Thanks for your feedback. As we added more and more functionality to GitLab it probably has gotten slower. Since a few months we have 2 people working on improving performance fulltime. As you can see in https://gitlab.com/gitlab-com/operations/issues/42 our focus is GitLab.com performance but many of the changes should also improve the speed for on-premises installations. Changes include fewer calls to git, better caching of markdown rendering, etc. We already saw a lot of improvement in GitLab 8.5 https://about.gitlab.com/2016/02/22/gitlab-8-5-released/ and we plan to continue making progress here.