To speed up a pose in Mixamo, use the "Speed" slider in the editor to increase playback rate before downloading—this preserves the original pose while making movement faster. The slider scales speed (e.g., 1.2x, 2x) without changing keyframes, so the pose’s shape and timing stay consistent. For natural results, start with small increments (like 1.1x) to avoid choppiness and keep the flow smooth. Preview the adjusted speed first to ensure it fits your needs, then download the faster animation.
