Assessing the performance of computers can be quite challenging.
assess /əs'es/ (assesses, assessing, assessed)
1.[verb] V n, V wh
When you assess a person, thing, or situation, you consider them in order to make a judgement about them.
当你assess 一个人、一件事情、或者一种形势， 你考虑他们，目的给予一个判断。
It would be a matter of assessing whether she was well enough to travel.
2.[Verb] V n
When you assess the amount of money that something is worth or should be paid, you calculate or estimate it.
Ask them to send you information on how to assess the value of your belongings...
The scale and intricacy of modern software systems, together with the wide range of performance improvement techniques employed by hardware designers, have made performance assessment much more difficult.