I was looking at the page sizes, and noticed that the wikipedia.ico file is 15KB, which is about 14% of the average m. page size. Unfortunatelly, this download is not reported by either firefox or chrome dev tools due to know bugs, so it might have been overlooked in our site performance review.

Can we shrink it somehow? Or is there a reason to keep it as is?

I tried shrinking it with GIMP to 4bit - and got a 5x reduction. There are some color changes, but I don't know much about images, so possibly some pixel hunting by a designer is needed. Also, I tried 4bit+PNG option, which might not be supported by every browser, especially some mobile ones, and it got me an extra 569 bytes (21%)

Lastly, do we really need 3 different sizes - 16,32,64? Can we do 16 & 64?