Your systems have the minimum requirements for editing 4K. Minimum is not good or recommended and means you need to limit yourself heavily. High resolution (4K) is often usually the better choice (kind of depends on what you are doing with it). The 5.3K video is good for cropping and downscaling to 4K.
Regardless of the system strength, it is recommended to use Proxy and Preview Scaling features when working with higher than 1080p. For your systems, that is essential maybe even for HD editing. There is a tutorial on our Tutorials page about those features as well as Documentation - English pages here if you search by those feature names.
As for the crashing, there have been some crash bugs found in the latest release, and there is a beta you can try for the next release due by the end of the month
Thank you for the information.
I have enabled proxy and the Preview scaling.
Only downside is now that i need to wait longer for the proxy to be created so i can start editing the videos.
For the exporting part, I’m not that concerned if it takes longer, as i can leave the computer turned on while processing.
For the gopro videos you can plug in the memory card directly into your computer and copy both the .mp4 and .lrv file which is an already made proxy-like file and will be automatically loaded* by Shotcut (when you enable proxy). You can then easily edit on these and export will use the high quality files.
*make sure you add the original .mp4 to Shotcut, not the .lrv files