I have been experiencing a lag while moving from one chunk to another at certain places in the world. I noticed it at a couple of places near my initial spawn point. This is in Single player mode
Few notable things:
Cobblestone walls seem to be a a factor. Both the places had cobblestone walls and on rearranging the wall layout at one of the places, the issue got resolved. On the other location, it isn't feasible for me to remove the wall, so I haven't been able to test it.
It is a persistent issue. It has been logged in many places by different players and seems to happen often. But, I didn't experience it earlier (at those locations) so I am hoping someone has insight into what can be done to get around it.