Reduce `Vector3` allocs

[dotaxel]

Since i added the Vector3, i never think about the fact every frame im creating tons and tons of them every frame, from the modifiers backend to the renderer.

Having a Vector pool its not trivial too, i think... Instead we cant just avoid creating them as much as possible, maybe also optimizing Vector3 op code, also if it is possible we could make it a struct over an abstract? So we could keep Vector3D compatibility? IDK