Hi again,
Without a scheduling method, the project will suffer bad performance" ?
Is that to say, the word"performance" itself indicates "good performming", so "bad performance" is an awkward phrase?
No. It 's an awkward choice of words, because the word 'performance' usually relates to people. It is people who perform. In addition, the word 'suffer' also relates mainly to people. It is people who suffer. Finally, although 'suffer' can be used transitively, it is more often used intransitively: suffer from something.
If you put all these problems together, you get an awkward sentence.
Best wishes, Clive