Memory continues to increase when loading images to Webview

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i loading html file loads images using javascript files webview. every time when load html file web view shows me memory increased in activity monitor. even, when release webview not release memory.

not caching resources in webview. but, when used instruments analyse memory , shows me images resources cached in memory not released.

tried load same html files in safari browser, found same behavior.

can please guide me missing? how can optimize memory loading webview?
 

webview _is_ optimising it. idea available ram free, downloading images expensive. fact behaves same in safari should hint.
 


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