when playing minecraft near large structures the game will freeze

when playing on a large custom world, the game will have a tendency to freeze and will not respond. when checking crash reports it says:
[19:20:19] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 2051ms behind, skipping 41 tick(s)
. I have tried to force quit and reload the game, but to the same response.