Caching RawImage

i use some images in UnityEngine.UI.RawImage by url, and the problem is, that when i destroy and recreate GUI that content this images, its always redownloaded from site. So i try to find the way, to cached images. Does it real?

 

This is for efficiency problems?

 

efficiency and visibility, so image opens only in few second after gui open

 

All plugins that i know, work with this solution :/