Here's something that may help people on win 7 - Dyncache, a service to manage cache sizes. Something that m$ put out to implement similar cache management for it that they put in win 8+. https://www.microsoft.com/en-us/download/details.aspx?id=9258
Thanks for that hint jaggard! I have no Win7 for testing, could someone confirm, that this works? @equipoise, maybe this can fix your issues?