Hello,

I have found bug in the new 1.10.0 version of the game, it has become an issue for game performance, with random LAG spikes and the time it takes to open some menus. 

How it happened. I gave all the entities the new item ‘the shields’ with this command. 

/replaceitem entity @e[type=!players] slot.weapon.offhand 1 shield 1 

After I clicked enter the game froze for about a minute and then the game crashed. I then opened the game back up and clicked on the save, I got in the save and then it crashed after about two seconds. Then I loaded the game back up for a second  time but this time it didn’t crash, so I swiftly killed all the entities with a command. Ever since then the games performance has not been great. I think the save is now corrupted.