When you click the flag, two sets of 100,000 random keys (with duplicates) will be generated. Clicking on each broadcast will compare the time it takes to use either a list or costumes to turn all 100,000 dictionary keys into a list number. The first two only have 9 possible keys. The second two have 64 possible keys. All of them test 100,000 randomly generated keys.
This is a speed test comparing different methods of accessing dictionary values. Dictionaries are like lists that use text instead of numbers to access items. They are useful for things such as a PTE engine's font. The test results seem to show that using costumes is faster than using lists when there are a large number of keys. The time varies somewhat, so the one to use could depend on the situation.
