Is there a faster way to interact two items with each other, similar to dart fletching or using a chisel on a full inventory. Been using interact() function, have also tried using mouse to click certain square. Is there any way to speed up the interaction ?

Pretty sure it depends on your onLoop return value. Make it smaller and it should process the tasks quicker.

 

create a new mouse event and execute it

You didn't post your code so we don't know how to improve it.