Piotr,
maybe it is the remote data call/population of the listbox arrays?

for comparison try:
- populate the listbox from local (4D) data

On Mon, 4 Dec 2017 07:59:00 +0000, Piotr Chabot Stadhouders via 4D_Tech 
wrote:
> 
> I tested this on an HP Intel Core i7-4710MQ 2.50GHz laptop with 24G memory
> When showing the listboxes for the first time the arrays have 0 
> elements (after on load they are populated via 4D for OCI commands)
> Maybe it does matter how many listboxes are on the form?
> Maybe LISTBOX INSERT COLUMN becomes slower when more columns are inserted?
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