Well, AFAIK it does not work like that. We can never get rid of the swap. And (again) AFAIK the first pages to evict when there is no enough RAM, are executable pages. But when that code page is needed again it is better if it is on the faster media, that way multitasking will be better/smoother. Also have in mind that executable pages NEVER go to swap, so we don't know (at least not easy) what part of the executable code is in RAM, and what part will be read next time it has to be executed. That is the rationale behind my attempt to move Qt to a faster (as I was thinking) storage.

Now it turns out this (rootfs is faster) is an urban legend. Not only that, but it consumes CPU time too, so most probably soon there will be an update which will move Qt back to /opt