Entity Framework Core 7 is slower than Entity Framework Core 6 when executing migrations. This benchmark, which requires a SQL Server instance running locally (though it's just a matter of changing the connection string), creates an AdventureWorks like database and applies just 5 migrations to it. Entity Framework Core 7 is up to 3 times slower according to these results:
| Method | Runtime | Mean | Error | StdDev |
|---|---|---|---|---|
| Migration | .NET 6.0 | 467.22 ms | 7.899 ms | 28.819 ms |
| GenerateScript | .NET 6.0 | 83.00 ms | 0.531 ms | 1.902 ms |
| Migration | .NET 7.0 | 1,304.72 ms | 10.119 ms | 36.918 ms |
| GenerateScript | .NET 7.0 | 953.80 ms | 4.492 ms | 16.101 ms |
The GenerateScript benchmark is just limited to building the SQL files themselves, without applying them to the database, and the overhead is clearly visible there.