I'm finding the internet on my Windows 10 virtual machine through Parallels to be slow. I Googled it and found the a thread < https://forum.parallels.com/threads...ter-on-mac-os-so-slow-using-parallels.344397/ > and KB discussing the solution < https://kb.parallels.com/en/124514 >. To rectify it requires shutting down the Windows 10 Virtual Machine, going into the Windows 10 Virtual Machine Configuration, Options Tab and then Optimization. The problem I have is that I do not have the 'Optimization' section. I've checked on both my machines - one running Parallels Desktop for Mac 14 and on running the new version 15 - same deal, no 'Optimization' section, just 'Startup and Shutdown' followed by 'Sharing' when the thread and KB linked above show there should be 'Optimization' section in between.