I noticed that the live render preview has a significant impact on the rendering time in Blender 2.8.
How to disable render preview in 2.8?
This advice works on a build of 2.80 from a couple of days ago, so depending on how old your build is, you may need to update. With the mouse over the 3D viewport, press Z. You’ll get a pie menu allowing you to choose your display mode. Choose Wireframe for the best performance improvement.
Thanks but I meant the final render preview (F12). Rendered image shows automatically in image editor and slows down rendering in Cycles. Of course I can switch view in image editor after F12 manually but it is annoying. I just would like to see rendering progress bar without image preview by default.
Ah, I’m tracking now. So, there are a few things you can do to achieve faster rendering regarding the display of your render.
First, would be to disable the render window by clicking the Render menu in the upper left-hand part of the UI, hovering over Display Mode, and checking Keep User Interface. This will render your scene with a progress bar, but will not display the rendered image. Now, in a 2.80 build from 1 Feb, I think I might have stumbled across a UI issue. When the Keep User Interface option is selected, pressing F11 to bring up the render result window does not work. In order to view your render when complete, you have to go back, change Display Mode back to New Window, and then F11 will bring up your render result. Edit: It looks like this is the same way it worked in 2.79, but it isn’t transparent to the user that having this enabled overwrites the functionality of F11.
Second, you can go to the same location (the Render menu) and choose Lock Interface. This theoretically should free some RAM (not sure if system or video RAM) that will allow Blender to use those resources to render faster.
Finally, if you don’t want any of the Blender UI taking up resources, you can render from the command line. I’ve never done that myself, but this manual page has information on how to do that: https://docs.blender.org/manual/en/latest/advanced/command_line/arguments.html
That manual page is for 2.79, so I can’t say what works on 2.80, but if you run blender --help | more from the command line, you’ll get the arguments the executable you’re running should support.
Hope this helps!
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Render / Keep User Interface - this is exactly what I needed. Thanks so much.
Sometimes I use command line rendering but it is not always reasonable.
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for 2.81 and onwards setting moved to prefrences
Edit > Preferences
sourcec : https://developer.blender.org/T70795
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