Global renames are being really, really, slow. See https://logstash.wikimedia.org/goto/576d8bc431184d815976416b3bfc2a3a for an example, long delays between renames - the rename itself to be rather quick.
Also see https://grafana.wikimedia.org/d/000000400/jobqueue-eventbus?orgId=1&fullscreen&panelId=15&from=now-7d&to=now - our processing backlog seems to be much higher than few days later.
Original description
https://meta.wikimedia.org/wiki/Special:GlobalRenameProgress/User1692 is stuck even after 3 hours.