As long as a villager is going to or from the nether, chunk updates are frozen. As soon as the villager finishes going to the other dimension, all chunk updates that had been suppressed happen at the same time.
I had a video, but it was too large, so I'll just explain what happened:
I placed the villager in the portal, attempted to spawn more villagers with spawn eggs (Nothing happens), and attempt to power a piston with a redstone block (No activation). Upon the villager going into the nether, all the other villagers I spawned appear at once, and the piston extends
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I don't think this is a duplicate. The game works fine (45 fps is good for my computer), the only thing affected are the chunk updates. MC-117914 talks about an FPS drop.
Asteraoth
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Let me check for TPS lag
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Indeed, it seems that there is HUGE TPS (No client-server interaction while the villager is being transfered) Also, this seems to work with other mobs but they go to the nether instantly.
I still think that the two bugs are different, as the issue itself talks about FPS drop