For all my entity beans I used @Id(generate = GeneratorType.AUTO).

I have a loop that implements a lot of objects. I had problems of perfomance, persist method was time consumming. I just change the GeneratorType to TABLE. It makes the creation of objects 2 faster !!!!

I'd like to understand what may explain this issue ?

identity do a db lookup for every generated id
table or sequence (with the appropriate alocation size) do a db lookup every allocation size generated id