> Png compresses badly when the image contains too many different colors.
Old trick to squeeze a few kb out of a png: Use Posterize filter from Photoshop, with very light settings. Basically it will just flatten the number of colors.
Nah, just use Photoshop's "Export -> Save for Web (Legacy)", then set the file to PNG-8.
Now you can mess around with the number of colors in the color table, customise the color palette selection algorithm, dithering algorithm and dither amount.
Old trick to squeeze a few kb out of a png: Use Posterize filter from Photoshop, with very light settings. Basically it will just flatten the number of colors.