I’ve now installed every version of Parallels since version 1, yet it seems each new version has less to offer. With version 1, it was an almost infinite improvement over no virtualization. Version 2 was easily twice as good with improved speed and stability. The previous upgrade was only a 10% improvement, and now, going from 11 to 12, it feels like I’m getting less than approximately 9.1% improvement out of the upgrade.