When building a level on my game I have experience stuttering when zooming out to see the full view. I thought nothing of it until I did the same at a school computer, and it ran better than my rig at home… The school computer was an Imac with a 1.9 ghz processor, gb ram, and an apu not gpu. So why is my 3.6 ghz 6-core, 8 gb ram, and AMD r9 280 gpu rig at home suffering? I’ve measured the usage, the processor doesn’t top 19%, and the gpu doesn’t break 30% utilization.
It’ll be your CPU topping out. You’ve got 6 cores? What’s 100/6? 16% Plus a bit for windows to render the, well, windows.
Blender’s UI is single-threaded for the most part.
As to why the school computer ran it better, it may well be because the imac has an APU meaning the CPU and GPU are physically as close as they can get: is virtually no time to transfer data between them.
Interesting fact: my i5 ultrabook with integrated graphics can show more polies in the viewport than an i7 3770 could without a GPU. Not too sure why.
Also, the linux based OS’s (including mac) tend to be a little more efficient than Windows for blender.
I find the mac version to be generally more clunky. An example being the animations won’t run properly in full-screen mode.
I don’t see how the PCI 3 can cause such a delay.
Lastly I meant to say that not a single core went above 16%, so not even the one blender used was topping out. Though with a bit more pushing I find one core does get to 50%.
Edit: With a bit more searching I found that some users experience view-port lag attributed it to the devs leaving in older code? I don’t understand how that would give the APUs an advantage, but that’s something.