VAT animations in 5.3 with blending and baking. VAT lowers CPU cost making animations calculate on GPU and u don’t need to have a skeletal mesh, only ISM. Good for crowds and RTS games, mobile and with proper order of animations, transition works as great as a blendspace.
https://dev.epicgames.com/community/learning/tutorials/bq5v/unreal-engine-vertex-animation-texture-tools-blend-transitions-and-more