I think you dont need to optimize it this much for lan. It depends on what pc's are in your network. if there are a realy wooden one you might get a problem if you let do it the clients but if your server-pv isnt strong enought you also might get "lags"
with modern pc's I cant imagine there is anything you need to do. I have not done this much with 3dgs just some tests but if you dont try to connect with to much people(I think a lan game won't make it up to 10-20) you wont get problems if you just write it as you wish.
Just end your work on it and try a test will help better than 100 posts here
(but you could tell us your experience)

lomacil