A new pre-release is available on github: In this release, we update the KVM backend to leverage KVM's implementation of enhanced Hyper-V enlightenments (e.g., SynIC, STimer). These improvements further boost the performance of Windows guests. https://github.com/cyberus-technology/virtualbox-kvm/releases/tag/dev-20240226
https://wiki.gentoo.org/wiki/Zero-day_bump_requests
I just pushed it. But in the future please wait a few days before filing a bump request, I don't work full time on this. Thank you!