 scripts, 249 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://fast.wistia.com/assets/external/engines/hls_video.js@379dc59f3883ecbd8a4ec99277538cfd8c619ee8 | 159 KB | 86 KB (54%) | ✓ | 3rd |
| https://fast.wistia.com/assets/external/E-v1.js | 162 KB | 79 KB (49%) | ✓ | 3rd |
| https://kit.com/_next/static/chunks/58248-98c4cb3a3e17a94f.js | 42 KB | 22 KB (53%) | ✓ | 1st |
| https://browser.sentry-cdn.com/9.6.1/bundle.min.js | 25 KB | 21 KB (86%) | ✓ | 3rd |
| https://kit.com/_next/static/chunks/framework-108a97c684e06106.js | 60 KB | 21 KB (35%) | ✓ | 1st |
| https://kit.com/_next/static/chunks/pages/_app-9d7e34aed114936b.js | 46 KB | 20 KB (44%) | ✓ | 1st |
| https://kit.com/_next/static/chunks/4703.40099ab5f7096ba6.js | 1 KB | — | ✓ | 1st |
| https://kit.com/_next/static/chunks/webpack-9bb4b5d0100db25f.js | 12 KB | — | ✓ | 1st |
| https://kit.com/_next/static/chunks/31350.e51b431eceaaa164.js | 1 KB | — | ✓ | 1st |
| https://kit.com/_next/static/chunks/76145.bc81afc9058cf77d.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
BHTTP Cachingpublic, max-age=0, must-revalidateREVIEW
public, max-age=0, must-revalidate
| Directive | Value | Meaning |
|---|---|---|
| public | — | Any cache may store this response |
| max-age | 0 | Cache for 0 seconds |
| must-revalidate | — | Must recheck with server after expiry |
A+Text CompressionAll text resources are compressedPASS
A+Image Optimization50 images, 0 KB saveablePASS
A+Font Loading3 fonts (97 KB)PASS
Web fonts
3
97 KB total
Render-blocking
0
of 3
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+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
Network Waterfall157 requests over 4783msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
fast.wistia.com fast.wistia.com | Other | 444ms | 162 KB | 49% | $6/mo | Costly |
Unattributable Unattributable | Other | 168ms | 0 KB | — | $2/mo | Optional |
fast.wistia.com fast.wistia.com | Other | 150ms | 159 KB | 54% | $2/mo | Optional |
These scripts may cost more than they're worth
- fast.wistia.com adds 444ms and costs ~$6/month
48% 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
fast.wistia.com takes 444ms 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
54% of fast.wistia.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