Currently a page with many deleted revisions (or less likely, a long deletion
always loads the entire page history at Special:Undelete. Instead, you should be
able to view a definable number of entries on one page, as with normal page
histories, Special:Contributions, and Special:Log, with links at the top:
"(Latest | Earliest) View (previous 50) (next 50) (20 | 50 | 100 | 250 | 500)."
T20687: Special:Undelete start page should list available recent items directly