Long-time Android power users will be all too familiar with the “clear cache” option in recovery, but thanks to some recent changes to how Android works, the cache partition is a thing of the past. Here’s why.
Traditionally, Android would download an update, store it on the cache partition, and then apply it to the system partition when the device was rebooted. This process takes a little bit of time, then the OS has to “optimize” after the reboot is complete in order to clean up the installation. It’s not a bad system, per se—it’s just not as efficient as it could be.