Just having an empty scene with a 20x20 fully visible terrain in it. After experimenting for ages, I found the following fps on my device: 9-12 textures added: 10 fps 5-8 textures added: 14 fps 0-4 textures added: 25-40 fps The terrain always uses only 2 textures, no matter how many I added. There aren't even normalmaps added. How can that be? All textures are the same, there is no heightmap (all flat) and the least possible resolution in the terrain settings. It can't be that this is only my phone, I assume this is a Unity performance bug. The terrain data is less than 80kb, textures are 256x256. HW specs: Motorola Razr Maxx (from 2011), 960x540. Unity 5.4.2f2 I know that my friends with newer phones do absolutely not have that problem (constant 60). But: there seems to be a bug, if you ask me, and I have no idea how much performance that will cost in general.