No problem

Well, since Unity's about 10 times faster (Well at least on my PC) than A7, then it's probably 4 times faster than A8.
Unity wins, deeply.
Strange math.
A8 = 6 * A7
=>[1] A7 = 1/6 * A8
[2] Unity = 10 * A7
[1] in [2]=> Unity = 10/6 * A8 => Unity = 1.6666 * A8
Did you even test it with two identical shaders? Or are you just guessing?