I would like to propose a few of long-time existing glitches and performance limitations (that affects hundreds of my coworkers and are quite frequently mentioned on this forum as well).
- Manual tweaking of power throttling (in Windows) and P cores affinity (VMX) to avoid freezes, that reduces performance of the VM since 1/3 of the cores cannot be effectively activated (E cores on Intell 12/13th generation processors).
- Mysterious random GUI/Xorg freezes that forces to suspend and / or restart VMs with certain 5.15/5.19 Linux kernels for supported Ubuntu 22.04 LTS releases (at least this seems to be gone in 6.2 kernel).
- Limited performance of NVME disks, that after tuning can reach only <75% (Ubuntu 22.04 6.2 HWE) of raw host performance (5.x kernels are worse). Additionally, NVME controller is affected by strange I/O timeouts on certain workloads / configurations (23H1 beta seems to be reducing number of timeouts but not eliminating). Finally, in my case SCSI is not a fallback since performance is significantly worse, reaching ~30% of raw host performance (especially terrible latency).
- Limited performance of SVGA3D driver, especially now when GPU Partitioning becoming a thing in Hyper-V for standard GPUs.
