The media you're working with is camera capture stuff, with an amazing specialized chip in the camera to condense & write that data to file quickly. It's also long-GOP, and as 4K long-GOP, some of the hardest stuff for computer NLE processing available.
Then you are applying Warp stabilizer, which has to first compute what every frame should be, through an entire clip, store that to cache/RAM for any playback.
And using Lumetri, another HEAVY effect.
You probably don't want to hear this, but unless you've got some of the most amazing computer hardware made, you're not getting smooth playback with all that at once. Even then, doubtful.
I work for/with/teach pro colorists, who have more in their calibration gear than most of us have in our full systems. And run "heavy iron" with like 256GB of RAM, massive GPUs, high-speed RAIDs directly attached to their computer for all media/project files.
THEY hate working with long-GOP media, in Resolve. Mostly they immediately transcode it to ProRes or DNx before bringing it into Resolve to grade. Or make proxies at least.
I've got a 24 core CPU, 128GB of RAM, and a 2080Ti. I couldn't possibly get decent playback with that media and effects. And yes, I'd t-code to ProRes or DNx most often.
Even then, I would never apply Warp and any other heavy effect to a clip. I would typically apply Warp, get a good result, then do a full Render & Replace on the timeline to ProRes. Then with that new ProRes clip, I'd apply Lumtri and or other effects.
Neil
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