my suggestion, and probably the suggestion of A LOT of others, is to log the stat history so that we can get an accurate record without having to leave the page up all day.
1) I didn't want people to visit my stats once and then forget about it, meanwhile the stats continue to be downloaded. This was a waste not only for me storage wise, but for wafflepool and myself's network usage.
Maybe only log for 24 hours, and if the person has not checked in, then stop logging that address.
4) I figured that since people had their PC's on mining all the time anyways, if they wanted historical stats they could just keep the page open somewhere.
It does slightly lower the mining rate on the rig with the window open.