After updating Krakatoa render time increase

Hello, I try to open an older Krakatoa file in the newest version of Krakatoa using 3D max 2020. The render time of the older file (using an earlier version of Krakatoa) was for each frame 50 seconds. While rendering the same frame with the newer one is 1,5 minute. The hardware I use is the same. The rendering times are only for sorting and drawing the particles. I noticed one difference during the rendering. Before the sorting official begins there is an period where the pc is in idle before beginning the sorting. 3D max is flashing a couple of times before beginning the official sorting process. In the older version there was also a period before the sorting that he does that but much much shorter. So the question is why does he do this and how can I fix it? I hope someone can help me.