The performance will be the expected one if you just use the Count() LINQ method to extract the total number of records from the database for a specific entity. Then you should again use LINQ with the Skip() and Take() calls so you can extract the exact records that you want to show in the UI.
count = context.Products.Count();
IList<Product> pageOfProducts = context.Products.Skip(10).Take(10).ToList();
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