I used RPR to render a 240-frame animation of 4 tears dropping down from eyes. Eyes are just a texture on a plane, tears are 4 spheres following simple nurmbs path. So on a frame 001 it took about 9 sec, but after frame 180 i noticed that it takes 28 seconds to render a frame. Watching closely I saw that there is that weird pause before PRP gets actually rendering. And every next frame that pause gets longer and longer. Now i am at frame 235 with 47 seconds of render time. What the hell is going on? I render to mp4 H.264 format.