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