If you experience extreme typing latency and Visual Studio is using high amount of CPU, even when idling, check if you have “Browser Link” enabled. I started experiencing latency when typing, after working just 5 minutes in Razor Views. CPU usage was consistent at 37-40%. Browser Link is a new feature in Visual Studio 2013 and enables dynamic data exchange between Visual Studio and your web application.

If you are interested in knowing exactly how Browser Links works, you can read more here.

Or if you just want to disable it straight away, do as shown in the picture.

The 15th of August Microsoft released Visual Studio 2012 and .NET Framework 4.5 to Web.
Several usefull tools and blog posts followed the hours after.
Download: Visual Studio 2012

Mads Kristensen from Microsoft also released a new version of Web Essentials for Visual Studio 2012. The essenstials extension let you perform common task faster and easier. Pretty essential indeed ;)
Download: Web Essentials 2012

While your at it, remember to grab the newest versions of JetBrains ReSharper for Visual Studio, which makes your life a lot easier as a programmer. Once you tried it, you wonder how you could ever live without. Resharping, code elimination, autocomplete, etc, etc…
Download: ReSharper

Schott Hanselman wrote a blogpost and posted several videos on getting up to speed with .NET 4.5 and Visual Studio 2012: Visual Studio 2012 and .NET Framework 4.5 is RELEASED – Here’s 5 minute videos to get you up to speed quick

Jason Zander, Vice President for the Visual Studio team wrote a “Top 12 of Visual Studio 2012”