Tesla Inc (NASDAQ:TSLA) has shared a video showcasing its Optimus humanoid robot walking at its fastest pace yet, with a 30% speed increase since December. The improvements include enhancements to the robot's vestibular system, foot trajectory, ground contact logic, and motion planner, contributing to its stability and confidence, especially during turns. CEO Elon Musk expressed optimism about delivering some units of Optimus next year, despite acknowledging uncertainties. The main challenge remains making Optimus capable of performing useful tasks, with the goal for it to start contributing in Tesla factories by 2024.