Brent Ozar checks out the list:
Whenever a brand spankin’ new version of any software comes out, there are bugs, and SQL Server is no exception. This has led to a mentality where folks don’t wanna install a new version of SQL Server until the first couple of Cumulative Updates come out, hopefully fixing the first big round of bugs.
So… are there bugs this time around?
Read on to see the list. Though I will note that the SQL authentication logins being slower isn’t a bug. It’s a consequence of improving security via PBKDF2 and cranking up the number of iterations. On net, this is a good thing because it makes brute-force password attacks orders of magnitude more difficult while having negligible impact on legitimate users. In the post Brent links, Vlad Drumea has a comment talking about going from sub-1ms to 150ms per login attempt in his tests, and the neat thing about PBKDF2 is that it scales linerally with number of iterations, so as hardware gets faster and faster, you can increase the number of iterations necessary and maintain a fairly standard range of login times.