dwsuser on "[Plugin: Contact Form 7] First Byte Captcha"

When activating the Really Simple CAPTHCA, First Byte takes a bout 30 seconds to load the website. If I deactivate the captcha, the site loads about 4 seconds. Any ideas as to why this is occuring?

IIS 6, Wordpress 3.6, Really Simple Captcha 1.7 and Contact Form 3.5.2

http://wordpress.org/plugins/contact-form-7/