The latest Windows 10 cumulative update is now available, but there's an issue impacting some PCs that install it, causing them to become "abnormally slow". If you're affected, help is at hand.
Build 10586.318 RSS
A new cumulative update for Windows 10 PCs and phones is now available for both non-Insiders and Insiders on the Release Preview ring. As with most cumulative updates, there are no new features.