BulkInsert...When you want to insert hundreds, thousands, or millions of entities using ...SaveChanges()... method, you will notice that your application performance is INSANELY slow....The ...SaveChanges()... requires one database round-trip for every entity to insert....For example, if you need to insert 10000 entities, then 10000 database round-trips will be performed and your application suffers from performances issues....BulkInsert...Entity Framework Classic provides an extension method ..