Regression: Blender Viewport Lagging in 4.0.0 (MacOS) #114875
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Reference: blender/blender#114875
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System Information
Operating system: MacOS 14.1
Graphics card: AMD Radeon Pro 5300 4 GB
Blender Version
Broken: 4.0.0
Worked: 3.6.5
Short description of error
Opening Blender and changing the view to "Rendered" makes Blender lag heavily, stuttering as the viewport is manipulated.
NOTES:
Exact steps for others to reproduce the error
The playback is not smooth.
Blender Viewport Lagging in 4.0.0 (MacOs)to Blender Viewport Lagging in 4.0.0 (MacOS)Issue persists even when Factory Settings are reset.
No lag here on my MacBookAir M2.
Does this happen in particular file (like your previous report: #112976)?
@antoine.grasset:
"What's your computer and/or CPU?"
2020 Intel iMac
CPU: 3.3 GHz 6-Core Intel Core i5
"Can you reproduce the issue in Blender 3.6.5 by choosing "Metal" in Preferences > System > GPU Backend"
No, I could not.
@PratikPB2123:
This issue happens in any scene, even a scene without any objects/lights, empties, etc. in it.
Found the issue. Problem was due to window scaling.
Scaling the Blender window up to fill my whole screen caused it to lag. Decreasing the size fixed it.
However, the problem still persists.
What might be causing this?
Video of issue:
Well I think that reducing the window diminishes the number of pixels to be rendered, thus the faster rendering.
Consider that the Blender viewport fullscreen might be 4K on your monitor : then by reducing it to a quarter you'll only be rendering 1080p.
What's your monitor resolution ?
It's a 5K retina monitor scaled to 2880x1620 within my computer's settings.
Thanks. Slower render time is expected for high resolution monitors (Involves more number of pixels. Almost 5times more rendering of pixel for 5k monitor compared to a standard HD monitor). #109989 is related
But you've mentioned 3.6 do not have this issue. Can you check 3.6 performance in full screen mode?
Just tested 3.6.1. Can confirm: 3.6.1 and 3.6.5 both perform like normal in full-screen mode with Metal and OpenGL backends.
However, using the Metal backend caused Blender to run approx. 30% slower when manipulating the workspace, as compared to OpenGL.
Thanks. Since this involves "Cycles", can you compare CPU rendering results of 3.6 - 4.0? (so we can forward this report to correct Michael)
@iss hi, can you reproduce this?
Blender BMW Demo Scene Benchmarks:
3.6.1: (Cycles CPU)
49 seconds
4.0.1: (Cycles CPU)
49 seconds
3.6.1: (Cycles CPU)
3 minutes, 36 seconds
4.0.1: (Cycles CPU)
3 minutes, 24 seconds
Can not reproduce regression, tested with junk shop file and 4.0 is quite a bit faster than 3.6
I found the solution and it fix ALL problems !
#115405
I have post in comment on the down, now blender work AS WELL !!!
@DimplesApplepie: I am not using a dual-monitor setup, and even with that setting on this issue persists.
I'm also on an Intel iMac, if that helps.
@iss:
While the lag isn't fixed entirely, viewport performance is nearly back to normal (stuttering disappears) by just turning off "Viewport Denoising." Potential bug; can you replicate?
The only thing I was able to confirm is stuttering of playback while in rendered mode. The rendering itself is at least as good as 3.6 though. It is possible I was looking at lag in updating viewport previously. Not sure what should I use as benchmark in this case. Shall I confirm this issue based on laggy playback?
I can confirm. Issue only persists in render preview mode. As I documented above, rendering benchmarks are nearly identical. GPU rendering is noticeably faster.
Confirm it for laggy viewport manipulation whilst in render preview mode and playback.
Blender Viewport Lagging in 4.0.0 (MacOS)to Regression: Blender Viewport Lagging in 4.0.0 (MacOS)My error, I meant "Noise Threshold" in Viewport Rendering settings, not "Viewport Denoise."
Any updates regarding this? I've updated my OS to 14.4, and while it has fixed some issues (EEVEE bokeh works now), this issue remains.