Yes, renaming a file is much faster and quite appropriate for things like image files. 

binmode UPLOADFILE;  
while ( <$upload_filehandle> )

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You have a potential denial of service attack when you slurp the entire uploaded file into RAM, which is why CGI recommends using read instead. 
while ($bytesread = $io_handle->read($buffer,1024)) {

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In reply to Re: CGI file upload: Print to filehandle vs move file by rowdog
in thread CGI file upload: Print to filehandle vs move file by tospo

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