Found the solution for the problem on my PC. The problem was Outlook. I am running Office 2010. I also discovered that other programs also have this problem/issue, but the pause/freeze is not so long as in PL/SQL Developer.

Today the Microsoft Exchange Server was offline so I just closed Outlook and then suddenly PL/SQL Developer was working as it should. When I started Outlook again the problem was back. I do not know why this was working on my old PC.

I can confirm that closing outlook also fixes the problem for me too.
But I need to have outlook open :-(

Hello,

is there any solution for this problem?

With Outlook 2010 running cut&paste is extremely slow...

Closing Outlook is no solution for us...


Regards,
Marc

Unfortunately we have not yet been able to reproduce this or find a possible cause.

I can confirm the existing of the problem with Outlook 2013 too.

No other editor had this issue so it's maybe some special API that you call on copy handling.

I'm experiencing the same issue and it is really annoying. I did notice that the problem is not as bad when I do a "copy" from within a "grid" (e.g. results grid). It only pauses for a fraction of a second from the grid but there is a about a 3-4 second pause when copying from anywhere else (SQL Window, Program Window).

Please try to figure this out.

Thanks.

I'm experiencing the same issue, with outlook 2010 (word 2010, excel 2010 are the same, in one word, all applications of office 2010 ) running, the copy or cut is extremely slow. Can any one know how to fixed this issue? Thanks in advance.

I confirm that closing Outlook 2010 solves the problem. Well spotted!
The freezing time varies between 1s in the morning up to 5s in the end of the day, but the whole performance of PL/SQL Developer degrades as the day progresses, switching between windows is slower and Copy freeze times also increase.

Using version 9.0.6.1655

>Unfortunately we have not yet been able to reproduce this or find a possible cause.

To help reproduce this, I have:
-Windows 7 (x64)
-Machine in a domain
-Outlook 2010 (v14.0.6129.5000 (32-bit))
-PL/SQL Developer 9.0.6.1655

Also, I noticed that Special Copy (C#, C++, etc) always works fast. You must be doing something differently on those commands, and that might help track the problem.

You may want to check if "Include font style with Copy" PL/SQL Developer option (in: Tools / Preferences / User Interface / Fonts / Editor) makes any difference.
You could also try clearing your Office clipboard and/or try changing it's settings. This link may help you find the Office clipboard window:
http://www.addintools.com/documents/office/where-clipboard.html