Everything is cached nowadays: Instruction branches, registers, memory, disk, database query results, proxy responses, DOM, GUI elements. Most data gets cached

Everything is cached nowadays: Instruction branches, registers, memory, disk, database query results, proxy responses, DOM, GUI elements. Most data gets cached at multiple levels already. In any system, wether poorly or well designed, one may discover that hardcoding responses to high-level/networked queries indeed improves performance. So it becomes tempting to duplicate the application response in front of it. Though without much concern wether duplicating the application outside of it is a good idea in that specific case, or not.