If I use a bunch of small tilemaps that overlap each other, I'm guessing it will render slower than using one larger tilemap? I assume each tile will get rendered even if it is completely behind/occluded from another?
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Repeat a 32x32 tile is 100 times lighter than repeat a tile 64 x 64 50 times. For only has the weight of an image.
https://www.scirra.com/manual/134/performance-tips
https://www.scirra.com/blog/83/optimisation-dont-waste-your-time
https://www.scirra.com/tutorials/37/beginners-guide-to-construct-2