Read original post at Jeff Wilcox's Blog
One of the nice visuals of 4th & Mayor is the animation and display of a simple area map whenever you view a place in the app.
Unfortunately, most map controls, such as the Bing Maps control included with the platform, are highly sophisticated: they let you have a bunch of pushpins, gather information about bounding boxes, etc. This awesome feature set can have a negative effect on performance.