LumiNet (based on attiny84)

Wow didn't know the Arduino sucks so much juice on idle.

Is this using the internal oscillator?
Is 8M the max you can clock the internal oscilator? i.e can I add an external oscillator?
What is the default config of the bootloader? 1Mhz or 8Mhz?

Just trying to figure out what changes I would have to make (if any at all).