These 3 pop up often enough with a considerable size.
On a popular server, which has a fairly large database it seems that periodically updating the shop prices takes a large amount of network data. I included an example where it is almost 600KB big. This should normally be a very small amount. I've seen it hit 1000KB: {F641}
The other 2 have the same thing although they appear less frequent. I've seen the keynamebuffer reach 100+KB. The network statistics file uploaded on this issue is one of the "normal" ones I see often on a popular server: {F642}