if you are animating a HUGE number of skeletal meshes… you might also consider using vertex animation on static meshes instead… baking skeletal animations into vertex displacement textures which can animate static meshes using their materials. It might be exactly what you are looking for 
There are videos online showing how to do it… I’ve done it and it’s certainly possible… you can do it manually or there is at least one toolset on the marketplace which may make the process quite a bit simpler: