100% CPU Utilization

[babba]

Folks,

I just noticed, that the participation in the English Forum is much higher - so I place my translation here again:

I decided recently to gain some experiance with Virtual Box.

The Host is a MacBook Air 13'' (end 2010) with 2,13 GHz Intel Core 2 Cuo CPU (2 Cores) and 4GB RAM - Host OSX is El Capitan
The Installation of Virtual Box Version 5.0.8 hwent flawless and iI tried to set up a Gueast System
with Windows 7 Ultimate 32bit with 512MB RAM, 1GB Disk and 1 Core.

Aktually everything works fine in the beginning and Windows 7 is starting without any problem - showing a CPU Utilization of a few percent.

Leaving the 'Pure Vanilla' Windows just open and watching the Task Manager you can observe that after about 3 minutes die CPU Utilization starts to increase stalling soon at 100% with Host CPU at around 50%.
Windows is still functionning - but getting slow.

Now my question:
a) Is any one else out there observing the same problem?
b) knows anyone a fix to get the CPU-Utilization in a 'normal' range?

Thanks for any feedback and have a nice weekend.

best regards
babba

[loukingjr]

Turning off automatic updates in Windows will help. You also can do a search for how to speed up Windows 7.
512MB RAM for Windows 7 is the bare minimum. Try increasing it to 1024MB. VRAM should be at least 64MB. Make sure VT-x is enabled in the guest settings and of course that the guest additions are installed.

The bottom line though is guests will be somewhat slow on an Intel Core 2 Duo.