App cache can be a controversial topic on Android. Many people clear their app cache religiously, with the belief that it will keep their phone from getting sluggish and avoid unnecessary buildup on their phone's internal storage. Others say it defeats the whole purpose of caching in the first place, and just makes your app startup times and other activities take longer. The reality is somewhere in the middle: some apps may not use caching efficiently, causing it to use unnecessarily large amounts of storage. Or, it could be that an app's cached data causes problems when that app receives an update.

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