I think that about a year ago I had a similar problem on a borrowed notebook. I don't remember if it has Intel or AMD CPU, but it had virtualization support and turning on using it in VirtualBox caused everything to run a few times slower.
So it seems it's a long-time issue... Did sb report it to Sun? ** Description changed: Binary package hint: virtualbox-ose 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 sth like 8800 points. + 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. ProblemType: Bug Architecture: amd64 CheckboxSubmission: b35340b6290029563207fd4b2aa461a1 CheckboxSystem: d00f84de8a555815fa1c4660280da308 Date: Mon Oct 19 04:44:51 2009 DistroRelease: Ubuntu 9.10 InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Alpha amd64 (20091008) Package: virtualbox-ose-qt 3.0.8-dfsg-1ubuntu1 ProcVersionSignature: Ubuntu 2.6.31-14.48-generic SourcePackage: virtualbox-ose Uname: Linux 2.6.31-14-generic x86_64 VirtualBoxOse.DpkgList: ii virtualbox-guest-additions 3.0.6-1 guest additions iso image for VirtualBox ii virtualbox-ose 3.0.8-dfsg-1ubuntu1 x86 virtualization solution - base binaries - ii virtualbox-ose-qt 3.0.8-dfsg-1ubuntu1 x86 virtualization solution - Qt based user + ii virtualbox-ose-qt 3.0.8-dfsg-1ubuntu1 x86 virtualization solution - Qt based user ii virtualbox-ose-source 3.0.8-dfsg-1ubuntu1 x86 virtualization solution - kernel module -- VirtualBox performance is much worse when Intel VT-x is enabled https://bugs.launchpad.net/bugs/455112 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-b...@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs -- universe-bugs mailing list firstname.lastname@example.org https://lists.ubuntu.com/mailman/listinfo/universe-bugs