Visual Studio 2015 XAML文件冻结

I've recently updated the version of VS from 2013 to 2015. I work on WPF and obviously, I have to modify *.xaml files; every time I leave a .xaml file Visual Studio freezes for about 15-20 seconds. I cannot work like that! I've uninstalled Reshaper, but no change. I've closed even the designer process, but still - no success.I've recently updated the version of VS from 20