Water / Lighting causing framerate drops.

If you will see this forum: http://www.minecraftforum.net/forums/minecraft-discussion/recent-updates-and-snapshots/2205517-i-think-i-found-the-source-of-the-lag

It describes an in-depth description with proof, that water and lighting effects aren't optimized and are causing framerate issues. I, myself have been noticing the same bug. Walking past or near lakes, oceans, rivers, waterfalls, ect. causes immense, annoying framerate drops. There are screenshots and line graphs in the forum that shows precisely how to framerate drops have been occurring.