Thanks for sharing. Suggest that the options setting be left at Default so GPU can be utilized. Much faster.
It appears that huge, nearly 5K resolution files are more than VP can handle. Recording at a lower resolution is worth considering.
Re-encoding these large files to a lower resolution - a process in itself that takes some time - will speed editing and cut export time. Try Prism.
The two large files were reduced to 4K, and your project handled well. (No need to wait for caching ribbon completion.) There was little, if any, discernible quality loss, IMO.
When dealing with large/hi-res content, proxy editing is a common practice with NLEs. Proxy FAQ
4K HEVC export time was estimated to be about 20 minutes. AVC encoding could take half the time.