export button dispplay sppiner have dellay

NIkflipflop

I have a lot of data, It is 10 000 itmes.
I press export to CSV button sppiner show only after 5 second.

I add custoem code
{

                    extend: 'csvHtml5',

action: function (e, dt, node, config) {
this.processing(true);
setTimeout(
() => {
$.fn.dataTable.ext.buttons.csvHtml5.action.call(this, e, dt, node, config);

                            }, 100);

                    },

Now it work good,
this.processing(true); -- it is add class '.processing' to button