"Mudkipz, no, I'm not going to edit the water and lava to be still. First of all, it's 100% unlegit. Secondly, I don't even think it would make any difference on the performance. The blocks themselves may be still water, but if the surface isn't even, the water will just flow off the edges of the still water blocks, and then we will have about just as much floating water as before."
So i know you like to keep stuff legit, and this might be considered unlegit. However, this doesn't give me any advantage or benefit, it just prevents lag. Also, i don't know what you mean by even surface, but if i do not touch the blocks or any block surrounding them after construction, there should be no flow.