I tried to delete and recreate the container, but there's still this insane power consumption.
For comparison, cloudflared doing a tunnel to hundreds of users takes 0.06% of CPU time on the same server
this post was submitted on 22 Jul 2023
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On my machine it's consuming about 0.5% - 1.0% of cpu time, which is higher than zerotier in the same machine (almost zero).
Tailscale does a lot more things than just tunneling though. For example, on default installation it'll catch all outbound dns request on the machine and route them through MagicDNS (100.100.100.100).
That's weird. I closed the docker on that specific machine (ryzen 5), copied the docker-compose directory (=same config) on an i5-6500T and now it's using just 0.1% of CPU time.
Go back to ryzen and it's 8% again 🤷
One thing you could try doing if you feel up to it is to build Tailscale from source code. Often when built for your specific machine, performance improves.