After doing some research on the topic, we realized that HTTP compression is not appropriate for telerik.com. The main reasons are the constantly changing information and the size of the site. Probably you have used it for smaller websites that's why you did not have problems.
However, currently we use caching, which seems to be improving greatly the loading times. We constantly monitor the speed of our website and if we notice it needs some further optimizations we'll immediately take the necessary actions.