ship with low power profile as default to reduce CPU usage

[autonome]

Is your feature request related to a problem? Please describe.

I consistently see IPFS using ~5-11% CPU while I'm not interacting with it.

Describe the solution you'd like

Ship w/ low power profile as default.

Describe alternatives you've considered

Not running IPFS typically reduces the CPU usage to zero.

Additional context

Apparently humans are not 80% water. It's a myth.

[lidel]

The lowpower profile itself does very little:

https://github.com/ipfs/go-ipfs/blob/beaa8fc29b472214283b9aab884ed92f03908d13/config/profile.go#L177-L183

			c.Routing.Type = "dhtclient"
			c.AutoNAT.ServiceMode = AutoNATServiceDisabled
			c.Reprovider.Interval = "0"

			c.Swarm.ConnMgr.LowWater = 20
			c.Swarm.ConnMgr.HighWater = 40
			c.Swarm.ConnMgr.GracePeriod = time.Minute.String()

Peers behind a nat will be dhtclients automatically, and they need autonat for circuit relays and hole punching.

We can't use lowpower profile because it would disable Reprovider which would break data providing local data to the network :)

The only thing we could tweak compared to the current settings is to decrease ConnMgr values – i opened #2055

[lidel]

@autonome try updating to https://github.com/ipfs/ipfs-desktop/releases/tag/v0.20.4 – it uses lowpower ConnMgr settings (and migrates your config if you already had some high values specified), which should close unused connections faster. Less connections means less bitswap traffic, and that should improve CPU/bandwidth when idle for more than 1m.