As of the past few days, my world (16.7GB size) has suddenly started to have a massive memory leak. When the server starts, ram usage starts increasing rapidly and reaches around 8GB by the time the world loads. Upon joining, the ram usage starts going upto 16GB to even 30GB. 

I have tried loading the world onto single player and the same memory issues can be reproduced. 

Download link for the world: https://mc3.mcchosting.co.uk/world.zip