Thanks @ Megaltariak & Droll.

Very helpful..going to try later..fingers crossed!

Note that personally, I use swap only on internal memory (the default) because my microSD is too slow, so my script is written for this use and only use the memory card as a temporal swap (but don't worry, it is easy to change it to make it work for dual swap configuration)

Anyway, the mandatory step is to create a swap partition on your microSD, I would recommend a ~768MB one, don't forget to make a backup before