When using a chrome launcher, the browser only uses about 30MB, even I can miss that much although I only have 1 GB RAM. The only visible difference with a native client would be the title bar, but the chrome one doesn't look that bad either. As for the graphics, my lowsy computer still manages to run Runescape HD in full screen with about 39% CPU, so I still have quite some processing power left. I don't see the need for crazy optimizations, I'd rather have them focus on content.