[map] The end

This is a a discussion topic for the map "The end" by tnkqwe which can be found here

Map description:

If you have played Minecraft, you will be able to figure out what am I trying to recreate. I decided to make things less blocky.

The proportions are not correct- everything is bigger that it should be. But I usually make this mistake when I start a new map from scratch.

Still, I'm satisfied with it so far. All I need are models of an Ender-man and an Ender-dragon.

You can see the different stages of the development of the map here: http://www.moddb.com/members/tnk-x5000/images/guess-the-idea5#imagebox

I haven't visited the site in like... forever. But now I have found out that I need some help with this map- it's pretty laggy from where the picture is taken. Question is how to make things easier to calculate for an average gaming PC from 2010.

Map screenshots: