Remote File download is very slow

Hello folks, I have written a method to download file from remote server. normally those fill will be huge in size. from 1MB to 400MB. I am using fsockopen and curl to download the file. But the problem is its too slow. Very very slow. The code can be found on http://nopaste.info/55817730b3.html I just put the method body. Can any one help me on increasing the speed? Thanks in Advance -- http://talk.cmyweb.net/ http://twitter.com/shiplu