Grant Fritchey (8/25/2014)
Instead of downgrading, I'd suggest tuning the queries and structures so that they perform better. There's not a massive known improvement in performance between most SQL Server versions. Rather it's incremental along with additions to behavior with the newer versions.
Seconded.
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability