It doesn't consume significant system memory as it utilizes native system functionality.
You may have to scroll through the entire gallery to find a specific target image. User Perspectives Folder Icons 1.3
Some users find that using external apps can occasionally involve more steps than native OS methods for simple image swaps. It doesn't consume significant system memory as it
“It really should be a standard MS feature and come installed with... it includes everything one can imagine to customize a folder's icon with minimal effort!” Trustpilot Folder Icons 1.3