Required library edition:
Required library file: dhtmlxgrid_fast.js

start fast operation mode, in such mode events are not generated, some time consuming actions applied only once, which allow to increase performance

   mygrid.startFastOperations();
 
   for (var i=0; i<1000; i++)
       mygrid.addRow(mygrid.uid(),[i,"new row"]);
 
   mygrid.stopFastOperations();

See also: stopFastOperations, enableSmartRendering, enableDistributedParsing