Merge Records...How to Bulk Merge?...If you have a data (list of entities) which have both new and old records. ...SaveChanges... requires one database round-trip to check if the entity already exist and one round-trip to insert or update the entity....if you save 10,000 entities, 20,000 database round-trip will be performed which is ...INSANELY... slow....StackOverflow Related Questions...MERGE in Entity Framework...How can I use use Entity Framework to do a MERGE when I don't know if the recor...