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I have a MacBook Pro where VMWare Fusion is installed to enable Windows 7 and Ubuntu. One year ago, my system was well configured so that I could run Mac OS, Windows and Ubuntu at the same time. Later, I made some changes, probably around the attribution of cores and memories, now running the 3 systems simultaneously is very slow, although only running Mac OS + Windows or Mac OS+Ubuntu is fast enough. But I do need the 3 systems open for my work.

The resource for the 3 systems are listed as follows. Does anyone know how to arrange the ressource to re-enable the running of 3 systems simultaneously? Or does anyone have a good idea to make it possible?

Here is the resource of my Mac: enter image description here

Here is the resource attributed to Ubuntu: enter image description here

Here is the resource attributed to Windows: enter image description here

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I use Parallels for virtualization but I also run three OS simultaneously (OSX, Windows 7 and Windows 8).

My settings are: 2 cores and 2 GB of RAM for each VM and more important VT-x support enabled, in your screenshot the first checkbox under Advanced Options.

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