Thanks for the information. It's really helpful 😀
However, I've decided to go back to the old version as the newest version doesn't have icon of speed change of clip anymore.
Hopely, radial blur and rotational blur work well with 4K footage too. So far, they don't. Exported clips just show black even with the newest version of the software. However, they are rendered properly when the resolution is 1080hp or below. Correct me if it's not what is supposed to be.