Since the native software of my Kobo aura is so buggy that always crash with certain EPUBs, after reaching a specific page I finally decided to follow the One-Click Install Packages for KOReader & Plato. I installed both KOReader and Plato.
I started trying KOReader. Needless to say it works like a breeze, and as far as I can tell it is quite faster that the native, buggy, crashing KOBO Reader