Sorry, not a native English speaker here, might need to reformulate that to: "you might want to change the swappiness" 
For me, as you can read here: Pihole v6 on low spec hardware having swap with "default" settings resulted in slow DNS responses (webinterface is also not lightning fast, but works). After some very helpful discussion, I ended up disabling swap and running everything from the limited amount of memory (128M).
This caused the pogoplug to go out of memory every now and then ... so, to mitigate that, I activated swap again and (after some reading) lowered the swappiness. This seems to work for now. Although I am not sure how much longer we will be able to keep these things alive.