[artemon]

Can someone here clarify something for me what is the difference between fast and slow?

Slow collects both hidden items (levels 150 and 145). Fast only collects the level 150 hidden item, otherwise it collects the level 139 item that is always there.

For example, Fast collects Radiant Lightning Moraine and Lightning Moraine. It will ignore Bright Lightning Rock.

Slow collects Radiant Lightning Moraine and Bright Lightning Rock, otherwise it gathers whatever is the highest on the list, usually a Cluster.

Slow makes more efficient use of GP and doesn't miss any hidden items. The main disadvantage of Fast could be solved if the Gathering module supported three or more items.