Thanks, it makes a lot of sense but, honestly, given the power of nowdays cpus and the available amount of RAM in today workstations, I don't really feel the need for it, especially as it creates a new step in the workflow in term of editing the textures, as .TX files aren't directly editable in PS. So it's unlikely I will start using this format, unless the rendering speed gain is significant.
What is the average rendering speed gain?