One comment on this mod.

First of all - N9 (and N950) is not using any storage device (neither eMMC nor OneNAND) for swapping. It uses an in-memory compressed swap (ramzswap) instead. So, there should be no noticeable application lockups.

Second thing - the "from the factory" setup was tested for an average end user usage scenario (can't tell exact details, but it's pretty wide in terms of the apps used in it). As the average can be quite distant from some particular user's scenario, that user can see some improvements (or otherwise) after applying this mod.

No magic, just statistics.