Chiming in that editing with proxies, while potentially cumbersome, is pretty standard. Feature films and TV shows are often edited in 720p for that exact reason. ProRes or h.264, depending on your needs and capabilities. Final renders are just a matter of turning the proxies off.
I dabbled in kdenlive for half a day while looking for something my nephew could use for a school project. Didn’t realize the lack of hardware acceleration until this thread. Still, it’s a great piece of software and I’m looking forward to watching it develop further
That was me. My mistake.