just share my noob experience.. lol
I use intel celeron, it takes 20 minutes to render 2K video with 50 seconds duration :D
but before this, it was impossible.. so I googling then found that h.264 is bad for editing
and then I change to ProRes 422 in MLV app and get much better with 2K in editing.
for uploading to youtube I convert the video to mp4 with h.265 codec.. here it is:
ok. this is the setting I like so far
ML Raw 16:9, crop rec UHD 1x3
MLV app 2048 x 1552 ProRess 422 HQ
I think this gives more flexibility in editing, here is my sample video: