I have fought this very thing over the years on different projects with different files. I recall fighting 1080 footage not too long ago and it always felt like a hardware play. I would get the biggest machine my meager pocketbook could swing and go for it. All that being said what I have come to now "believe" is like BuzzCut alluded to the software is huge and the way it is optimized is even bigger. One thing I would do in your case is ensure that your software is using the resources you have in your machine, occasionally the software will be limited by default to only use a small amount of the power you have at hand. I current am using a 2015 MBP, and iMovie, and FCP work flawlessly for 4k footage, and oh by the way my MBP does not have a dedicated graphics card. That again strengthens my argument that the software can make a huge difference in the way it utilizes the hardware at hand. Frankly it is all a bunch of crap that sells us more hardware/software looking for the golden goose, but I digress.
When I was using PCs for video I enjoyed using Vegas, it seemed to handle resources better for me at least. (not a recommendation by any stretch)
My current machinne
The MacBook Pro "Core i7" 2.2 15-Inch (Integrated Graphics/Iris Only/Force Touch - Mid-2015 Retina Display) features a 22 nm "Haswell/Crystalwell" 2.2 GHz Intel "Core i7" processor (4770HQ), with four independent processor "cores" on a single silicon chip, a 6 MB shared level 3 cache, 16 GB of onboard 1600 MHz DDR3L SDRAM (which cannot be upgraded later), 256 GB of PCIe-based flash storage, and an integrated Intel Iris 5200 Pro graphics processor with 128 MB of "Crystalwell" embedded DRAM (and shared system memory).
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