Render speeds much slower with 4.9.4.117?

aaráribel caađo

I don't have a Nvidia card—and have a laptop not designed for 3D work—so I usually render over night and rarely get more than 1500 iterations. Since I upgraded to 4.9.4.117, I've rendered two scenes and they've finished with much more noise (and many fewer iterations). I don't have a benchmark for the before, but the render I just ran for 8 hours finished with >250 iterations for a scene with a single G3F (plus an instance) in one of the GIS hallway props retextured with Iray materials. The previous render that ended with even fewer iterations after more time was a single G3F in a simple boat on a water plane with a physical sun. The memory load on these wasn't too high, since I was using legacy, low-map products for most stuff and the scenes are farily minimal, nor was there much geometry—all things that usually produce a fast, high-iteration render. One variable that's different from my usual renders is that these were rendered out a ~30-50% larger than I usually render.

I haven't rendered these scenes before (and don't track render times beyond glancing at the numbers), so I don't have a scientific knowledge that render efficiency has dropped significantly. Was there a change that impacts CPU-based rendering? Were these scenes somehow flawed? Could something else be impacting render times? 

Attached is a postworked version of the boat render. I reduced the noise as best I could, but it's fairly visible in the shadow areas. Also attached is a screenshot of part of the GIS render (which I'm going to let render more later); that has no postwork.

Penguinisto

You're not the only one. I even brought older scenes that I had which I knew rendered in less than 3 minutes (3DL) out of storage, and those had render times which skyrocketed well beyond 15-20 minutes. 

I checked render settings just to be sure nothing got mucked-up there, no dice. I also exported one to .rib and ran it against the native 3Delight engine, and noticed log, long render times there as well. 

Perhaps DS isn't quite fully digesting the scene before handing it off to the engine?

 

Fletcher

Render speed actually descreased, but I'm using a video card.  It may also be due to updated nvidia drivers.  I'm don't think they would be doing much tinkering with 3DL anymore nor would they be trying to improve CPU rendering.

morlak17bg

Does anyone know how to speed up the render times.I literally chan not get my renders to work faster than hour per fram.  This must be a settings issue or something.

Inkubo

I just bought Carrara, and I'm blown away by the fast render times you can get, even though it doesn't use GPU. I wonder why DAZ doesn't integrate Carrara's rendering engine into DS?