Screen lag when rendering with One GPU

Support Technical Support
1

I hope someone with experience can help me on this.

My PC has 1 GPU and the issue is when using it to render, the screen will lag.
It seems like a single GPU does not multi-task as well a CPU.

  • Is there any software settings I can do for a single CPU system?
  • Will adding a second graphics card help? So that 1 is purely for display and 1 is for rendering, will that work?
  • Alternatively, can actually all GPUs (if more than 1) be used without lag?
2

Hi. The problem that makes the whole system slow when you render with the GPU that handles the display/monitor is known and the only solution is to have a second gpu (even an integrated Intel GPU) to handle the display, while you render with the most powerful GPU.
But currently we have Eevee, and in heavy scenes we could also have the same problem as with CUDA. So depending on your needs, you should find the best configuration that will satisfy you. Even the ability to launch Blender with OpenGL render offload (for Eevee) on a different GPU sometimes.

1 Like