In 1.8 there is massive amount of lag caused by water rendering.
I can run a superflat world just fine but when I run into a village that has water in it, or an ocean in a normal world i get massive fps drops.
Environment
Windows 7 Ultimate 32 bit, Nvidia GeForce 9200, 4 GB RAM, 1 GB Alocated to the game. Java 8, jdk 1.8.0_05.
Not a duplicate of MC-45458, this has nothing to do with the hardware setup.