First, I do hope you understand that Apple being ... well, Apple ... the OS and FCP are 'juiced' to work better in some parts of video post than outside apps can. So there's that to begin with.
Second, you don't say how many cores for the CPU, but you've only 16Gb of RAM. And are running long-GOP media from a drone. That's produced of course by dedicated chips in the drone that quickly reduce the pixels of the sensor to an occasional complete but highly compressed " i-frame " and all other frames are simply data-sets of pixels that change after or before i-frames, and some of the drones even do partial i-frames extending the mess farther.
For all non-i-frame 'frames', the CPU has to decompress & store to RAM all relative i-frames, then recall the datasets of the p/b frames, recall the complete frames from RAM, compute each frame, then pass the frames along.
The basic suggestion for hardware for best long-GOP playback is as close to 10 cores as you can get, with a CPU processing speed as close to 4Ghz or if possible faster, with 10GB of RAM per core.
If you can't make that, and realistically, even if you can, you probably will want to use the PrPro Proxy process for most editing with long-GOP media. Use the Cineform preset that's included, don't worry about matching frame-size just aspect ratios (as in 16:9 or whatever).
And look up on the Adobe website for the video tutorials they have on using Proxies. They're fast and quite useful.
Neil
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