 <p>There's a <a href="https://connect.microsoft.com/VisualStudio/feedback/details/551183/loading-toolbox-content-from-package-takes-55-seconds-or-more" rel="nofollow" title="Connect Bug Report">Connect bug report</a> for this. It's already closed, so you can't vote, but let Microsoft know you had the problem by clicking "I can too".</p>