Encountered similar issue. According to apple documentation - "An image renderer keeps a cache of Core Graphics contexts, so reusing the same renderer can be more efficient than creating new renderers." Looks like the context is cached for subsequent operations. There is also a stackoverflow post that discusses on crashes due to image scaling using high memory - https://stackoverflow.com/questions/61263161/why-use-a-lot-of-memory-when-drawing-image-with-uigraphicsimagerenderer?rq=3