Microsoft new IE7 browsers include a form of anti-phishing technology, by which a site may be checked against a list of known phishing sites. If the site is a suspect the user is warned, although not prevented from visiting it. This phishing technology has made the browser (IE7) become more heavy. Browsing speed becoming a little bit slower and it effects the overall performance of the browser itself. Spam filters also help protect users from phishers, because they reduce the number of phishing-related emails that users receive.