2. Quicker NPC exchange !
Adjust your exchange window so that the the [ + GO ] button and the "Do you really want to exchange" [ Yes ] button stacks on top of each other as shown below
this makes your mouse movement efficient, instead of moving your mouse to looking to find that tiny yes button (and sometimes mis-clicked them), now you can just click [ + GO ] twice in a row since the [ Yes ] button will be on the same place.
I used this a lot of times for exchange npc such as like Miranda Watty, GM_Wan, and Lorena.
you can click Go+Yes multiple times before the item distributes, you get multiple transactions issued so the exchange would end up being 2~3x faster.
no this isn't a glitch, its just lag, the items exchanged are still 1:1.