Since you're using 10 in a VM, you might not have noticed this, but in case you have...
I'm running Windows 10 as my daily driver (or at least that's what the cool kids call it). Other than the UI seeming a little patchwork in places, it's been perfectly solid and stable for me. I'm just about ready to declare it about the best version of Windows ever.
But there is one problem. There's a memory leak somewhere, and I'm pretty sure it's due to Project Spartan. I used it for about a week as my main internet browser, and while doing so, I'd notice that task manager would eventually show that 80-99% of my memory was in use, but it wouldn't say what was using it. Combing through the processes came up with a blank. It'd make some of my more ram intensive apps act flaky, and I'd eventually have to reboot to get that memory back. I figured it might be Spartan, and sure enough, when I quit using it, the problem went away.
...at least until today, when I saw I was using 80% of my memory for nothing at all.
So have you seen or heard about any memory leaks in Win10? I've googled it, but haven't been able to find much about it except something about a small GDI issue.