Windows 10 computers when they join a multiplayer world they lag and cause the world to pay but when they leavethey the Windows 10 player can barely move while other players have delayed responses like if you break a block it takes like 5 seconds for it to appear and when you try to take damage you it takes five seconds and then it either gives you too little damage.
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We are experiencing this as well. We had our world hosted on a Realm and it was lagging horribly for everyone all the time, does not appear to be player event driven for us. We thought it was network lag because it was effecting everybody so we downloaded the realm and tried playing locally. For the network players they experience laggy response but for the host it is complete UI freezes and extremely high CPU utilization. It appears to be periodically triggered as it will spike for awhile then clear up then start again. There are about 7 threads starting from ucrtbase.dll!o__realloc_base+0x20 that take up all available CPU when the hanging starts. I have an 8 core CPU and it's taking over all 8 cores. I've removed all resource packs and it hasn't had any impact.
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I'm also experiencing this issue after updating to 1.1 on Windows 10 version both on realms and on local multiplayer games. It seems to be associated with going through the nether and players joining the game. Nether portals cause the game to crash for the player using them and extreme lag for other players. Hopefully mojang can fix this issue in the next update.