I reached 50 hearthlings in my settlement and they seem to be doing okay, game version 0.20.693. I did need to remove shadows completely and reduce lights at night down to 12 (probably more to do with my graphics card than anything else). But the stuttering seems minimal unless there are too many events going on at once, i.e. fighting in two places and building something and harvesting/mining lots of things, in addition to the normal hauling of items.
I was unlucky in my stats and didn’t get very many good soldiers throughout the whole run. I only ended up with 15 and the last two hearthlings became soldiers. There were one of each crafter, with 2 cooks. I had 3 trappers, 4 shepherds, and 5 farmers. The rest were workers.
I learned that moving the animal feed production to the top of the cook’s list is really needed for egg and replacement-animal production. LOL I wouldn’t have needed that 4th shepherd (for a second chicken coop) if I had realized earlier why the egg numbers were very low.