[DCP-o-matic] Very slow MacPro encoding

About 4 fps in a 12-core MacPro, configured with the default 24 threads. We have seen much better speeds in this same configuration. Tested with MKV and Prores sources, with some image modifications, and no modifications at all. Also tried on a network, with the MacPro as an encoding server and the laptop with the project not doing any JP2K encoding. Slightly lower speed as expected. The server log at the MacPro was giving about 5 seconds per frame, tha seems pretty high to me. I recently installed the latest test version 2.11.16, and trying to troubleshoot I tried with the also installed stable version from late December, with same speed result. Are OSX packages statically compiled? or installing the newer test version may have "damaged" some library shared with the older version? Anyone else have or had a similar problem? Thanks! Manuel AC