Every year, Parallels releases a new version of its eponymous PC emulator for Macs, and with OS X Yosemite just around the corner, so is Parallels Desktop 10 ($80). Boasting Yosemite support and “cool new features of Yosemite in your Windows apps,” including Mac-style social media sharing within Windows, version 10 also promises the typical speed and performance increases—this time, 48% faster opening of Windows documents, 50% improvements…