The game (as is typical for anything alpha) is not at all optimized for performance. This (optimization) is something that happens very late in development. So it might indeed be that the system is a bit underpowered for the current state of the game. This will undoubtedly improve (a lot) as development progresses.
That being said, how much main memory does your system have, and how much free disk space? I tried running the game on my laptop, which has an SSD, 8GiB of ram, and some lower end intel i5 cpu and just the intel onboard graphics. On that system, the game was somewhat playable at the lowest setting at 1366*768. Going to 1600x900 makes it still work, but at say 7 fps tops - functional, but not really enjoyable.
Loading times were okay, although still rather slow, which does surprise me a little bit, as the game is installed on the SSD.