Qt Creator is very slow with git repositories

I have a really big problem with the use of git + Qt-Creator + OS X. We recently moved from our SVN repository to git. The problem is, that Qt Creator is really slow with the new git repo. Especially when i am opening a source or header file. This makes the whole repo unusable, because I have to wait for about 10-15 seconds till the file is open in the editor. With SVN i don’t have these problems. For Info: I am using a Macbook Air 2011 with a 128GB SSD. We are using Qt 5.0.1 and the Qt Creator version 2.6.2 We are using Bitbucket as our hosting platform for the git repository Thanks for your suggestions