Method... well the method Faery_Light found with a google search is a way of changing the PNG image from 'true color' to a 'paletized' image, although it's called 'posterize'. All these things can be done with photoshop, or paintshop. Try that.. i.e. reduce the color from true color to say, even a 32k color pallete. The difference is striking. Try a 256 bit pallete, unacceptable.Whatever method you use to set the compression level of your PNGs, bear in mind that since the compression is lossless, you won't lose any quality even if you use the highest level (= smallest file size). The downside will be that the highest compression will take a little longer to save and load, but it shouldn't be too bas even so.