The hosting of the image is not the problem, it's the size of the file. It takes quite a bit of load time for those visiting this topic or others for the first time via any dialup. Future times it may be cached depending upon how large a user keeps his cache.
The size of your sig (45k) is huge for a sig button, so please consider those with slower connections when using an image in your signatures.
Personally it doesn't effect me, because I use a cablemodem.
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