Seems to me that a turn based game doesn't need a high fps. :roll:

In any case, here's a few general things you might want to look at:
- using 256 colored graphics will help some.
- using 8bit color mode will help even more
- limit the drawing to the visible parts of your game.
- don't use alpha blending
- don't use canvas.fill(0) if your screen is already filled with tiles
- don't use standaard texts (ie. canvas.textout)
(- decrease the resolution, 1024x768 is too much for DelphiX)

Perhaps you can post a few screenshots. It might help a little to see where the problem areas are.