I got new workspace (new computer) and PL/SQL developer startup went slow. OS and PL/SQL version is the same.
I added command line switch: DebugSQL and it shows:
2012.09.19 09:40:11 Logon2 starting
2012.09.19 09:40:11 Logon2.Execute starts
2012.09.19 09:40:59 Logon2.Execute done
2012.09.19...