What is the best way to place animation on the site?

Question

3D

So, colleagues, there is a 3D animation for the landing page as a visual and icons. Animation is cyclic 2-3 seconds on each element (total 6 animated objects).

Attention, the question is: how best to place on the site without sacrificing optimization and download speed? Pure 3D using libraries? Third party handler in real time? Sprites? GIFs? Other tools? Please, help. Now the question is whether animation is rational and whether there is a chance to implement it painlessly