Why is my rendering so slow?

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david.given

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  • Joined: Tue Mar 15, 2022 9:06 pm
  • Real Name: David Given

Why is my rendering so slow?

PostFri Mar 24, 2023 9:14 pm

Good news! I have a shiny new Ryzen 7950x to replace my aging i7-3770k!

Bad news. It hasn't really improved rendering times.

While rendering video, CPU usage seems to hover around 30% (with the fans barely ticking over). RAM usage is low, I/O is at maybe 80MB/s on a drive which can do way more than that, I'm reading from one drive and writing to another... I think I'm doing everything right?

What could be causing the performance issues?

(Lite user, Linux.)
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Ellory Yu

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Re: Why is my rendering so slow?

PostFri Mar 24, 2023 9:40 pm

If you are on DaVinci Resolve, fastest GPU and lots of VRAM is necessary. CPU is inconsequential. I can’t speak for other NLE.
URSA Mini Pro 4.6K G2, BM Pocket Cinema Camera 6K. iMac Pro 27” 5K Retina, 64gb, 1Tb SSD, 12Tb M.2 NVMe TB4 DAS, 36Tb HDD DAS, Vega 56 8gb GPU/ BM Vega 56 8gb eGPU, MacOS Sequoia, Resolve 19.1.1 Studio. BM Panel & Speed Editor. Dual Display setup.
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david.given

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Re: Why is my rendering so slow?

PostFri Mar 24, 2023 11:05 pm

Sorry, yeah, Davinci Resolve.

My GPU's not so great --- an Nvidia 1060, so that could be it. But doesn't the renderer use both GPU and CPU together? I'd still expect to see 100% CPU while doing work no matter how fast my GPU.

(I did try turning GPU acceleration off in the preferences, but it didn't make a difference.)
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Ellory Yu

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Re: Why is my rendering so slow?

PostSat Mar 25, 2023 4:34 am

david.given wrote:Sorry, yeah, Davinci Resolve.

My GPU's not so great --- an Nvidia 1060, so that could be it. But doesn't the renderer use both GPU and CPU together? I'd still expect to see 100% CPU while doing work no matter how fast my GPU.

(I did try turning GPU acceleration off in the preferences, but it didn't make a difference.)

No, not at all. Unlike premiere or Vegas, Resolve is primarily GPU and VRAM dependent. The NVIDIA 1060, depending on what you are rendering, won’t cut it. You can try rendering a DNXHD and 1080 timeline and that might work.
URSA Mini Pro 4.6K G2, BM Pocket Cinema Camera 6K. iMac Pro 27” 5K Retina, 64gb, 1Tb SSD, 12Tb M.2 NVMe TB4 DAS, 36Tb HDD DAS, Vega 56 8gb GPU/ BM Vega 56 8gb eGPU, MacOS Sequoia, Resolve 19.1.1 Studio. BM Panel & Speed Editor. Dual Display setup.

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