VirtualBox 5.1.0 版本发布，这是一个重要的更新，主要是在性能的提高和多媒体的支持上。

更新日志：

• VMM: new APIC and I/O APIC implementations that result in significantly improved performance in certain situations (for example with networking, bug #15295)

• VMM: added support for Hyper-V paravirtualized debugging of Windows guests

• VMM: emulate even more MMIO and shadow pagetable exits without going back to user mode

• GUI: overall migration to Qt5 (bug #11775)

• GUI: passive API event listener improving the VM GUI performance and response time

• Audio: added HDA (High Definition Audio) support for newer Linux guests

• Audio: added on-demand timers which should improve the overall performance and reduce the CPU consumption

• Audio: more fine-grained volume control for the AC'97 emulation, which now also takes the master volume control into account

• better support for Python 3

添加/修复了以下项目：

• VMM: activate the x2APIC by default for Linux guests

• VMM: many more fixes

• GUI: the Detach UI action is now a part of the VM Machine menu

• GUI: reworked session information window

• GUI: the new VM wizard now allows to choose the VM location for the VM which is being created

• GUI: fixed location of touch events in unscaled HiDPI mode (bugs #14366, #14367)

• GUI: various bugfixes and internal cleanup

• Storage: use fallocate() or similar if present to speed up creating fixed-sized disk images (bug #5967)

• Storage: implemented NVMHCI-compatible storage controller

• Audio: various bugfixes and infrastructure improvements

• E1000: implemented interrupt throttling for performance improvements

• EFI: many improvements, for example allow to boot from USB

• OVF: improved handling of signed manifests

• API: Windows XP guests and Windows 2003 server guests now default to the E1000 T Server network card

   

• VBoxSVC: fixed several memory leaks when handling .dmg images

• Installers: ship VBoxBugReport

   

• Windows hosts: reworked COM proxy (e.g. bug #8298)

• Linux installers: no longer rely on DKMS for module rebuilding

• Linux Additions: fix a problem when updating the initramfs after the guest modules are compiled (bug #15579)

• Linux Additions: try to fix a problem where the OpenGL libraries where loaded by the X server when we only support X clients (bug #15574)

详情：https://www.virtualbox.org/wiki/Changelog