Sets the size of a single tile. If a child panel is larger than this size, it will occupy several tiles.
If you are setting the size of the children properly then you probably don't need to change this.
1 number size
The size of each tile. It is recommended you use 2<sup>n</sup> (
16, 32, 64...) numbers, and those above
4, as numbers lower than this will result in many tiles being processed and therefore slow operation.