Prepass getting slower over time

[yeeha68]

I dont know if this is a bug or not. While rendering a very quick set of frames for a white box animation prototype I noticed that my render time was increasing per frame. This was attributed to the prepass that seemed to take a bit longer every time. I eventually tested this with a non-moving frame and rendered 0-1000 so that I could be sure each frame was identical for time measurement. The first frame was 16 sec. By the time I got to 300 the time was 30 seconds and it kept going up. I even dropped it into backburner to get a recorded time record. I cant figure out whats causing the prepass to slow down. I just upgraded to 3.40.02 and did not experience this issue before. Does anyone have suggestions?

Using Max 2014 sp5, Vray 3.40.02
-k