c# - How to make cell formatting faster for large worksheets in EPPlus -

i have c# data processing application uses epplus write final results excel sheet. background color of rows changed based on data on row signifies. time never issue dealt files below <100mb before. however, requirements have changed , files larger, have noticed that.. coloring makes application 60% slower. removing coloring makes application faster. snippet below example of code use color data make visually distinguishing. i'm no expert @ epplus there way, can optimized make application faster? or there better ways me make rows visually distinct people end looking @ data? appreciated!

    if (data[4] == "3")                                 {                                     // color type 3 messages here                                     var fill1 = cell1.style.fill;                                     fill1.patterntype = excelfillstyle.solid;                                     fill1.backgroundcolor.setcolor(color.lightgray); }                                  if (data[4] == "4")                                 {                                     var fill1 = cell1.style.fill;                                     fill1.patterntype = excelfillstyle.solid;                                     fill1.backgroundcolor.setcolor(color.blanchedalmond);                                 } 

edit:

this code use copy template , write excel data new worksheet. p excel package convert byte array before writing excel file.

        byte[] bin = p.getasbytearray();         file.copy("c:\\users\\mpas\\desktop\\template.xlsx", "c:\\users\\mpas\\desktop\\result.xlsx");         using (filestream fs = file.openwrite("c:\\users\\mpas\\desktop\\result.xlsx")) {          fs.write(bin, 0, bin.length);         } 

here code open existing file.

        fileinfo addresslist = new fileinfo("c:\test\test.xlsx");          // open , read xlsx file.         try         {             using (excelpackage package = new excelpackage(addresslist))             {                 // work book in file                 excelworkbook workbook = package.workbook;                 if (workbook != null)                 {                     if (workbook.worksheets.count > 0)                     {                          // first worksheet                         //excelworksheet worksheet = workbook.worksheets.first();                         var worksheet = package.workbook.worksheets[1];