When night comes, NPCs will run at extremely high speeds to get to the nearest house. As if they had a speed II potion on.
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They move in one speed in 1.5.2 and now they move as though they have speed II on them.
I only see them do this when they go into a home, otherwise, when doing nothing or even being chased by a Zombie, they are fine, so this is confirmed on my end. Way too fast than they were before, and I didn't see this in the change-logs in any snapshot.

Stil in 13w42b.
Oddly enough in 13w42b I'm noticing this during midday. Some villagers act normal, yet some run around like baby villagers, and run in and out of houses. Switching to peaceful does not fix it, so they don't seem to be fleeing? Also, not raining or even getting dark.
I'm experiencing what insomiac_lemon noted in 1.7.2 - it is day time (any time, including high noon) and the villagers are all sprinting around. Difficulty mode (including peaceful), resetting the client, and leaving the area/returning does nothing.
Is this still a concern in the current Minecraft version 1.7.4 / Launcher version 1.3.7 or later? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.
Confirmed for 14w02b. They will do this even during daytime, the moment they decide to go to a house, and also walk rather fast even when they aren't doing anything in particular.
Is this still a concern in the current Minecraft version 14w19a / Launcher version 1.3.11 or later? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.
Confirmed for 14w27b.

Confirmed for 1.8.

Confirmed for 1.8.1-pre3
Maybe partwise intended (maybe they get scared 🙂 but the current speed is way too high)

Seems strange because they don't run nearly that fast when running from a zombie, but do when nightfall comes and they look for a house, even if no zombies are even close to the village and the area is completely lit up.

Confirmed for 1.8.1.

Still an issue in 15w34a.
I also want to go home sometime. Someone save me.

@unknown: The issue now is that villagers run extremely fast when getting into houses, but slower when actually escaping from zombies or illagers (which seems to be reversed logic, they should be more afraid of zombies than the night itself). I made a ticket with code analysis at MC-121175.
Working as intended.