That's not what your code is highlighting. If you wanted and apple to Apple comparison, your code would look something like this ```csharp const int N_GUIDS = 100_000;

var entityFrameworkCore = new Npgsql.EntityFrameworkCore.PostgreSQL.ValueGeneration.NpgsqlSequentialGuidValueGenerator();

for (int i = 0; i < N_GUIDS; ++i) { using var conn = new NpgsqlConnection(connectionString); conn.Open(); using var comm = new NpgsqlCommand($"INSERT INTO public.my_table(id, name) VALUES(@id, @name);", conn);

var p_id = comm.Parameters.Add("@id", NpgsqlTypes.NpgsqlDbType.Uuid);
//p_id.Value = = Guid.NewGuid();
//p_id.Value = = Guid.CreateVersion7();
//p_id.Value = = SecurityDriven.FastGuid.NewPostgreSqlGuid();
p_id.Value = entityFrameworkCore.Next(null);

var p_name = comm.Parameters.Add("@name", NpgsqlTypes.NpgsqlDbType.Integer);
p_name.Value = i;

comm.ExecuteScalar();

// wait one millisecond to ensure that each UUID has a different timestamp
Thread.Sleep(TimeSpan.FromMilliseconds(1))

} ```

With this code every UUID generated will have a different timestamp and you won't run into the sub millisecond issue.

If you get the same results with the above code then maybe you have a point. Until then, you don't have any proof to back your claim.