Microsoft has released build 1511 (aka Threshold project) as first major update to Windows 10 and some key tuning is found in the following 3 areas below:

http://blogs.windows.com/windowsexperience/2015/11/12/first-major-update-for-windows-10-available-today/

http://www.computerworld.com/article/3005602/microsoft-windows/what-you-need-to-know-about-windows-10s-new-upgrade.html

With this update, there are improvements in all aspects of the platform and experience, including thousands of partners updating their device drivers and applications for great Windows 10 compatibility. Windows 10 also starts rolling out to Xbox One today and select mobile phones soon. But most importantly, with this free update we have reached the point in the platform’s maturity where we can confidently recommend Windows 10 deployment to whole organizations.  Experience improvements in this update include:

1. Performance in everyday tasks, such as boot time now nearly 30% faster than Windows 7 on the same device.

2. With Cortana, you can use your device’s pen** to just scribble a note in the Cortana Notebook and Cortana will recognize the phone number, email address, and even physical address to help you set reminders. Cortana can also now keep track of your event and movie bookings too, sending you helpful reminders to know where to go and get there on time, plus the option to book and track an Uber**. We’re excited to make Cortana available in Japan, Australia, and Canada and India (in English) with features and experiences customized for each market.

3. Microsoft Edge offers improved performance and security, along with tab preview, which allows you to hover over your open tabs and get a preview of what’s on those websites without leaving the page you’re on. Microsoft Edge now syncs your Favorites and Reading list items across devices so you can easily get back to the content you’re interested in most. And, Cortana will now notify you of the best coupons** from your favorite retailers such as Staples, Macys and Best Buy when shopping in Microsoft Edge.