Redshift render and viewport performance issues (i9 + RTX 4090)
Hey Dave,
I’ve just moved from Blender to C4D and I’m having a really hard time getting decent performance out of Redshift.
My setup’s pretty solid (i9-14900K, RTX 4090, 64 GB RAM, latest Studio drivers) but renders are still much slower than I’d expect, especially compared to Cycles on the same machine.
I followed your Redshift optimization tutorial (sampling, bucket settings, GPU prefs, etc.) but nothing seems to help, a simple render (1920x1080 or even lower) seems to take forever.
Also, when I follow your C4D sim tutorials, my viewport lags like crazy when the simulation device is set to GPU, and it only becomes smooth again if I switch to CPU in the Simulation Scene settings. Is that normal?
Really feels like something’s off in my config. Any idea what I might be missing?
Thanks a lot 🙏
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Hey Gale,
That definitely sounds frustrating — with that setup, Redshift should be running really smoothly. A couple of quick things you could double-check:
Make sure your RTX 4090 is selected in
Preferences>Renderer>Redshift>System(sometimes C4D defaults to the integrated GPU).Check that you’re using the latest
NVIDIA Studio driver, not the Game Ready one.For simulations, it’s normal for GPU mode to lag sometimes — especially if your GPU memory is near full. Switching to CPU for smoother playback while working is totally fine.
That said, since you’ve already optimized most of the Redshift settings and still see big slowdowns, it’s likely something specific to your system or driver setup — so you’d be best off reaching out directly to
Maxon Support. They can look at your system config in more detail and spot what’s going wrong.Hope that helps get you pointed in the right direction!