Sometimes you want to make a subview have rounded corners. An easy way to do this is:

v.backgroundColor = bgColor
v.layer.cornerRadius = 7
v.layer.masksToBounds = true

This works well most of the time, but you run into performance degradation when you render more complex subviews with rounded corners, e.g many UILabels with rounded corners in a UITableView with many cells.

An easy way around this issue is to switch of masksToBounds and set the background on the layer instead of the view:

v.layer.backgroundColor = bgColor.cgColor
v.layer.cornerRadius = 7

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