RT Anza (@anza_xyz)1/ SIMD-0337 introduces block markers, paving the way for Fast Leader Handover in Alpenglow. This enables leaders to optimistically build blocks on tentative parents, minimizing delay by changing leaders. Block production starts ~120ms earlier, improving IBRL by ~7.5% 🧵 https://t.co/QcaZSc8n1i ...