I am rendering 4k on a Ryzen 3990. ~1500 frames (10 cameras).
1 HDRI is the only light source, lots of proxies.
Very small camera movement only, no animation, the content is essentially the same on each frame.
Im using a noise tolerance (7%) and denoising (90).
I see a few seconds added to each frame time. Not the first time this has happened, but this project will go to a commercial farm (Rebus) and I dont want to burn my credit unnecessarily. If I suspend the render then restart it on Backburner, the frame time drops to the original frame time and begins its creep up again, frame by frame. After 35 frames it is +50% over frame 2.
Ive added some images below to describe the problem.
Any help much appreciated.