I recently upgraded from 4.6.1 to 4.7.1 and have found that the DIH process that we are using takes 4x as long to complete. The only odd thing I notice is when I enable debug logging for the dataimporthandler process, it appears that in the new version each sql query is resulting in a new connection opened through jdbcdatasource (log: http://pastebin.com/JKh4gpmu). Were there any changes that would affect the speed of running a full import?
Thanks! - Jonathan Hutchins