Hello! remember to optimize each piece of the armor with zremesh. When you do the panel loops function, also remember that, depending on the resolution you want, do not use too many subdivisions in the "loops" option.
Simply work according to the pc you have. If it is not very powerful, do not subdivide the pieces very much.
In any case, the process of more polygonal load is in the final part, when putting the alphas. At that time, do not make too many subdivisions to the model, instead of working with 5 million polygons, work with only 2 million. You must learn to work according to what the PC allows you to do.
I hope it helps. Regards!