Bad preview of 4k video

[Mehdi Haghgoo]

Hi
First of all, I know that Kdenlive is a great piece of software and I appreciate the hard work put into it in the past and at present. I have done some video manipulation with ffmpeg and I know video editing software is a big deal. Also in comparison with other Linux software like Lightworks, it is all free and fullfeatured. It's ridiculous that Lightworks Free version only allows h264 and up to 720p export!
I have a small problem though, Kdenlive is bad at previewing in-edit tracks especially for high-res videos like 4k and when layering multiple tracks. It just plays with a lot of hiccups. I have low end laptop: core i5 6200u dual core with Intel 520 graphics.Is there a way to improve the performance in future versions or are there any plans? I have not tried kdenlive with a discrete graphics. Maybe, these issues are not present on powerful systems.  

Again thank you for your great work. I would love this message to be seen as a query and suggestion at its best. 
Looking forward to hearing your thoughts. 

Best regards- mehdi
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