Draw images doubt

Java on Mobile Devices J2ME
#1

Someone know why paint a image in tiles is much slower that paint a whole image?

Example:
If we have a scene with 20x20 tiles and the tiles have a size of 10x10, then it have to paint a total of 200x200 pixels.
In a nokia 7650 it repaint at only 4-5 fps, but if we paint an unique image of 200x200 then it repaints at 65fps.
With the nokia emulator of series 60 happen the same.

Thanks

#2

drawing 400 10x10 tiles is naturally a slower operation that drawing a single 200x200 tile.

However, its the API itself that is is to blame mostly, as there is a huge overhead within the drawImage method.

The fewer times its called, the faster it’ll be.
(regardless of the size of images drawn)