I sometimes open PDF's and then want them "sort of" open "to read later", but I'm not looking at them at the moment. While I'm not looking at them I'd like the OS to spend less effort keeping them up.
In other words I'd like the OS to allocate resources away from some
evince windows and toward other things I'm running.
I just learnt of
dtach in another context. Is either
renice an appropriate program to "downshift" the processes I'd like to deprioritise? I've looked at some of the documentation but since this is perhaps a nonstandard usage of the tools I can't tell if they're right for my goal.