Hover effect was slow to load

Was initially going to report a critical bug as:

 Hovering over the "Repositories" dropdown does nothing; I have to click on the tab to trigger the dropdown, but clicking redirects me to /repo/mine.

I soon realized the problem was that slow-loading Javascript wasn't triggering the hover until it had finished parsing. I understand the importance of drawing the page first but wondering if that isn't the right choice in this particular case.