Network Topology Mapper - Auto Arrange Diagram makes NTM not responsive and slow

Recently I have been using NTM version, it seems to work fine when the number of nodes are about 150-180 but when I have to scan a large network it finishes the scanning but everytime I try to auto arrange the diagram or make some changes to it the Software becomes irresponsive and usually takes about 15 + minutes to recover. I have run this software on even a 42 core CPU but very similar results, is there a way to make this work faster ?