Why is CF FTP transfer speed multiple times slower than standard FTP?

Question

I have a ColdFusion application that I use to transfer files between our development and production servers. The code that actually sends the files is as follows:

ftp = new Ftp();
ftp.setUsername(username);
ftp.setPassword(password);
ftp.setServer(server);
ftp.setTimeout(1800);
ftp.setConnection('dev');
ftp.open();
ftp.putFile(transferMode="binary",localFile=localpath,remoteFile=remotepath);
ftp.close(connection='dev');

When sending a file using the above code, I cap out at just under 100KB/s(monitored via FileZilla on the receiving server). If I send the exact same file using the Windows command-line FTP tool, my speeds are upwards of 1000KB/s.

I created a brand new file with nothing but the code above and that has no effect on the transfer speed, so I know it has nothing to do with the surrounding code in the original application.

So, what could be causing these abysmally low speeds?

Edit: All tests are being done transferring files from my production server to my development server. I also tried using the <cfftp> tag instead of cfscript, and I have the same results.

Edit #2: I ended up using cfexecute, the code is as follows:

From my FTP script:

public function sendFiles(required string localpath, required string remotepath) {
    this.writeFtpInstructions(localpath);
    exe = "C:\Windows\system32\ftp.exe";
    params = "-s:" & request.localapproot & "/" & "upload.txt";
    outputfile = request.localapproot & '/ftp.log';
    timeout = 120;
    Request.cliExec(exe,params,outputfile,timeout);
}

public function writeFtpInstructions(required string localpath) {
    instructions = request.localapproot & "/" & "upload.txt";
    crlf = chr(13) & chr(10);
    data = "";
    data &= "open " & this.server & crlf;
    data &= this.username & crlf;
    data &= this.password & crlf;
    data &= "cd " & request.remoteapproot & crlf;
    data &= "put " & localpath & crlf;
    data &= "quit";
    FileWrite(instructions, data);
}

The cliExec() function(necessary to create a wrapper since there is no equivalent of cfexecute in cfscript):

<cffunction name="cliExec">
    <cfargument name="name">
    <cfargument name="arguments">
    <cfargument name="outputfile">
    <cfargument name="timeout">
    <cfexecute
        name="#name#"
        arguments="#arguments#"
        outputFile="#outputfile#"
        timeout="#timeout#" />
</cffunction>

Answer 1

I have been looking and I dont have an answer about why it is slower. But, in theory, you should be able to use cfexecute to do this through the windows command line. You might could even create a batch file and do it in one call.