Hi, Please help me in understanding the robocopy command. Below is my scenario. I wanted to copy 183 GB file from one folder to another. Copy command was taking 28 Min to copy the file. robocopy command took 22 Min. I used the option /COPYALL /MT /Z But CopyFile() api took only 18 Min. My question is, (1)is there any api for robocopy that I can used to see performance improvement aginst copyFile api? (2) What could be reason for CopyFile() api being faster than robocopy ? This is a blocker for me. My current code is using CopyFile api. I want to replace it with robocopy. Thanks in advance for the help.