Video Playing In Guide: WHY?

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In this new version now when navigating thru the guide channels, there is video playing in the top right corner, apparently from the first channel listing. Also if you start watching a channel then hit back button on remote, it still keeps playing. Where can I turn this performance hog behavior off? The guide is almost already unusable because it is so slow navigating, AND YOU ADD MORE THINGS TO IT TO MAKE IT SLOWER?

Could you mention your TV brand and model?

Sure. LG UH8500 running LG software version 5.65.03

Sure it is an older TV, but the app should be smart enough to know that and not try and over tax it, or simply provide user a way to disable those things.