Checking Pagerank with PRChecker.Info is really boring

PRCkecker site is considered as the web's best Pagerank Checker (according to the search engine of Google.) So, i use this site to check the page rank of a site but their implementation of the Verification code made it more lengthy and boring. Sometimes they shows error while loading and sometimes takes a huge time in loading.sometimes it shows the error after a long process if the verification code is not typed properly.

I am really not happy with such an implementation of the site security. But i still didn't understand why these security code is needed for such checking tool site.