I'm trying to implement a VM snapshot & resume feature in a VM manager app. For some reason, both saveMachineStateTo and restoreMachineStateFrom to save machine memory to a file and restore saved vzstate/memory back for a VM is taking a lot of time on my system (XCode 26.3, macOS 15.7.7). The test VM has only sizes in the range of 4-8GB RAM. Any tips or tricky to speed it up, for example, do like a CoW on the RAM so VM can be briefly paused and quickly resumed after while streaming the RAM in background? Or, any other ways for example for RAM compression, dirty-page tracking, or live/background RAM streaming to a file? Or, to instrument and dig deeper, what's taking time? Thank you.