Crop the Images to the size you really need.
Put as much bitmap graphic as you can into the background û
the background image redraws much faster than other objects.
The tool Combine objects with background in Arrange menu can
help you.
Big images with alpha transparency can slow down the
application
For 256 colors û you have the palette.bmp file inside the
Palette directory.
You can use this image to extract palette inside your graphic
editor. All your graphics should use colors from this palette.
Convert your pictures with your graphics editor to 8 bit
with using this palette.
For Corel Photo Paint there is already palette prepared inside
the MMBÆs Palette directory.
Reduce the size of the project.
Click Reduce size from File menu.
This will remove all unused temporary bitmaps from the project.