Cloning this repository:

git clone git://gitorious.org/~benner/qtwebkit/benners-performance.git benners-performance
cd benners-performance

Add this repository as a remote to an existing local repository:

git remote add benners-performance git://gitorious.org/~benner/qtwebkit/benners-performance.git
git fetch benners-performance
git checkout -b my-local-tracking-branch benners-performance/master_or_other_branch