There's no doubt that Entity Framework with LINQ is great (I've certainly written enough articles about it). But Entity Framework comes at a cost. As Matthew Jones points out on his blog, using LINQ+Entity Framework adds time to each data retrieval compared to using ADO.NET's SqlDataAdapter. The cost is small (anywhere from a third of a millisecond to 100 milliseconds) but it's not zero, either.
If speed is important to...
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