Just posting to say I've noticed and am investigating. It seems that somebody is performing a scrape of the front page which includes a list of users on the site [1] each of which is a link to a search query for all tickets and wiki pages associated with that user. That's what's causing the slowdown.
The IP address seems to belong to Opera (maybe it's a VPN?) http://tools.tracemyip.org/lookup/107.167.122.77 [1] https://trac.sagemath.org/#AccountNamesMappedtoRealNames -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at https://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.
