[DCP-o-matic] Sad DCP-o-matic performance under Ubuntu

Hi there, After being unhappy with the Windows 7 Professional 64 Bit running on my new old Dell-box (updating all the time, running wild with strange processes etc.) I installed Linux. Tried an old DELL 10.x install first, but that that did not have the necessary dependencies for DCP-o-matic. Upgrading to version 12–with some complaints by the installer–let me finally add the package, but it would not start DCP-creation. Putting a new 14 on the box failed, but I could do a clean install of version 12. Major performance increases? DCP-o-matic encoded at a little over 1 fps, as opposed to >10 under Windows. OK, it is using about one of the 24 cores available… Upgrade to v 14 was painless, but the performance has not increased. Does someone have an idea where I might be going wrong? The BIOS settings seem to be OK. Multicore and multithreading etc. Is there some setting I have to do in some Linux app? When I use the systems analyser I can see periodic activity of all cores with v 14, but that is just a wide spike, and after that it is back to crawling speed. And this setup should run so much better. I am a bit frustrated currently, but not enough to download try to read the source code ;-) Any ideas anyone? Many thanks in advance, Andrew