What's the time-consuming part of the editing? Is it the creative part where you create the story and are finding the red line? Is it because the footage lags, during playback, due to lack of computer power? Or is it when you export the video?
You can use proxies to remove the lag during playing while editing.
If your problem is because the export takes a lot of time, you can try with more RAM in your computer or to reduce the size of the footage from 4K to 1080 (HD). If using Premiere Pro (that's the editing software I've experience in using) it's also possible to change the settings, so you decrease the quality of the rendered footage and thereby the time it takes to export it.
Does that answer your question?