Image Load vs Cache

Caching means loading data from the computer's storage device (SLOW) to the computer's memory/RAM (FAST) so that the game can be as smooth as possible.

Elephant demonstrates proper caching - the GreenfootImages are all loaded in the World's constructor and loaded before the user presses play. Elephant2, on the other hand, loads images each time it needs one, and is a lot more resource intensive.

While the difference is not evident in this simplified scenario, the performance difference is significant, and this will start to make a big difference once your program increases in complexity.

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