Thank you amjoie for that info. I'll gladly add that to my list of possible causes for lags.
I have to agree with WR about MOO. Use with care. To place stuff without being restricted to the grid, use the ALT-key. It's a lot better. Never place stairs or doors with MOO, very bad idea.
I found that with pets, lots of spiral staircases became an issue, you have to turn them to make them usable again and in a world I tested, people used a fancy method of making an entrance with archways. While that does look very neat, it's actually bad. If you do that, you have to place walls so you can put in the arch. This makes the actual front door an 'inside door'. While your own Sims can use that just fine, the visitors are getting confused, especially if use a porch as well. In that world, I had a Sim constantly stamping their foot cause they couldn't ring a door bell since the house had no front door.
If you have a back door, that will become your front door for the visitors. The mail man might get confused too. In Starlight Shores there is actually a house build like that and I daresay that can lead to routing issues as well.
As for deleting Sim, I find Total Anniliating with Twallan's mods no issue at all. Deleting with moo or testingcheats is indeed a bad idea but I'm unsure about sending them clipboard diving. That should not be an issue in my opinion. I've cleaned out SV that way before and did not get any problems.
As for stuck cars after resetsim *: Stuck cars might not get cleaned by Overwatch. You have to manually delete with the testingcheats cheat. So make sure you check your hoods for them. I've also had stuck cars with drivers in that did not get cleaned out by Overwatch (Note to self: Ask Twallan about that).
