This is sample code showing how it sucks that the speed of log command of libgit2.

Download git repository into /tmp.

        cd /tmp
        git clone git@github.com:git/git.git

Install libgit2 into /usr/local/lib. See libgit2.

Build and run the test.

        cd libgit2-log-sucks
        make
        ./show-last-commit.sh

And then enjoy your time!