Yes, its slow and its ARM-based. So if you want things to just work (tm), N100 is a much, much better choice. You don't have to fiddle around with the configs to reduce writes to the SD card, figure out how to fix issues with ARM ecosystem, yadda yadda yadda.
It also limits what you want to do. For example, it is simply not powerful enough to run a smooth personal computer (video watching + light browsing).
Is it that the pi is slow?
I'm not trying to disagree, I just don't see the savings everyone in this thread is claiming.