Tested in new world and old world.
Problem happens earlier in old worlds.
I tested it with this Command:
/particle happyVillager ~ ~5 ~ 0 0 2 0.01 10Commandblock is in repeat-mode (activated via Redstoneblock).
In old worlds you need only 5 Commandblocks running this or any other Command like /testfor @e - in new worlds it needs up to 20 Commandblocks.
It needs vom 30s to 5 min to have those lags.
When the lags appear Mobs seem to be in slowmo.
commandBlockOutput is false
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OK, done - funfact: this time it was al little harde to reproduce the situation. It seems i am not the only one, who experience this issue. Hope Mojang will fix this, otherwise Adventuremaps and Server with some customization are history. This would be realy bad.
Outdated graphics drivers. Please update to 361.43.
I think this is tied to another ticket (#MC-94438). I don't see lag on worlds with no mobs, even with hundreds of repeating command blocks (not that these are particularly interesting worlds).
It seems like Command-Blocks, which are running do make this problem much faster visible (the lags occour earlier), so yes my problem may relate to 94438.
Please attach the complete output of the "Game Output (Your Minecraft name) " which can be found on the fourth tab of the launcher to this ticket.
If the launcher closes after game start, please edit your profile and select "Launcher visibility" then, "Keep the launcher open".