Performance
· 26 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.
3.41 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
7.64 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
3.49 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.035
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
5.12 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.
12.71 s
Page Load Progression
FJS Execution CostAction10208ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://fantasticforms.com/static/js/main.fae5d99a.js | 6397ms | 3568ms | 1942ms | 1st |
| https://fantasticforms.com/ | 1368ms | 73ms | 5ms | 1st |
| https://fantasticforms.com/cdn-cgi/challenge-platform/scripts/jsd/main.js | 945ms | 904ms | 12ms | 1st |
| Unattributable | 871ms | 32ms | 0ms | 1st |
| https://cdn.tailwindcss.com/ | 335ms | 209ms | 88ms | 3rd |
| https://fantasticforms.com/f/45a05355-deec-458e-bec2-f86c863541ad | 120ms | 61ms | 3ms | 1st |
| https://static.cloudflareinsights.com/beacon.min.js/v833ccba57c9e4d2798f2e76cebdd09a11778172276447 | 89ms | 57ms | 20ms | 3rd |
| https://assets.emergent.sh/scripts/emergent-main.js | 82ms | 64ms | 11ms | 3rd |
FJS BundlesAction12 scripts, 1.3 MB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://fantasticforms.com/static/js/main.fae5d99a.js | 879 KB | 659 KB (75%) | ✓ | 1st |
| https://fantasticforms.com/static/js/main.fae5d99a.js | 0 KB | 659 KB (75%) | ✓ | 1st |
| https://assets.emergent.sh/scripts/emergent-main.js | 6 KB | — | ✗ | 3rd |
| https://static.cloudflareinsights.com/beacon.min.js/v833ccba57c9e4d2798f2e76cebdd09a11778172276447 | 11 KB | — | ✓ | 3rd |
| https://fantasticforms.com/cdn-cgi/challenge-platform/h/g/scripts/jsd/f95a7f38c08f/main.js? | 9 KB | — | ✓ | 1st |
| https://assets.emergent.sh/scripts/emergent-main.js | 0 KB | — | ✗ | 3rd |
| https://assets.emergent.sh/scripts/debug-monitor.js | 14 KB | — | ✗ | 3rd |
| https://static.cloudflareinsights.com/beacon.min.js/v833ccba57c9e4d2798f2e76cebdd09a11778172276447 | 0 KB | — | ✓ | 3rd |
| https://cdn.tailwindcss.com/3.4.17 | 124 KB | — | ✓ | 3rd |
| https://fantasticforms.com/cdn-cgi/challenge-platform/h/g/scripts/jsd/f95a7f38c08f/main.js? | 0 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
BPage Weight Budget1.1 MB transferred, 59 requestsREVIEW
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
CImage OptimizationAction16 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
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
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
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
BHTTP/3 (QUIC)HTTP/3 not advertisedREVIEW
BCompression AlgorithmMain response uses gzip; brotli would be ~20% smallerREVIEW
CPage Weight InventoryAction59 resources · 1.1 MB · 1.3 MB savings availableREVIEW
~1.3 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 59 resources | 1.1 MiB | ||||||
BJavaScript Blocking2 JS blocking issue(s) detectedREVIEW
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
AThird-Party Impact20% third-party, 0 ms blockingPASS
A+Text CompressionAll text resources are compressedPASS
A+Font Loading6 fonts (63 KB)PASS
Web fonts
6
63 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+Main HTML Cache-ControlMain HTML max-age=300 (≤ 5min) is appropriatePASS
A+Server-Timing Observability3 Server-Timing entries advertisedPASS
AServer Response Intelligence2 server-response signal(s) detectedPASS
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
A+CSS Performance DepthNo CSS performance depth issues detectedPASS
AHTTP Cachingmax-age=300 (5 minutes)PASS
public, max-age=300
| Directive | Value | Meaning |
|---|---|---|
| public | — | Any cache may store this response |
| max-age | 300 | Cache for 5 minutes |
Network Waterfall59 requests over 4225msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
cdn.tailwindcss.com cdn.tailwindcss.com | Other | 335ms | 0 KB | — | €4/mo | Costly |
static.cloudflareinsights.com static.cloudflareinsights.com | Other | 89ms | 0 KB | — | €1/mo | Optional |
assets.emergent.sh assets.emergent.sh | Other | 82ms | 0 KB | — | €1/mo | Optional |
These scripts may cost more than they're worth
- cdn.tailwindcss.com adds 335ms and costs ~€4/month
cdn.tailwindcss.com takes 335ms 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
Image Optimization32 images, 11 KB total, 5 KB wastedINFO
Image Optimization Audit
Total Images
32
Total Size
11 KB
Oversized
1
Wasted
5 KB