pdf button is taking to much time to response in 3k+ row to export

rajmalviya

"oTableTools": {
"sSwfPath": "assets/js/plugin/datatables/swf/copy_csv_xls_pdf.swf",
//"sSwfPath" :"http://cdn.datatables.net/tabletools/2.2.2/swf/copy_csv_xls_pdf.swf",
"aButtons": [
// "print",
{
"sExtends": "print",
"sButtonText": "Print",
"mColumns": "visible",
"sMessage": "List<i>(press Esc to close)</i>",

                        },
                        {
                            "sExtends": "collection",
                            "sButtonText": "Export",
                            "aButtons": [
                                {
                                    "sExtends": "csv",
                                    "sButtonText": "CSV",
                                    "mColumns": "visible"
                                },
                                 {
                                    "sExtends": "xls",
                                    "sButtonText": "Excel",
                                    "mColumns": "visible",

                                },
                                 {
                                    "sExtends": "pdf",
                                     "sButtonText": "PDF",
                                     "mColumns": "visible",
                                     "sPdfOrientation": "landscape",
                                 },
                            ]
                        }   
                    ]
                },