MarianT,
I've been playing my single save file for awhile not knowing that I was doing rotational play. I've been playing this for quite awhile now with the Patel's, Holiday's, and four other families along with my original Sim that I built for the initial game, so that makes seven families total.
I basically moved all the sims out that I wasn't playing and kept the houses empty, in fact I bulldozed the original houses since I enjoy building in this game. Building a house as the family goes through it generations gives the a bit of history. I just kept the families that I was interested in, pulled a few 'unplayed' sims in to satisfy a cousin problem I was running into. Currently the Patel and Holiday family is into their sixth generation, soon to be seventh. I had no major problems as of yet (knock on wood). With the genealogy, the family tree gets quite interesting.
I play with aging set to long time span, this gives me ample time to spend with most of the Sims, but I do concentrate mainly on my original Sim family. I keep a spreadsheet of all the sims and produced some story lines as time goes on. I like this style of play because when you see the other sims, around parks and other venues you know who they are. I must admit though keeping relationships is the most frustrating aspect of this style of play, since upon returning you find the child's BFF is no longer in her relationship list. I was hoping the MCC mod would fix this but it appears to only work on the existing family being played.
The families are spread across the different neighborhoods, of which most are located in the new neighborhood of Newcrest. I abandoned Windenburg but kept the venues, three families were added from that expansion, the Villareal, Fyres, and Bjergsen. Theses three families are in their third generation are are like a half generation apart from the Holidays, and other original sims.
I play matriarch style in naming, since that is the game's default and I pretty much allow the game do the naming of the babies. I don't age via CAS, for it retains the number of days, if I want to age up a sim, I use the birthday cake, for it sets the days to zero. This almost messed me up.
Reading these posts was quite interesting, for I'm pretty much been doing what was described in your first post. I haven't checked my game save file size, probably something I should look into, but I'm not experiencing any lag. I do get a few sim resets, but I been seeing those occur since the beginning.
I'll be keeping up with your thread, its nice I'm not alone.
Thanks. z