File Upload - Dwindling connection

I'm having big problems with uploading jpeg pictures from a calling form. What happens is that the htpps connection begins (usaully at a very low transfer rate -- somewhere around 900 b/s, and then dwindles rapidly to 200 - 20 -10 b/s). The file doesn't appear in the upload or temp directory (file size was in the test case 500 bytes). I've properly encoded the page: <form action="pix-upload.php" method="post" enctype="multipart/form-data"> The actual upload code is placed almost at the beginning of the page (just after calling session_start). The code: <?php if ($_FILES['pix']['size'] > 0) { if ($_FILES['pix']['type'] == "image/jpeg") { $pix_file = $_FILES['pix'][name]; $pix_temp_file = $_FILES['pix']['temp_name']; $new_pix_file = "{$_SESSION['rid']}-{$_SESSION['sid']}.jpg"; if(is_uploaded_file($pix_temp_file)) { move_uploaded_file($pix_temp_file, "pix_holding/$new_pix_file"); copy("pix_holding/$new_pix_file", "pix/$new_pix_file"); } } } ?> Any ideas what what might cause a connection to dwindle and die like this? I can upload/download anywhere else except with this code. I'm using a Unix box, as well s my IP. Directory/file permissions are OK and set to 755. Tia, Andre