What is great about WordPress is that you can use Plugins to customize your website the way you want it. There are so many plugins available in WordPress and what is tempting about it, is that most plugins are free. In fact there are more than 21,000 free plugins available in WordPress.
However, that doesn’t mean that you have to use it all. There are reasons you need to select only the best free plugin available and choose as less plugins as needed. It is because a lot of plugins will affect the way your website performs.
Do you really want to know why? Here is the link to help clear things up: http://wphacks.com/how-using-too-many-wordpress-plugins-can-kill-your-website/