YAST Network Settings Larg Host File

When using large/larger hosts file and attempting to open Network Settings, Network Settings “hangs” or the start up slows to a crawl.
Does anyone have an explanation for this? This clearly has something to do with the hosts file, if i replace it with the original it opens quickly. Doest Network Setting in YAST read the hosts file for any reason? What is going on here? Can anyone shed any light on this???