I was having an issue where intellisense would hang for half a second intermittenly whenever I would try to write queries, even a one line select statement. I thought it was Sql Complete. It turned out that the default intellisense was re-enabled after the sp2 update. I just had to disable it (Tools -> Options -> Text Editor -> T-SQL -> Intellisense) and things are back to normal again.
Posting this just in case anyone else is having this issue.
Sql complete Intellisense slowdown after installing SQL Server 2012 SP2
Re: Sql complete Intellisense slowdown after installing SQL Server 2012 SP2
Thank you for letting this know.