[arch-general] What dirs are good to put in a tmpfs?

[Chris Moline]

Hi, I have 7 GiB of ram but I'm only using 300 MiB, so I thought I
would put stuff into it to speed up my system. I installed
anything-sync-daemon but I have no idea what to sync. Is there a tool
that can tell which dirs are being used the most? I'd rather not guess
and benchmark, I don't have the patience for that. What are common
dirs that would benefit from being in ram?