Does anybody know how to improve ef core performance? I have so many .

Thank you all

Please share few screeshot of your code, and explation your query in detail, so we can understand your query.

You should use AsNoTracking() if your query for read purposes. Also you can specify anonymous object to select only required properties. Your tables should have indexes on foreign keys. It's basic advice, if you share the query maybe someone will help you more. And also check how your query is translated into sql. There're some tricky things, sometimes this behaviour is implicit. It's possible that part of your data (for example, filtering) processed on the server