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I'm working on vmware image files. My computer always load hard disk and vmware works very slow at the same time.

Guest OS: Windows XP SP2
Host OS: Windows XP SP2

Is there any way can improve the performance?

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migrated from May 31 '10 at 4:09

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Do you have enough system resources allocated to your VMs? Does your CPU have support for Virtual Machines (and is that support enabled in bios?) – Alan May 31 '10 at 4:07
How much memory does your guest operating system have? As a percentage of your total memory. – Rohan West May 31 '10 at 4:08
... and how much memory does the HOST OS (XP) have? – Chris_K May 31 '10 at 4:34

From your question it sounds like the guest OS hard drive is an image file on the host OS. VmWare has the ability to write directly to a partition instead of an image file. That should speed up the hard drive access for the Guest OS.

Also as other comments suggested, increase the RAM on your computer, getting a faster hard drive (higher RPMs) should also help out.

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