No, VSFelxGrid is a good control.

You are using severl functions (I.e. on stogrid_AfterEdit):

- SearchUOM
- UnQuote
- checkFG
- SearchFG
- checkinventory
- ComputeSalesTotal

and a cicle that, of course, increases the time it takes for each new entry and change:
- For i = 1 To stogrid.Rows - 1

So I suspect that the cause of the slowdown may be caused by these.
But this functions are missing in your code, so we don't know what does.