I've been trying to get my head around how smoking food has changed in 3.63. The question I have is how large a fire is required in order to keep the process ticking along.
At first I thought that we would need to have a continuous fire for a few hours in order to fully heat up the fireplace, and I erred on the side of overdoing it. I tried various combinations of firewood and branches to get the fire to the level of either 'burning for a few hours' or 'burning for several hours'. The smallest combination in my haphazard trials was 5 firewood and 20 branches or thereabouts. I had no meat spoilage doing this, even if I missed a day (I would then make a larger fire, e.g. 80 branches, to make up for that).
Since I had no spoilage, I thought I was overdoing things, and this is a significant amount of firewood to go through in midsummer. Also, as far as I can tell the fireplace heats up even with the minimum fire (16 branches, or 5 firewood and 1 branch). So now I'm trying to see what happens with the minimum firewood. Now I'm getting spoilage. At first I thought it was that I had misjudged the boundaries between days and inadvertently missed one, but I get more spoilage the more that a batch of meat has been smoked during my 16-branch fire regime. The bits that were mostly with my large-fire regime and only a few days of 16-branch fires only had a little spoilage; my last batch that was entirely done during the 16-branch fire regime had ~40% spoilage. So, something is going wrong.
Is it that the 16-branch fires are too small? Or is it something with the timing of the checks, and my pretty haphazard schedule of lighting fires (while trapping, active hunting, building a cabin, long trips, etc.) means that the small fires doesn't have the margin of error for smoking that a larger one does? I've frequently lit a fire in the morning, left my settlement, and come back and lit a fire at night the next day. Perhaps this is now a no-no without lighting large fires. I presumed that the game would do a check at 8am each morning whether the fireplace was heated since the last 8am check. But that is just a presumption.
Another issue is that I don't understand the details of how heating a fireplace now works. It may be that 16-branch fires are too small to properly heat the fireplace. Maybe there is now a continuum of how hot a fireplace gets, and my ~40% spoilage is because a 16-branch fire only gets to ~60% of the necessary heat. In this case, the question is 'how large a fire is needed to fully heat a fireplace?'. A wrinkle here is that the game describes as a 'heated room' a room with even a minimum-sized fire that has just been lit, which is what emboldened me to try 16-branch fires.
I would need to do more systematic testing to come to any kind of conclusion. In the meantime, I thought I'd ask the other players, you, what your experiences and meat-smoking regimes have been.