I noticed today that the saving of edits takes a very long time, at least much slower than earlier this week. It's most obvious to observe if you update a whole bunch of labels and aliases and you press save. You can see this in https://www.wikidata.org/w/index.php?title=Q2825156&action=history . I did all my edits and pressed save. The first part is saved 11:42, 3 May 2015 and the last one 11:44, 3 May 2015 so this took over one minute to complete!
I also notice that my bots appear to be editing slower than usual.