But I work in such areas so here's the short explainer. To compress on the fly takes a lot of horsepower so the work is lightly compressed and later you can put it through a better compressor.
I have recently started recording videos of my games using the Game Bar in Windows 10. However the space the videos consume is suprising for their length. A 10 min video consumes between 2.6 to 3 GB and a 20 min video more than 7 GB. Considering that 2 hr long movies in 1080p consume less than 3 GB, I am surprised. Is there a way to lessen the space taken?