Performance of PHP

Hi there, I am doing some image cropping of about 40.000 files with php. To do this I wrote a PHP file that does what I want and I did disable the timeout so I can call it via webbrowser and fire the script. There are two down sides I see: 1. One image takes about 0.25 s, so the whole process would take about 3 hours. 2. During that time a spider could come along and find that file and fire it again. Is it faster if I would issue this by command line on the linux server? php filename.php Thank you for any help, Merlin