Performance benchmarks:

This is related to #2638 and #2642.

I need to think about the best way forward to address this. Yes, we can add a bunch of if statements as done here. However, I am inclined to see this as an architectural problem. At the moment, we don't distinguish carefully between drawing the space (e.g., the grid structure), the drawing of properties of the space (i.e., property layer portrayal), and the drawing of agents within the space. These are effectively all collapsed into a single draw_space method. I am inclined to redesign the API and explicitly separate these three things slightly. If you pass the same axes (in the case of matplotlib), you can draw them on top of each other, but if you pass separate axes, you can also portray them more cleanly. Any thoughts on this are welcome, preferably in #2642.