CPU runing with rhinoceros

i have 2 computer with different config.
Configuration 1: 2 cup xeon E5 2680 V2, ram 32Gb, Graphic P4000
Configuration : cpu core i7 7700 , ram 32Gb, graphic GTX 2080 Ti

When The project open in 2 cumputer, configuration 1: cpu max 4% and too lag. configuration 2: cpu max 15% or more and show good.

I don’t know reason?
Please help me explan them