Performance issues
MC-4890Chunks re-send on death, even when nearby
Important
MC-5169Huge FPS drop in areas with a lot of signs and hanging signs
Normal
MC-5417Large amount of chests and shulker boxes creates FPS drop
Normal
MC-5805When the game is paused, it still uses lot of CPU
Invalid
MC-7895Large amount of fences impact performance
Normal
MC-44385Server lag: Running 20215ms behind, skipping 404 tick(s)
Invalid
MC-64223Terrain generation causes very slow chunk loading
Invalid
MC-65587Lag spike while loading player head textures/player skins
Fixed
MC-80880For some entities Motion gets always calculated regardless of value
Confirmed
MC-90062Server spams "Player/Vehicle moving too quickly" to the log when players are using Elytra/Boats or flying at max. speed
Awaiting Response
MC-93967The smoke particles of the explosion are displayed when Particles option is set to minimal
Fixed
MC-95535Multiple hopper performance issues
Normal
MC-96120Console Spam: Something's taking too long! 'root' took aprox 916.461492 ms
Awaiting Response
MC-96207Boat breaking lily pad creates too much particles
Fixed
MC-99601Commands that fetch game profiles cause lag when fetching a player that wasn't before on the server
Normal
MC-104726End gateways and portals cause huge amounts of lag
Low
MC-109087Faces of some blocks are not at all culled when said face is hidden by a solid, opaque block
Low
MC-112341Right clicking blocks and entities on a server sends 2 right click packets instead of one, with the exception of villagers
Awaiting Response
MC-117914Entities crossing dimensions through nether portal causes tremendous lag
Fixed
MC-118106High CPU usage, lag and poor performance on dedicated / integrated servers
Cannot Reproduce
MC-123584Updating blocks creates lag spikes proportional to geometry in chunk section
Important