Fast Switching: Caching to the Rescue

The term cache in the computer industry usually refers to the concept of storing some frequently used subset of a larger data set in a local storage area with very fast access properties. A computer might keep a local copy of frequently accessed parts of a file stored on disk in RAM, for example, or a CPU might prefetch some instructions into a very fast associative memory area to boost performance. The two key characteristics of such a cache are a relatively small size as compared to the entire data space, and the capability to provide very fast access to any addressable member of its contents.

The IOS developers used these concepts when they created the Fast Cache. The Fast Cache quite simply is a data ...

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