Ubuntu running very slowly on VirtualBox VM

Question

As stated, my VM is running very slowly.

Guest: Ubuntu 14.04 'Trusty Tahr'

host specs:

It is unbearable, I can't write in the console as it takes half a minute for text to update on the command line, or not at all

Things I have tried:

More info:

VirtualBox version 5.2.20
I have the same problem on another VM:18.0.4LTS.
Updating the guest is not an option, as it is a pre configured OS for a project. (This is not the problem probably as the same problem appears on LTS)
It is possible that LTS started slowing down after installing guest additions.
CPU and RAM on host (task manager) are about 50-70% tops when running vm with other programs running in addition on the host.

Any help is appreciated, thanks.

thanks

How many CPUs are the VMs using? Are virtualization options (VT-x, Hyper-V and such) enabled in the BIOS? — xenoid, Commented Oct 31, 2018 at 0:06
Well, my Ubuntu VMs have fewer resources than yours, and mine are fast and instantly responsive. I'd check that Windows isn't throttling your VM resources. — user535733, Commented Oct 31, 2018 at 3:17
Check disk loading. Both host and guest doesn't have sufficient RAM for disk buffer. If your using traditional HDD it could be a huge pain. — Alvin Liang, Commented Oct 31, 2018 at 5:58
@xenoid I checked using the method shown here using the task manager, and virtualization is enabled. I fiddled with the VM options again and disabling "Enable VT-x/AMD-V" solved it. Guest runs pretty smoothly now. Does it do any harm if that option is disabled? — Eloo, Commented Oct 31, 2018 at 10:45

Eloo · Accepted Answer · 2018-10-31 15:02:44Z

1

The solution that worked for me:

answered Oct 31, 2018 at 12:28

Eloo

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