[Performance] Improve marketplace detail page initial load time
Symptom
The first load of marketplace item detail pages takes 3–4 seconds. Screenshots load all at once, delaying LCP.
Measurements
- FCP: 1.2s
- LCP: 3.8s
- Total images: ~4.5 MB (5 images)
Operator note (in progress)
- ✅ loading="lazy" applied to screenshots (LCP down to 2.4s)
- 🔄 Marketplace API response cache TTL in progress (target: 5 min)
- ⏳ WebP conversion deferred to the next milestone