Thank you for writing.
We have recently made improvements on the image loading in the example of the SlideLayout in RadListView. The updated version will be released in the following days.
Regarding the response time, you can have a look at our support policy for answering customer tickets
You can also have a look at the important information
about using our forums and pay attention to the part that "A post in the Forums doesn't guarantee you a response from the Telerik support team although 95% of all posts are eventually addressed. Additionally, a post is not assigned a response time as with the support ticketing system
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Feedback Portal
and vote to affect the priority of the items