Translation of Empfindlichkeit

One of the users claimed that the speed of the website on facebook was very slow. Did you experience the same issue? Yes, I've also noticed that the site is a little slow, but not so slow as to find it necessary to advise you.
I have three children, Michelle, Cathy and Joe. Unfortunately, my parents do not live in the area. I am glad that they visit every 2 weeks, although they are already over 70 years old.
I have problems with adjectives, endings and articles. The grammar is so difficult. I am very happy to learn Spanish with you. What went wrong with the lessons? Thanks and best regards.