Refresh Slow Nexus 7 by Wiping Cache Partition

My Nexus 7 is getting slower after running for 10 months. At first, I thought it is related to too many running apps. But there are plenty of available RAM in [Settings]→[Apps]→[Running], I don’t think it’s time to get a new tablet with more RAM. Limited storage? I still have more than 3GB free in [Settings]→[Apps]→[Download].

If it’s not related to RAM and internal storage, what’s up?

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