1) It's natural the fire book of nukes are faster than the second nukes so yes lightning nuke 1 is faster casting than fire nuke 2.
2) No no increased range from what I can see.
3) No still same range, I think fire nuke 3 has the same range as the rest as well, haven't actually bothered to check.
Well in my opinion fire nuke 3 is pretty weak, lightning nuke 2 is a bit stronger than it but it's won't hurt you not to get lightning, you don't want to get mobbed and use it anyway
