Hey, I'm all for the harder difficulty, but the way disasters (radroaches/fire) spread is downright stupid here. I had a radroach infestation occur in my warehouse, which I placed in the center of my floor (for safety reasons like this), with 2 occupied rooms on the sides. The moment the radroaches appeared, I instantly selected the closest dweller to go there. The dweller first takes a few steps to the OTHER direction for some reason, then makes its way to the warehouse, then POSITIONS itself, and by this time the radroaches already spready to every other room directly connected to it. Fortunately this was easily taken care of by the occupants, but this is just downright stupid.

My reaction time on this was virtually instant, but the dwellers' reaction time is downright tedious here. Can you at least make it happen that Dwellers start dealing damage the moment they enter a room (you know, just like Deathclaws, Raiders, and everything else do the moment THEY enter a room?). Again I'm all for a challenging difficulty, but not if the game's own design actually prevents me from overcoming said challenge. Either have dwellers respond a bit faster when they are sent to a disaster, or have disasters spread around just a tad less fast to compensate for the dwellers' idiotic positioning mechanic.

I agree, the speed at which they spread is daft. It wouldn't be so bad if the UI response was instant, but you often spend a couple of seconds trying to select a dweller in the first place!

I've stopped sending dwellers to defend or firefight unoccupied rooms. They take too long to get there, and they face insurmountable odds. The threat increases with room upgrades, and I fully upgrade my unoccupied barracks, warehouses, and production storage. By leaving dwellers in whatever un-upgraded room they happen to be, they can easily defeat the threat when it spreads there. The next logical step is to segregate unoccupied rooms starting two levels down from occupied levels, separated by a dirt level.