Of course! KB is a measure of space. The higher it is, the more space it takes up, the longer it'll take to load.
However, I don't understand what you mean about how it gets bigger when you save it over and over... I can do that now and it's all the same size. Are you sure the format's not being changed? I could understand maybe a little change due to file compression. Compressing a compressed image can make it larger at times.
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Desktop * Athlon X2 4200 | 2G RAM | 160G HD | 7600GT
Laptop1 * C2D T5550 | 3G RAM | 120G HD | Intel x3100
Laptop2 * C2D T5250 | 2G RAM | 160G HD | Intel x3100
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