The current version of Webcam FTP Service does have some limitations. We are working on a much more powerful version now and will be renamed as "Virtual Security Camera System".
If you have Windows 8, you can also try our new "Webcam Security Camera" for Windows 8.
You can also use a smart phone or tablet as a security camera by installing our mobile security camera app.
Otherwise, you can downgrade it to 1 image/sec. Sorry for that.