as with any compound cut piece, they are going to be slow going. you are cutting thick material. Another aspect you may not be thinking of; you may think, "yeah, but I have cut 1.5 inch material before and it didn't seem this hard" (just guessing). typicly when cutting on material, you have a larger piece to hold onto and push thru the blade, but with the chess pieces, you are holding a much smaller piece of wood, thusfor using your finger to do the work that you are usually doing with your hands.
See what I am saying?
Small compound pieces are always a bit more difficult. Maple is a hard dense wood, it is going to be difficult to cut.
Stick with it, you will get it