You're right about 2.4GHz limitations, although the network card can be easily swapped with a cheap 802.11+BT5.0 module that cost 20 euros. On performance, I don't know about that CPU, but consider how much is gained by running binary code natively rather than Java apps in a virtual machine; even the oldest smartphones out there would fly, had their manufacturers published enough information to have a Linux distro running on them with enough hardware support.