When I built the PC it was the 12'th fastest desktop machine in the world (or listed on HWBOT anyway).
As for CyanogenMod, it's not that they are slow, it's that there is a lot of work that needs to be done to get CM10.2 working. Unfortuantely the source for 4.2.2 released by Google is full of bugs and from what I've read, won't even compile without modification, and CyanogenMod aren't willing to compromise quality to rush a ROM out.
With the new hosting, OTA downloads of SentinelROM should be much faster, but we'll find out when I release a new version.
Be sure to check out our new/free Android game - Can you be the Wheelie King?