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Unfortunately, several traps that are easy to fall into have given it a reputation for performing poorly; but it doesn’t have to be this way!The performance of Entity Framework may once have been inherently poor but isn’t any more if you know where the landmines are.There’s a database with two tables for Schools and their Pupils, and a Win Forms app using an EF code-first model of this database to fetch data in a variety of inefficient ways.To play along at home, you can grab the code for most of these examples from Framework School System – setup instructions are included in the readme.There are a couple of different approaches available.The first is to use the Eager Loading data access strategy, which fetches the related data in a single query when you use an Include() statement.By far the biggest performance issues you’re likely to encounter are of course around accessing the database. At its heart, Entity Framework is a way of exposing .

This happens because by default, EF uses a loading strategy called Lazy Loading, where it doesn’t fetch any data associated with the virtual Pupils property on the School object when the first query is run.Sometimes you don’t need to bring back this additional data.For example, if we just wanted to get a list of Schools in New York with more than 100 pupils (but not caring about exactly how many pupils there are), a common mistake would see us write: By taking a look in ANTS at the query which has been run, we can see that a lot more data than the first and last names (First Name and Last Name) has been retrieved.If you subsequently try to access data from one of the related Pupil objects, only then will it be retrieved from the database.Most of the time that’s a good idea because otherwise any time you accessed a School object, EF would bring back all related Pupil data regardless of whether it were needed.

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