I used a wrong mode in PNGOUT, so the filesize is a little bigger : \

But I found PNGOUT(with gui PNGGauntlet) is very funny. Sometimes Xtreme is faster than intense , and another time the "faster mode" can got the smaller size than "fast mode"..

And I found the time it costs looks randomly.. Maybe depend on the pictrue. I remembered a 10+M one cost me more than 10min with Xtreme mode.

I heard of that if png compression level isn't same, there are very slightly difference among decompression speed.
Is it true?

They are very different..

The Intense & Xtreme mode always cost several times of time than huffman only & longest match mode.