I would like a solution to present a list of posts in a category with a title and an image for each post. This list will be displayed on a post and not on the sidebar. It is important that the solution does not slow the site down as some of the cateogries have many posts.
I would like to be able to choose on which posts I want this to appear (i.e. it should not appear automatically on each post/page) and also the category number from which the posts will appear.