Projects::MilestonesController#sort_issues is slow
As per New Relic (https://rpm.newrelic.com/accounts/543063/applications/4968123/transactions#id=5b22436f6e74726f6c6c65722f70726f6a656374732f6d696c6573746f6e65732f736f72745f697373756573222c22225d&sort_by=slowest) this method sometimes spends up to 35 seconds processing a request. Most of the time appears to be spent in SQL queries. Some screenshots: