Search is very slow and doesn't respond

Since yesterday when I try to search for a repo on gitlab.com I very often (9/10) get 502 error:

Whoops, GitLab is taking too much time to respond.
Try refreshing the page, or going back and attempting the action again.

Example search query: https://gitlab.com/search?utf8=%E2%9C%93&search=gitlab.com&group_id=&project_id=&repository_ref=