The Tag Editor takes up to a few seconds to display the list of "Most Popular Tags in the Database". This is due to the fact that the list is compiled by examining all tags in the database. As the number of tags goes up over time, it will take longer and longer to compile this list.
Anonymous
Diff:
The underlying SQL query was rewritten to use the IN clause in edit/edittags.py 1.10, which resulted in near-instantenous retrieval of the tag list. Installed in r2013-85.