Tag search delay in editor

Hey

I’m newbie in WP. But I understand that this is strange how WP search tags in editor page.
I write several letters. I see that my request is accomplished and editor got data. But I can’t see it. UL list is hidden. I should place another letter or even erase exist letter and write it again and after I can see the answer.

The page I need help with: [log in to see the link]