YUM base system install

Benchmark profile:
- YUM installroot=/opt

In the pursuit of a new real-world use case to test, I measured the time needed to do a chrooted base system install via yum. In other words, I instelled a Fedora base system inside the benchmarked partition. How much time will need yum to populate this new system install?

In a interesting twist (compared to untar/cat), EXT4 is the leader and BTRFS the worst.