I can confirm the same issue; installation via the alpha 2 32bit alternate media takes ~2 hours when installing to a btrfs partition, compared to ~15 minutes to ext4. I'm not sure that system specs are necessary, because I don't think this is a bug (or if it is, it should be addressed upstream).
There's an old thread on the linux-btrfs list[1] which mentions a similar problem, so perhaps btrfs' performance characteristics are unfavourable towards file activity related to package unpacking/installation.
I can confirm the same issue; installation via the alpha 2 32bit alternate media takes ~2 hours when installing to a btrfs partition, compared to ~15 minutes to ext4. I'm not sure that system specs are necessary, because I don't think this is a bug (or if it is, it should be addressed upstream).
There's an old thread on the linux-btrfs list[1] which mentions a similar problem, so perhaps btrfs' performance characteristics are unfavourable towards file activity related to package unpacking/ installation.
[1] http://<email address hidden> /msg03104. html