Downloading complete Gmail directory

I have been testing eM Client and am really liking the results, especially when compared to Outlook with G Suite Sync.  My college uses G Suite for Education which has our complete directory.  I honestly have no idea how many entries are in the directory.  What I do know is that everytime I do a refresh, I get a little over 200 more entries downloaded from the directory.  I’m up to over 100,000 so far.  As long as I keep hitting refresh or just leave the client running with auto refresh every so often, I keep getting more and more.

My question is whether or not it is known whether this 200-ish per refresh is an eM Client choice or a Google limitation, and either way, if there is a way to raise this limit to speed up getting the whole directory.