Before we going to talk about website User Experience (UX) , let’s understand it’s definitions.
User experience (UX) is a person’s emotions and attitudes about using a particular product, system or service. It includes the practical, experiential, affective, meaningful and valuable aspects of human–computer interaction and product ownership. Additionally, it includes a person’s perceptions of system aspects such as utility, ease of use and efficiency. User experience may be subjective in nature to the degree that it is about individual perception and thought with respect to a product or system. User experience varies dynamically, constantly modifying over time due to changing usage circumstances. Simplified, user experience is about how a user interacts with, and experiences, a product.Wikipedia
So What are you understand from this definitions?
Yes! User experience is related to your customers or website visitor emotions, feelings & attitude when visited your website.
How about if your website visitor comes to your website, they must wait for 30 seconds to let your website fully loaded?
How about if the website visitor was you?
Your website visitor and you will be fed up, unhappy and angry. They will left your website and never come back again!
That’s one of the User Experience (UX) !