Extremely slim Windows 7 for virtual machine: lower CPU usage

dotancohen

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I am running a licensed and legal Windows 7 installation in Virtualbox to run Dragon Naturally Speaking. I have plenty of RAM, but CPU contention is a problem. On the host OS there is a particularly CPU-intensive application, and in the Windows 7 guest Dragon NS is CPU-intensive as well. I would therefore like to disable all unnecessary Windows services to lower CPU requirements. This machine is not connected to the internet and is used for nothing other than running Dragon NS. I do not browse the web, office, etc. and therefore I have no qualms about disabling Windows update and other services.

Which services can be terminated in this case? Thank you.
 

My Computer

OS
Ubuntu Linux

My Computer

Computer type
PC/Desktop
Computer Manufacturer/Model Number
Custom built at Home
OS
Windows 7 64-bit, Windows 8.1 64-bit, OSX El Capitan, Windows 10 (VMware)
CPU
Intel i5-3350P 3.1 GHz
Motherboard
Gigabyte GA-Z77X-UP5 TH
Memory
16 GBs GSkill Sniper
Graphics Card(s)
Radeon HD 7850
Sound Card
VIA HD Audio
Monitor(s) Displays
Dell U2410 24"
Screen Resolution
1920x1200
Hard Drives
1 x Intel 520 240 GBs
1 x Seagate 1TBs SATA 2.0,
1 x Seagate 1TBs eSATA 2.0
PSU
Thermaltake 850W
Case
Antec P183
Cooling
Noctua NH-D14 Heatsink 2 x 120mm fans, 4 x 120mm case fans
Keyboard
Dell Multimedia keyboard
Mouse
Logitech Trackball
Internet Speed
28.5 Mb/s
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