Using the vanilla 1.14 pre-release 2 server from Mojang, when a player enters a portal, other players will rubber band back to the point in time when the one player entered the portal once that player makes it to the other dimension. This happens when going both from the nether to the over world and from the over world to the nether.
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Johnibur
This issue has been reported and maintained in MC-117914
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This is far different than the 1.11.2 issue ilmango reported!
I know nether portals are particularly laggy. They always have been. But this is different than that. It shouldn't freeze the server entirely until they make it through the portal, then everyone rubber bands back to the exact spot they were in when the player first entered the portal, with all the blocks they placed or broke brought back 3-4 seconds. TPS dropping for a few seconds is no biggy, but a complete freeze.... that's going to be terrible for larger servers!
Johnibur
It's better to focus our efforts on reporting the same issue on the same ticket. Even if the issue is worse in 1.14, fixing it will mean it will be no longer be an issue at all, no matter from what version you came from. Moreover, Mojang has recently started to track MC-117914, which means they may fix it before full release if they have the time.
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Fair enough, I'm just concerned that if they haven't fixed it since 1.11... they're not taking it very seriously. And understandably so, because it wasn't really game breaking, just more of a performance issue. But I'm glad they're now finally tracking it... maybe this helped catch their attention, that it's now escalated to a game breaking bug, rather than just a performance issue.
violine1101
I have experienced this (or a similar issue) in single player, I needed to wait about three minutes for the Nether to load in. This did not happen in previous versions, and MC-117914 was created a few years ago. I therefore believe that this issue is separate from MC-117914 and this ticket should be reopened.
However, I haven't been able to reproduce this issue in any way while /debug was active. We need that debug file in order to prove that this is a new issue. If anyone who is experiencing this issue could attach a debug file generated by that command while the issue occurs, that would be very appreciated.
Johnibur
@unknown Mojang is currently aware of this issue and they answered that they are currently trying to improve portal code.
And I have posted a profiling dump for this issue in ticket MC-117914. And that's the ticket that has been directly addressed to Mojang. If fact, solving this issue for 1.14 means the old one will implicitly be fixed as well. The main goal was to attract Mojang's attention about the issue, which is done for now.
*Also, our server hasn't made it to the end yet (huge lack of mobs), but I'd guess the issue will happen no matter the dimension a player is switching to.