Files belonging to multiple projects might be handled incorrectly
ReSharper 9 known issues http://resharper-support.jetbrains.com/forums/23063283-Hot-ReSharper-9-issues
If ReSharper C++ considerably hinders performance of Visual Studio, please provide a performance snapshot (following the instructions under step 7) to the development team to investigate.
For a better experience with ReSharper C++ we recommend disabling Visual Studio native C++ support. In order to do this please go to Tools | Options | Text Editor | C/C++ | Advanced | Browsing/Navigation and set Disable Database to True. Please note, that in this case Visual Studio Class Wizard won't be available.