id,summary,reporter,owner,description,type,status,component,version,resolution,keywords,cc,guest,host 5294,VirtualBox performance is much worse when Intel VT-x is enabled,Michał Gołębiowski,,"I have Dell Latitude E6500 with P8600 CPU. When I run my Windows XP guest on !VirtualBox OSE without virtualization VT-x option inactive it runs much faster than in the case I turn it on. It is really visible - with VT-x on I even see how screen flickers during the boot process. I did Peacekeeper tests in Firefox and I got these results: 1. VT-x off, 3D support off - 1596 2. VT-x off, 3D support on - 1679 3. VT-x on, 3D support off - 900 4. VT-x on, 3D support on - 1314 Google Chrome behaves even more strange - with VT-x off it runs faster than Firefox, while with VT-x on it runs *VERY* slow but looses no frames in graphic tests and it finally gets about 8800 points. I checked both on OSE version and a closed one. My OS is 64-bit Ubuntu Karmic. For more information, see here: https://bugs.launchpad.net/bugs/455112",defect,closed,other,VirtualBox 3.0.8,wontfix,"intel, vt, vt-x, virtualization, 64, 32",,Windows,Linux