This one is pretty self explanatory, I learned it from a friend while I was claiming 999 stacks of all the new anniversary vendor decorations.

Instead of standing around with your inventory open and waiting forever to claim decorations individually by clicking, you can drag a stack of decorations to a free hotbar slot and use the assigned-keybind OR rebind the Hotbar Slot to Mouse Wheel Up or Down (mouse scroll) simultaniously to rapidly claim hundreds of decorations a second.

Best part is you can close your inventory and go about your day, the keybind for claiming decorations doesn’t even effect combat so if you get a GF/PvP pop you can enter and continue claiming your stacks even in combat (as long as you can multitask ofcourse).