So, playing the most recent version in Dwarfmode,
On my normal 3x3 map I never had any Fps issues with such small number before. At about 80-100 dwarfs and 40-50 livestock it falls from 150 to 100 with all doing something and flowing water with rain or sandstorms, first cave opened and used.
Now I got a fort of about 40-50 Dwarfs and a livestock of about 28, from which only 10 are roaming freely to kill vermin.
But in this game my fps are jumping down to 50 when everybody is working and even if not it hangs at around 100, first cave open, but sealed. (no flowing water, no hidden siege or anything else special)
I also get this DF Hack spam, too, which is new, maybe it has something to do with my fps issues?