not sure if I got it rigth
- is the layout sorted?
- there is a bug (at least under Windows) that causes FM to redraw when the format bar is activated/deactivated
There are no 'auto-enter' calculation in the Name_Last field.
Auto-enter calculations would not slow your sorting, it would be non-stored calculations that would slow your sort because non-stored would have to recalculated for each record.