Without the extension pack, guest operating systems are strictly limited to legacy USB 1.1 speeds. Installing the package enables high-speed USB 2.0 and superspeed USB 3.0 data transfers. This allows you to connect external hard drives, webcams, flash drives, and specialized hardware peripherals directly to the virtual machine at native hardware speeds.
: On Windows, this often requires running VirtualBox "as Administrator" before attempting to install or uninstall the Extension Pack. A full reboot of your host PC before and after installation can also resolve lingering process conflicts. virtualbox 61 extension pack better
Which (USB, encryption, RDP) are you trying to optimize? Without the extension pack, guest operating systems are