I am trying to view KrBot's contributions on Wikidata. I can get as far back as the last 5,000, which is the maximum number of contributions that can be shown on one page. However, loading the 5,001st contribution results in a timeout. Surprisingly, loading only the 2nd contribution also results in a timeout, even though this is not an issue if the most recent edit is at the top of the list. Using an offset date in 2009 (before Wikidata's creation) also results in a timeout for KrBot.
This is an issue for users with as few as 160,000 edits to Wikidata. For comparison, on the English Wikipedia, this is not an issue even for users such as Koavf (approximately 2,020,930 edits).