The author's concern about prioritizing 'time performance' is that one might miss the deeper aspects of a work. The passage mentions the 'risk of overlooking the subtle expressions and emotional nuances that the creators intended.' This directly corresponds to the correct answer. The other options are not mentioned in the text: cost is not discussed, the issue is not about becoming unable to use time efficiently, and while it's mentioned as a trend among young people, the problem isn't about intergenerational understanding.