I posted a while back about the new Data Mining Add-ins for Visio and Excel that were created by the SQL Server team. That is one of the more popular posts on this blog, so I know a lot of people have been downloading them. If you have, please note that there is a performance update to the Add-ins. This was released in April, so if you downloaded them after that you should be up to date. This also does not actually impact the Visio functionality -- the fixes were on the Excel side.