Large Collection Performance in Entity Framework and EF Core 

For many years now I’ve advocated not using the repository pattern on top of an ORM such as Entity Framework. There are many reasons why that I’ll try and cover throughout this post based on ways that I’ve seen it implemented. Meaning, this post is talking about poorly implemented approaches or pitfalls that I’ve seen. 

we want to explicitly recommend you against trying to update any applications you have in production to this preview. 

Migrating from Entity Framework 6 to Core 

the main goal of this release is to facilitate migrating existing applications that use EF 6 to .NET Core 3.0 

Announcing Entity Framework 6.3 Preview with .NET Core Support 

Some Unofficial ORM Benchmarks