2D world building questions

Unity Engine
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1

I have a few questions about building a 2D map akin to Zelda.

http://www.zeldacapital.com/Games/maps_alttp/light_world.png

I have a 1x1 polygon plane and a texture atlas.

I guess that if I use hundreds of polygon planes to make a map its going to chug on some devices? So I can cut that down by using Arrays and Triggers to load the bits of the map that the player is on. This is the simplest thing I can think of.

I guess the background on something like Zelda is just drawn onto the background somehow without any polygons being used?

Dose anyone have any pointers?

2

Also, I have a match game with 4 objects and when I build my grid I have about 64 Calls and 77 Saves.

But when I try and be smart and just use 1 object and 1 texture and use texture offset I have 142 Calls and 0 Saves.

Shouldn’t it have gone down?