Entity Framework query slow, but same SQL in SqlQuery is fast

Question

I\'m seeing some really strange perf related to a very simple query using Entity Framework Code-First with .NET framework version 4. The LINQ2Entities query looks like this:

Answer 1

I also came across this with a complex ef query. One fix for me which reduced a 6 second ef query to the sub second sql query it generated was to turn off lazy loading.

To find this setting (ef 6) go to the .edmx file and look in the Properties -> Code generation -> Lazy Loading Enabled. Set to false.

Massive improvement in performance for me.