Investigate memory usage between different ways to add content

Create different presentations and compare memory & CPU consumption and created buffers between them.

At least these should be incuded:

• one layer
• two layers
• one layer + one subpresentation with one layer
• one layer + one subpresentation with two layers
• one layer + two subpresentations with one layer each

Content should be minimal and comparable in each one (i.e. same number of shaders needed, same number of textures if any, and so on).