This feature is so useful to me that I've created an account just to post about this...
In old versions of VirtualBox, there was a feature called WarpDrive. Basically, you could use the command "VBoxManage setextradata (VM name) "VBoxInternal/TM/WarpDrivePercentage" (number)" to make the clock of the guest OS run at that speed. So if the number you entered was 200, the guest's clock would run at x2 speed, every second is two seconds in the guest VM. This feature is very useful if you want everything in the VM to go slower or faster, and it can be used in old games where the clock's speed would affect the game's speed directly.
I've found some information about this feature in official VirtualBox documentation, though I can't post it because I must be a member for 1 day and have 1 post before I can post urls. Though it's not a feature that has ever been talked about too much apparently.
VirtualBox is the only software that provided a feature like this as far as I know. No other VM software or even regular software for host PCs offered this.
This feature stopped working altogether from version 5.0 onwards. It still works in version 4.3, but getting these old versions to run in modern Windows 10 is a bit problematic. As far as I know, the feature wasn't intentionally removed, but as it was very old code it just stopped working.
I use this feature so much that I actually downgraded to Windows 10 Anniversary Update (August 2016) to be able to run VirtualBox 4.3.40. But sadly, as time goes by, software starts to be incompatible with this old Windows version and I already have problems with some drivers. And this feature is the only thing holding me back.
VirtualBox 4.3 could run in Windows 10 until Build 16237 (July 2017). From that build onwards, all VMs fail to start (this was talked about back in the day (again, I can't post links.) It affected VirtualBox 5.0 and 5.1 as well, but these versions were still supported so their users just updated to the new builds). Some of the oldest 4.3 builds (not the newest) can still run on the last version of Windows 10, but give many errors and don't support Windows 10 as a guest OS.
Therefore, I'd love to see WarpDrive again on modern versions of VirtualBox, so I wouldn't have to be stuck with both an old OS and an old version of VirtualBox.
Thanks for reading
