SiteStats
Just saw an email from Clay today about SiteStats and User Presence. I'll quote:
We want SiteStats, but with a minimal performance hit. We are currently running with presence turned off, for performance reasons among others, but SiteStats requires having presence turned on if it is to track site visits.
The trouble is that in the interface the site visits chart is front and center on the overview page, and it of course will stubbornly show zero site visits (and use a pretty graph to further illustrate this nullity), which will doubtless be confusing for our instructors, or make them think it's broken.
We had the same issue, and since we didn't have resources to modify SiteStats and we had a small pilot group, we decided to turn presence on, at least for the short term, at just hide it from users, in case we decided to remove it later. (We also received anecdotal reports that presence wasn't as big a performance hit as one might think). However, Nuno says he will be working on a fix for this: