Ok I will send log file tonight, anyway the DVR project is very simple because is only a test: a 4K clip, with a LUT applied, scaled at 1080p. As I wrote, export to a similar codec (dnxhd) is faster, around real time. Vokoder prores take 5 times.
A info: if I encode on the same PC a prores file using ffmpeg is a lot faster.
Plugin uses prores_ks which is closer with bitrates etc. to official encoder and ffmpeg default ProRes encoder is prores, which is way faster than _ks version. Use prores_ks in ffmpeg then then compare times.