Assuming each cond is about equally likely to be true as false, and assuming each cond takes one STU (significant time unit) then half the time the || will take 1 STU and half the time 2 STU, for overall expectation of 1.5 STU instead of 2.
If STU is a nanosecond, it probably doesn't matter.
If STU is a century, it probably does.
