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.
665 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
945 ms
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
306 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.296
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
1.42 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.
2.52 s
Page Load Progression
DPage Weight BudgetAction2.4 MB transferred, 113 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 ImpactAction97% third-party, 0 ms blockingFIX
FJS BundlesAction65 scripts, 823 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://static.sketchfab.com/static/builds/web/dist/1c76918338bfe04b43c19e45141a8782-v2.js | 256 KB | 184 KB (72%) | ✓ | 3rd |
| https://static.sketchfab.com/static/builds/web/dist/e4033d6eb1ae90b9d2bcb7cb6bf8cd6a-v2.js | 173 KB | 169 KB (98%) | ✓ | 3rd |
| https://static.sketchfab.com/static/builds/web/dist/03097b3b7092b581e4a09196735c38a8-v2.js | 168 KB | 123 KB (73%) | ✓ | 3rd |
| https://static.sketchfab.com/static/builds/web/dist/da8ed87c0adc4ddd8992e5e8cbf906fc-v2.js | 0 KB | 91 KB (64%) | ✓ | 3rd |
| https://static.sketchfab.com/static/builds/web/dist/da8ed87c0adc4ddd8992e5e8cbf906fc-v2.js | 142 KB | 91 KB (64%) | ✓ | 3rd |
| https://static.sketchfab.com/static/builds/web/dist/5bcaa88525fab96faffe19e1ce66716c-v2.js | 58 KB | 44 KB (77%) | ✓ | 3rd |
| https://static.sketchfab.com/static/builds/web/dist/bc8e3f5f2b678b1def38df63f34ce14d-v2.js | 41 KB | 25 KB (63%) | ✓ | 3rd |
| https://static.sketchfab.com/static/builds/web/dist/bc8e3f5f2b678b1def38df63f34ce14d-v2.js | 0 KB | 25 KB (63%) | ✓ | 3rd |
| https://static.sketchfab.com/static/builds/web/dist/c8ad894ab8fc8b1964bd28bfbd8d62d7-v2.js | 38 KB | 24 KB (63%) | ✓ | 3rd |
| https://static.sketchfab.com/static/builds/web/dist/c8ad894ab8fc8b1964bd28bfbd8d62d7-v2.js | 0 KB | 24 KB (63%) | ✓ | 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 InventoryAction113 resources · 2.4 MB · 823 KB savings availableFIX
~823.1 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 113 resources | 2.4 MiB | ||||||
DHTTP CachingActionno-store (uncacheable)FIX
max-age=0, no-cache, no-store, must-revalidate, private
| Directive | Value | Meaning |
|---|---|---|
| max-age | 0 | Cache for 0 seconds |
| no-cache | — | Cache but always revalidate first |
| no-store | — | Never cache this response |
| must-revalidate | — | Must recheck with server after expiry |
| private | — | Only browser cache, not CDN/proxy |
CImage OptimizationAction23 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
CJS Execution CostAction1373ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://static.sketchfab.com/static/builds/web/dist/2501372c81883da32e6bfa6564e8fd3f-v2.js | 665ms | 584ms | 2ms | 3rd |
| Unattributable | 254ms | 2ms | 0ms | 3rd |
| https://sketchfab.com/ | 149ms | 10ms | 0ms | 1st |
| https://static.sketchfab.com/static/builds/web/dist/3cdac9d105b7f0d540bfe0d56266acb8-v2.js | 143ms | 141ms | 0ms | 3rd |
| https://static.sketchfab.com/static/builds/web/dist/da8ed87c0adc4ddd8992e5e8cbf906fc-v2.js | 110ms | 49ms | 30ms | 3rd |
| https://sketchfab.com/models/99bfe75ebd734fa3832a63e02e2cacf7/embed?annotations_visible=0&autospin=-0.1&autostart=1&camera=0&double_click=0&internal=1&max_texture_size=1024&orbit_constraint_pan=1&orbit_constraint_zoom_in=40&orbit_constraint_zoom_out=60&preload=1&scrollwheel=0&sound_enable=0&transparent=1&ui_animations=0&ui_annotations=0&ui_ar=1&ui_ar_help=0&ui_color=white&ui_fadeout=0&ui_fullscreen=1&ui_help=0&ui_infos=0&ui_inspector=0&ui_settings=0&ui_stop=0&ui_theatre=0&ui_theme=dark&ui_vr=0&ui_watermark=0 | 52ms | 1ms | 0ms | 1st |
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 Loading10 fonts (325 KB)PASS
Web fonts
10
325 KB total
Render-blocking
0
of 10
Dominant font-display
swap
Most common across fonts
Font loading timeline
- 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 ~5 KB and ~10 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
Network Waterfall113 requests over 2054msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
static.sketchfab.com static.sketchfab.com | Other | 665ms | 21 KB | — | €11/mo | Costly |
Unattributable Unattributable | Other | 254ms | 0 KB | — | €4/mo | Costly |
static.sketchfab.com static.sketchfab.com | Other | 143ms | 5 KB | — | €2/mo | Optional |
static.sketchfab.com static.sketchfab.com | Other | 110ms | 0 KB | 64% | €2/mo | Optional |
These scripts may cost more than they're worth
- static.sketchfab.com adds 665ms and costs ~€11/month
- Unattributable adds 254ms and costs ~€4/month
85% 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
static.sketchfab.com takes 665ms 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 254ms 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 static.sketchfab.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