Hi, i experienced a little problem while rendering animations, using Direct Light. I have one scene, an interior, with some octane cam (five) and no objects movings.
Image is pretty good with no many samples (about 1000-1500, there is just a little noise in some area, i denoise this in postprod)
My render time with two 580 are between 1 and 2 min per frame, but sometime after first image was rendered (even if i start rendering at frame 150) , the next ones are ultra fast : my full animation is complete in few second

but are frames rendered like with 100 samples. But if i close then restart max (2012 x64), that's rendering well. I've see this problem three times this weekend, with dozen of five-six second animations.