Microsoft has released the latest Windows 10 PC Insider preview build for Fast Ring members. The build number is 11099 and mostly has optimizations for its OneCore features.

In a blog post, Microsoft's Windows Insider head Gabriel Aul stated:

" Our focus through the holidays was on structural improvements to OneCore, which is the shared core of Windows across devices. The code refactoring and other engineering work we've been doing to optimize OneCore is nearing the point where we will be ready for teams to begin checking in new features and improvements. It will still be a few builds before any really noticeable changes show up, depending on when teams begin lighting up new features in their areas. We're excited for Insiders to use this build to validate the work we've been doing to OneCore, so give this build a try and let us know of any issues you run into via the Windows Feedback app."

One known bug in previous builds has also been fixed with this new release; Aul stated that "the progress dialog when copying or deleting files via File Explorer now shows up as expected."

Aul also repeated what he said in December that Microsoft plans to release builds to Windows Insiders in the Fast Ring on a more frequent basis from now on, but as a consequence, those builds "may include more bugs and other issues that could be slightly more painful for some people to live with."

Source: Microsoft