[odinserj]

I've also used BLToolkit, and it is pretty fast too, plus it has Linq support to build strongly-typed queries that sometimes better than raw SQL queries. But when it comes to table hints, Linq and other stuff does not help. So, it always depends :)

[radicalbyte]

BLToolkit and the replacement (linq2db) are great. Excellent performance and it has some excellent developers contributing.