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the weak link for RPi boxes is the fact that it uses an external drive and weak memories.
If you get a decent box with fast and reliable memories and a good internal drive, you never have any problems with the node. CPU is not so important but that doesn't mean it could be a slow one.
Eh, it's probably time to upgrade my hardware either way.
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I've tried to reproduce the rpi4 issues on an odroid M2 but cannot. So the issue still seems specific to the rpi4.