
"Your Galaxy Watch is not so different from your phone or even a messy room. When put to great use, it, too, gets cluttered. By continually using your Galaxy Watch, regularly switching between apps and functionalities, or running too many apps at the same time, you're bogging it down with data that clutters it and slows performance. This results in slower performance, frozen screens, and an annoying user experience."
"It temporarily stores your smartwatch data (or junk) and, in this half-baked analogy, considers that data when you log into sites or perform regular tasks. Just like a garbage can, it gets filled with junk after a while and begins to overflow if not properly handled. You eventually have to dispose of the junk in a dumpster to add more junk (or data) to the can. Clearing your cache removes some of that junk that's making the garbage can (Galaxy Watch) performance laggy."
Galaxy Watch units collect cached data from frequent app switching, background processes, and heavy usage, which consumes available memory. Cache buildup can cause sluggish performance, frozen screens, and increased battery drain. Clearing the cache removes temporary files and junk data, restoring responsiveness without replacing the device. System-driven memory optimization runs automatically, but manual cache clearing can yield immediate benefits for lagging watches. The cache functions as temporary storage for login data and routine tasks, and it can overflow if not managed. Regular cache maintenance provides a simple, low-risk way to improve watch performance and battery life.
 Read at ZDNET
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