[dwwoelfel]

A search at searchyc.com turned up:

"There's a background process that runs every 45 seconds and picks a random loaded user to update the average of. Empirically, not more than every couple days, at best."

http://news.ycombinator.com/item?id=1875738

[nkassis]

I must be really unlucky, mine has been the same for a few weeks.

[revorad]

mine too