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Obtain VirtualBox from your linux distribution's repository.Obtain VirtualBox from the Official Oracle repository (newer version).* [https://download.virtualbox.org/virtualbox/ Versions files and extension packs]For an example since the test machine has VirtualBox version 7.0.14r161095 the file Oracle_VM_VirtualBox_Extension_Pack-7.0.14-161095.vbox-extpack was downloaded as it is an exact match. vboxmanage is used to install the extension pack... sudo vboxmanage extpack install Oracle_VM_VirtualBox_Extension_Pack-7.0.14-161095.vbox-extpack=== Windows 7 64-bit Extremely Slow ===Windows 7 Home Premium SP1 (64 Bit) runs very slow in virtual box.It was noted in the log several lines indicating AsyncCompletion delays. This is disk related. 01:12:42.042957 AsyncCompletion: Task 0x007f0767284200 completed after 30 secondsenable the Host I/O Cache in Storage > Controller: SATA. ... RESOLVED PROBLEM.