I'm fairly sure that Windows Store apps have to be written in UWP (Universal Windows Platform) which would mean a complete rewrite of the application. So who knows maybe it'll improveNow they need to re write it, so its not slow on windows..
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Let's just wait for the rumored replacement of iTunes, perhaps that'll be a complete rewrite.If they re-write it from the ground up so its not so bloated, then this would be a good thing to do. However, I do not see that happening anytime soon.