Search for "long-GOP video files" maybe. This format is great for fast compression and writing to card in-cam as they have specialized chips in the cameras for that. But the GOP is "group of pictures". Which to me is a total misnomer.
You actually only have a complete frame every 9-30 ... or in the case of GoPro's, maybe even 100 or more frames. Those are called iframes.
In-between, you have data sets in table format of 1) the pixels that have changed since the last iframe 2) those that will change before the next iframe or 3) BOTH. GoPros are even throwing in partial iframes now.
So to play it back, the NLE has to decompress and decode and fully recreate up to 100 frames of video ... just to play the next frame. Yea, that's a load.
It's far easier on the system to play 6k RED raw files than UHD GoPro files. Most of the pro colorists I work with don't like working with long-GOP clips at all. When the drives come in from a client, they see any long-GOP, that gets transcoded right off to maybe ProRes422 or a DNx format. And they work on systems that make yours and mine look puny.
For reference, I've got a 3960X Ryzen ... 24 cores, 128GB of RAM, and a 2080Ti with 11 GB of vRAM. And that's because I don't need to work with much long-GOP. And am willing to proxy or t-code if needed. If I were going to work with a lot of long-GOP, I'd use a newer Intel CPU with the internal hardware to process the stuff.
I don't think your rig has much long-GOP capability ... but that's why I asked about RJL. That user knows that stuff cold.
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