- Reduce amout of iterations per frame by pre-collecting the ground items on game tick - Collect ground items in ground item plugins and pre-compute some easy-to-get values - Replace the looping over all tiles with looping over collected ground items - Change GroundItemOverlay logic to support single list of items instead of multi-dimensional array Signed-off-by: Tomas Slusny <slusnucky@gmail.com>