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RowList with a lot of content on the top of a video - lower devices

Hi all,
I am trying to implement a screen with a full screen video on the background and a RowList on the top of it.

The Rowlist's contentNode is populated by an api call, so it can have a lot of rows and elements in one row. Each item has a full size (item sized) poster in it.
How can I optimise this for lower-end devices? It is running smooth on Roku 3 but on Roku Streaming Stick (3500X) it is very poor and all the posters are "flickering" so these are reloading all the time. 
I am guessing that I want to display too many Posters at the same time. I guess I need to stop them rendering once it is not visible.

On the RowList I have set numRows="2" and numColumns="2", but did not help.
Same for each Poster's loadWidth, loadHeight, enableRenderTracking, renderTracking. No success so far.

Do you have any suggestions how to optimise the structure for old devices?

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