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> a Raspberry Pi is not quite powerful enough to handle a gigabit connection

To clarify, you're referring pretty much exclusively to the PiVPN part here, correct? I have a 3B doing lots of other things and it's serving Pi-Hole duty as well w/o a hitch.

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Oh yeah, Pi-Hole itself almost doesn't cause any CPU load. But connecting to the PiVPN slows things down considerably. I probably need to do some benchmarks to see exactly what's slowing things down, now that I think about it.

The 4 should have true gigabit?

I don't think the bottleneck is the ethernet itself. The CPU might not be powerful enough to handle the VPN connection at full speed.

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