Render starts of normal then slows down

dark-reach

So I've gotten this issue, probably since the new nvidia update for the release of 30 series. Where my renders have started taking more time and seem to slow down when there is just a few percent left to render.

Renders I make in 1080p took about 20-30 mins, now it takes about 1 hour or even 2 hours. It all started this Thursday, the day before that I had no problems.

I have a 2060 super and Ryzen 7 3700x.

Does anyone else suffer from a similar problem?

Richard Haseltine

It's not at all unusual for progress to slow or speed up at various points - it isn't a measure of how much time has passed, or how many iterations, but of how many pixels have reached their "final" state (according to Iray's calcualtion). A tricky bit can sit there not finishing for a while, while a broad, well-lit area might converge quickly. I'm not sure why an updated driver would affect that, if you are comparing the same scenes.