MapleStory/Latale Equipment Programming

All Maplestory images are packed into the .wz files and loaded into the memory when needed. Each image has associated data that tells the game the relative x and y coordinates at which to draw the image, any rotation that needs to be applied, and what layer on which to display the image. Once an image is loaded into the memory, it's really easy for the game to pull the image and draw it where it needs to be. Games with loading screens use the load times to prerender images to reduce lag while playing.