slow performance on new (2017) retina iMac

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Re: slow performance on new (2017) retina iMac

Postby davey jenk » 23. Jun 2017, 00:17

mpack, thanks again, sincerely. part of the problem i am sure here is that i know just enough to get myself in trouble and not enough to solve anything. i am a designer, not a programmer, and i see a pretty gui graph that slides 0-8 and i pick the one in the middle in the green area.

i spent the morning getting into adjusting more and more of the settings in virtual box. when i clicked both enable 2D and 3D acceleration on the display tab, and increased video memory to 256, one of those items did the trick. it's now responding 4-5x as fast as before and very usable.

fwiw, i have adjusted the processor slider back to 4 and allocated 9GB ram to the VM and both windows and mac sides are working great.

thanks to all of you for your help efforts and a great product.
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Re: slow performance on new (2017) retina iMac

Postby mpack » 23. Jun 2017, 08:53

davey jenk wrote:fwiw, i have adjusted the processor slider back to 4 and allocated 9GB ram to the VM and both windows and mac sides are working great.

Do NOT give the VM 4 cores. That setting was wrong. The fact that it wasn't the only thing wrong didn't make it less wrong.

The RAM issue is more marginal. You are not quite overcommitting host RAM, but you're getting close. In a different day you might exhaust all your RAM and the VM may crash and/or cause widespread performance problems. Unless you know that your VM will suffer without it, I would reduce this to a safe level as I already said. I would go with 8GB.
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Re: slow performance on new (2017) retina iMac

Postby socratis » 23. Jun 2017, 10:05

davey jenk wrote:why does my slider in virtual box go up to 8 if there are only 4?

If it helps, it used to be green until your 4 CPUs, orange up to 8 and red until 12. That was a certain way to kill your host. They "fixed" that... ;)

And yes, as mpack said, 9 GB might be good now, but not tomorrow. In reality I've never, ever, needed more than 4 GB, and that VM was doing source code compilation. I don't know your specific needs, but the first thing that I do on every system, host or guest, it to get a system resource monitor, activity monitor or task manager (whatever you want to call it). That's the first thing that's running on every OS I've used/am using. If I allocated 9 GB to my guest and it only needed 2 GB, I know that I just wasted 7 good GB...
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Re: slow performance on new (2017) retina iMac

Postby Olliedog00 » 1. Nov 2018, 17:12

Hi
Did you ever resolve your slow performance on the 2017 Retina Mac. I have exactly the same problem and although the guys have been extremely helpful in the forum, I still have not been up to resolve the problem. Just wondering if you found a cure?
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Re: slow performance on new (2017) retina iMac

Postby socratis » 1. Nov 2018, 17:22

@Olliedog00
You have your own dedicated thread. Please stick to it. Do not wake up other, older threads. The next message to another thread that's not dedicated to you, will be removed...
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Re: slow performance on new (2017) retina iMac

Postby paxo » 28. May 2019, 08:15

I ended up here in May 2018 after upgrading Mac to Mojave what forced me to upgrade Virtual Box to 6.0.
Performance of NetApps image (Oracle on Linux) degraded just by upgrading Virtual Box.
I played with settings and it seems everything is back to "normal".

I changed:
System - Processor - Processors: from 1 to 2 cores
Display - Screen - Video Memory: from 16 to 64 MB
Display - Screen - Scale Factor: to 125%
Display - Screen - Graphics Controller: to VBoxSVGA
Audio: disabled

Although, I do not know and didn't check one-by-one which setting(s) made the change, it is obviously doable ;)
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