Answer:
substantial performance
Step-by-step explanation:
we know Nett Labs orders 30 computers with 2.6 GHz processor and 500 GB hard disk
but Nett Labs receive computer with 2 GHz processor and 500 GB hard disk
so we can say iDeal performance is substantial performance
because substantial performance is a contract that is here less than the given specification but here performance level is almost sufficient to avoid claim of contract
so as compare to this we can say it is substantial performance