What picture format is best

I did a quick test to find the smallest picture format. I drew a drawing in paint and saved it as a png, jpg, and gif. The file sizes have a large range.
jpg = 158 KB
gif = 84.2 KB
png = 12 KB
It appears that the png is the smallest by far. Does this mean it will be faster to use with a java program? Should I be using png exclusively? Are there reasons to use the other formats?

So you don't care whether the pictures look like crrap, you just want them to load fast?
Is it show-stoppingly important that a picture loads in 0.11 seconds rather than in 0.17 seconds? You would really sacrifice picture quality for that speed improvement?
Now note that these are all made-up numbers. That's because there are a variety of things which might affect the speed in which a picture loads, and you haven't told us about any of those things. The amount of disk used to store the pictures is only one of those things, and not a particularly useful thing either. Unless one of the other things is that you're transferring them over a 300 BPS dial-up line.

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