Been using VideoPad since 4.x and it's always been good. But as I went from 720, to 1080, then to 4K rendering got slower. At 1080 I added a dedicated SSD drive on the mother board to act as a cache, and continued to use that until recently. Here's where I got a huge improvement. A recent hardware upgrade forced me to remove the second SSD drive and use the primary (OS) SSD drive as the cache, and rendering times went WAY down. That's contrary to what a lot of video/photo editing products say. It's a simple enough experiment if you think it might help.