I just found this as I have been using Kdenlive on Ubuntu and my very old PC struggles with rendering. It may be time for an upgrade and it may be worth getting some reasonable GPU even though I'm not a gamer. My PC has an AMD A8 with some sort of Radeon graphics built in, but I know that's nothing special.
Recently I did a video that mixed up 4 videos at once and that slowed things to a crawl. I learned that you can transcode to something low res for the editing part, but of course that took a while. It is a cool app that can do all I need for video.
Actually my search found this post on Waivio. Hive posts will appear on several sites.