Lag and other Strange issues on a multiplayer server

Since the update a multiple server has had large lag issues affecting mining and chest access, when trying to access a chest it takes up to 2 minutes to open and during this time the pov seems to zoom and unzoom a number of times,  also at time players are taking damage as if they are drowning or trapped in a block when just walking around on the land surface.  

there has also been a couple of instances of the character starting to swim on a floor surface and unable to interact with anything when on solid ground