> On a low power machine you should use proxies.

Sure, but this same hardware was able to edit 1080p / 30 fps videos on Windows without performance issues and not needing to use proxies. Camtasia let me edit videos liquid smooth even if I added different effects. I never encountered a single video that lagged when scrubbing, even 90 minute videos with a dozen tracks. Resolve was also fine.

Kdenlive on Linux is mostly ok but even adding the most basic effects will cause a slideshow when scrubbing and during normal playback in the preview window. I don't know how Resolve will run on Linux since I haven't attempted to install it due to the codec issues (a deal breaker for me on its own).