The login in 9.x is much slower than with 8.x
My backend is Oracle 11g and my client, too. This was the same configuration with 8.x, but with 9.x it is very slow.
But more painful is the slow switch between different windows, e.g. from on one open package to another or a sql window. This took at least 4 seconds which is a very long time when I want only to switch between two open windows. In the Debug.txt you can see a delay of 3 seconds where nothing happened (see red marked):
20.10.2011 14:46:01 NavigationBookmarks.EnableButtons(Rebuild)
20.10.2011 14:46:01 NavigationBookmarks: Backward=1, Forward=0
20.10.2011 14:46:01 AddNavigationBookmark starts
20.10.2011 14:46:01 AddNavigationBookmark GNV00002
20.10.2011 14:46:01 NavigationBookmarks.EnableButtons(Rebuild)
20.10.2011 14:46:01 NavigationBookmarks: Backward=2, Forward=0
20.10.2011 14:46:01 AddNavigationBookmark ends
20.10.2011 14:46:04 Lock
20.10.2011 14:46:04 Lock
20.10.2011 14:46:04 UnLock
20.10.2011 14:46:04 Lock
20.10.2011 14:46:04 UnLock
20.10.2011 14:46:04 UnLock
20.10.2011 14:46:04 NavigationBookmarks.EnableButtons(Rebuild)
20.10.2011 14:46:04 NavigationBookmarks: Backward=2, Forward=0
20.10.2011 14:46:04 UpdateChildList [timer]
20.10.2011 14:46:04 DoUpdateChildList
20.10.2011 14:46:04 Lock
20.10.2011 14:46:04 Lock
20.10.2011 14:46:04 UnLock
20.10.2011 14:46:04 UnLock

This behavior we didn't have with 8.x.

Also opening the package in a editor takes several seconds, in Oracle SQLDeveloper the same package body opens within one second.

In general all actions have become very slow. When I do the same (open table definition, open package body) with Oracle SQLDeveloper on the same database it is much faster, so the connection cannot be the problem.

The behavior is the same with Multiconnection On and Off.

Any Ideas?

Can you let me know your exact PL/SQL Developer version?

PL/SQL Developer
Version 9.0.2.1621
Windows XP Professional 5.1 Build 2600 (Service Pack 3)

Parameters
C:\Programme\PLSQL Developer\plsqldev.exe

Preferences
Session mode: Multi
OCI Library:
Use OCI7: False
Allow Multiple Connections: True

Preference Files
C:\Programme\PLSQL Developer\Preferences\Default\Default.ini
C:\Programme\PLSQL Developer\Preferences\<UserName>\default.ini

Plug-Ins
*Active Query Builder (C:\Programme\PLSQL Developer\PlugIns\ActiveQueryBuilder.dll)
*PL/SQL Developer CompareSource Plug-In version 2003/12/03 (C:\Programme\PLSQL Developer\PlugIns\CompareSource.dll)
KPO Connection manager (C:\Programme\PLSQL Developer\PlugIns\KPConnectionManager.dll)
*PL/SQL Documentation (plsqldoc) (C:\Programme\PLSQL Developer\PlugIns\plsqldoc.dll)
Red Gate Deployment Plug-In (C:\Programme\PLSQL Developer\PlugIns\RedGate.dll)
SaveSeparate v2.0 (C:\Programme\PLSQL Developer\PlugIns\saveseparate.dll)
*User-defined Export 1.1 (C:\Programme\PLSQL Developer\PlugIns\TextExport.dll)
*TNSEditor Plugin (C:\Programme\PLSQL Developer\PlugIns\TNSEditorPlugin.dll)
*Version Control Interface 1.2 (C:\Programme\PLSQL Developer\PlugIns\VCS.dll)
(* is Active)

Homes
Ora10g (C:\oracle)
OraClient11g_home1 (c:\app\<UserName>\product\11.2.0\client_1)

DLLs
c:\app\<UserName>\product\11.2.0\client_1\oci.dll

TNS File
c:\app\<UserName>\product\11.2.0\client_1\Network\Admin\tnsnames.ora

Using
Home: OraClient11g_home1
DLL: c:\app\<UserName>\product\11.2.0\client_1\oci.dll
OCI: version 11.1
Oracle Database 11g Enterprise Edition Release 11.1.0.7.0

Character Sets
Character size: 4 byte(s)
CharSetID: 873
NCharSetID: 2000
Unicode Support: True
NLS_LANG: AMERICAN_AMERICA.WE8MSWIN1252
NLS_NCHAR_CHARACTERSET: AL16UTF16
NLS_CHARACTERSET: AL32UTF8

Thanks, we will check it out.

Hello, I have similar problem. Is there any solution for this?

Are you using the current 9.0.3 version?

I'm using 9.03 and also have this problem.

I have the same problem with 9.0.1.

same problem with 9.0.6.1665