In general, what are some things a Windows 8.1 user should be aware of if upgrading? I know about telemetry and the Cortana keylogging thing, and about the mandatory updates. Apparently you can disable all of these "features", which is great. I read WASAPI got upgraded for better performance in low latency applications which is very neat (it's why I've finally decided to get on 10, despite lacklustre drivers for some of my hardware). Have there been any changes in system behaviour relevant to things like CPU performance, audio performance, things of that nature which I should be aware of and have to tweak/live with? Examples of similar things in Windows 8.1: disabledynamictick was useful for a brief period in order to prevent minor system hangs. For a long while it was necessary to manually enable 1000hz polling on mice.