Well ... I can tell you that Pi 2 + Arch rocks !! Runs very very fast compared with the normal Pi.
Also very nice to see all CPU-cores working to get things done.
I am now compiling FPC and Lazarus (Pascal RAD IDE), while at the same time running headless a vnc server and browsing the internet with FireFox. No problems at all !!
And running a cloud server like 'OwnCloud' is now a breeze !!
Owncloud still not that fast on RPi2. I use Apache as server. And run directly from SD-card. I will test again with external (SSD-)disk, and perhaps a faster server.