As I mentioned before in this thread application performance has improved after the v15.0.4.2064 release. But the issues that I started this thread for have not:
1) freezes are really a pain to deal with everyday.
2) Also the "initializing..." when changing tab connection
3) and "executing..." that doesn't go away unless I close the tab

I have made some suggestions in this thread about windows energy saving settings or oracle client incompatibilities etc being of influence, but have not seen or heard anything about this. Any ideas? Above issues are really frustrating and have been there fore quite a while...