The integral equation coarse-graining (IECG) approach is a promising high-level coarse-graining (CG) method for polymer melts, with variable resolution from soft spheres to multi CG sites, which preserves the structural and thermodynamical consistencies with the related atomistic simulations. Taking advantage of the accuracy and transferability of the IECG model, we investigate the relation between the level of coarse-graining, the range of the CG potential, and the computational efficiency of a CG model.