Entity Framework Slow queries

[Problem]
Working with entity framework might be slower while using groups and complex calculations.

[Solution]
Dive your the query in small groups.
1. A select query should be just grab select data
2. then apply group in separate query.

ex;

var query = from r in sometable
select r;

var complexQuery = from res in query.AsEnumerable()
group res by new{ res.id, res.somCol}
select …..

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