Minecraft wiki entry for Nether_survival, associated text: With a slower computer, the player may encounter a massive lag spike upon entering the Nether. The workaround involves doing the following: after the player steps out of the portal, turn on the F3 debug info, then Esc to pause the game. Note the "Chunks Updated" line—even while paused, the game is continuing to load chunks and update them. It is wise to also note down the coordinates of the portal. The player can then wait for the chunk updates drop to zero, meaning the game has finished loading the region around them. Then the player can resume play. This trick is also useful when the player changes their render distance.