Thanks Guys, The slow query log has a lot of entry's in it. It's not obvious which are causing the most issues but I have found a script that was always slowish so have removed it. The line read # Query_time: 5 Lock_time: 0 Rows_sent: 3 Rows_examined: 17286222 No idea where it thinks there are that may rows... A script which outputs all the active users from radcheck shows this in the slow query log # Query_time: 0 Lock_time: 0 Rows_sent: 84 Rows_examined: 32992 Are all the slow query entries potentially a problem, I mean should there be any entries in there at all? While the scripts have changed slightly this DB worked fine on the last server - could it have been corrupted from the sql txt file import perhaps? (via phpadmin) Regards Carl