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Attach onEditCell event cause performance issue

Hello, there is a performance for dhtmlxGrid.

Here is my code:

mygrid.loadXML("xml/yyy.php,function(){

    mygrid.attachEvent("onEditCell",function(stage,id,ind,new_v,old_v){
    var return_value=true;
handling_row_id=id;
handling_cell_index=ind;
.
.
.
return return_value;});

My data is around 55 rows, but if I include the code "mygrid.attachEvent...." the page will spend around 30 sec to display. if I remark the section of attachEvent. the period will reduct to 6sec.

Is there any way to reduce the display time?

onEditCell handler executed only when cell edited, it doesn't executed during initial grid loading , so it must not affect grid loading performance.
If problem still occurs for you - please provide any kind of sample where problem can be reconstructed, you can send it directly to support@dhtmlx.com

>>if I remark the section of attachEvent. the period will reduct to 6sec.
Actually the 6 second for 55 rows is quite a big time as well, it must not take more than 1 second to render such dataset  in normal case