When plsql developer is "resumed" after changing LAN settings, it takes extremely long time to "activate" developer. It freezes for 30 sec (or minutes sometimes...)

Its very uncomfortable when :
- I use various VPN during my wok, when I disconnect VPN, I have to wait for developer to "wake-up" to refresh local oracle connection.

- I left PC with (connected) developer, then PC hibernates, and when I come back to PC, {C resumes fast, but I have to wait for developer to "wake up". Its no reason for this behavior.


Edit: Just for clarification:
when this situation occurs (plsql "hangs" doing something) I'm able to start new instance of Plsqldeveloper, which connect to the same oracle connection very fast and I'm able to work with this instace (the first original instance is still "doing something", UI is freezed)

I have the same observations. And yes it is annoying.

Can you check if this is resolved with the 64 bit version?

Yes, it's the same for 64bit. And the problem occures even without switching VPN or any network settings. It is only occurred when a VPN connection is used.
Just open Developer, use to make some calls etc and then leave it for an hour. When you come back it "freezes". If you have open windows for several DB connections, then it freezes each time you open a window with new DB connection that hasn't freezes already. I mean 3 windows with 3 DBs will lead to 3 consequential freezes for 30 seconds.

To obtain some more diagnostic information, can you modify the shortcut and add the DebugSQL parameter? For example:

"C:\Program Files\PLSQL Developer\plsqldev.exe" DebugSQL

Reproduce the problem and send me the debug.txt file that is generated in the PL/SQL Developer directory or in the %APPDATA%\PLSQL Developer directory (e.g. C:\Users\<User>\AppData\Roaming\PLSQL Developer).

Was this cause of this problem ever identified? I am suffering with it too.

It's usually a client configuration issue. Can you go to Help > Support Info and send me the text from the "Info" tab page?