Locality
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
State
A processor repeatedly visiting the same memory locales has locality — spatial when access runs consecutively, temporal when data or instructions are reused — and it buys speed.
Show
Two lists added front to back, and a loop rerun thousands of times, exercise both kinds.
Watch for
Locality is written into code, not granted by it.