I currently have a fort with 110 dwarves in 3 different styles of rooms. I never have problems with fps, I am always in the 60-100 range, though I may go lower when I tell my dwarves to clear the rock from the royal rooms, then it dips severly as all the dwarves path to their precious little rocky friends.anyway, my rooms are like this:
The Noble House
nobles get ornate, styled rooms designed to conform to the natural curves of wherever they may be. my baron has a stone floor, and clear glass windows with a view out into the river. he has made friends with a salmon, I don't know how.
The Villa
the classic 3x3 room, shaped, based on, and made (mostly) by workshops. they are distigushed by three things, denoting the importance (or luck) of the dwarf who resides ther. these three things are:
a coffer: only the most prestigeous of my dwaves get these tricked out villas. Legends among the populace, like that stonecafter who made a boot, or the retard with the leather hammer.
a cabinet: This is the second highest non-noble room a dwarf can get he or she now has the ability to store the materwork pig tail sock they stole from the dead fisherman.
a bed: yay. you can sleep.
the cottage
this is a simple 3x2 room, set up to look square as apposed to the more common rectangle. humble, and good for the dwarf who works, but not that much.
The Hovel
a 1x3 room stick, you lazy bastard. look forward to all the hauling you'll do.
The WTFZOMGBBQ Room
sometimes, I just can't leave my dwarves the hell alone. Sometimes, I get bored, and when I get bored, bad things tend to happen. Or good things. Those can happen too. Usually, this is the room that looks like some drunk dwarf smoked some rat weed and decided to carve out his own room. this room is usually occupied by the dungeon Master. Or the philosopher. Or the Prophet (Got to Have one. He does the rain dance!) It is also ingraved with CHEESE!